�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#26085;&#26412;&#19968;&#21306;&#35270;&#39057;&#44;&#57;&#55;&#33394;&#20262;&#22270;&#29255;&#57;&#55;&#32508;&#21512;&#24433;&#38498;&#44;&#25104;&#20154;&#33258;&#25293;&#35270;&#39057;</title><link>http://www.aygfsteel.com/xiaomage234/category/55036.html</link><description>生命本就是一�ơ凄���的漂流�Q�记忆中放不下的�Q�永�q�是孩提时代的那一份浪漫与�U�真�Q?/description><language>zh-cn</language><lastBuildDate>Tue, 17 May 2016 07:25:21 GMT</lastBuildDate><pubDate>Tue, 17 May 2016 07:25:21 GMT</pubDate><ttl>60</ttl><item><title>dubbo中的那些“坑"(3)-netty4-rpc�|�络接口中的高�ƈ发的bug</title><link>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430556.html</link><dc:creator>���马�?/dc:creator><author>���马�?/author><pubDate>Tue, 17 May 2016 07:25:00 GMT</pubDate><guid>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430556.html</guid><wfw:comment>http://www.aygfsteel.com/xiaomage234/comments/430556.html</wfw:comment><comments>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430556.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/xiaomage234/comments/commentRss/430556.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/xiaomage234/services/trackbacks/430556.html</trackback:ping><description><![CDATA[<h1><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">在几个月前改造dubbo�Ӟ��netty4已经�E�_��很久了，一时手痒，按照netty3-rpc的源码克隆了一套netty4�Q�在修正了大量的包、类型不同之后，基本保持了netty3的风��|���q�发量小或者数据包很小�Ӟ��一切都很ok, 在进行大�q�发���试�Ӟ���l�果和netty3完全不同�Q�基本用惨不忍睹来�Ş宏V��由于当时急于开发php客户端，���把netty4-rpc当做一个失败的�l��g存档��h���Q?nbsp;前几天php-dubbo开发基本完成之后，�q�回�q�来思考netty4-rpc的问题，�l�过仔细分析数据包的解析�q�程�Q�单步跟�t�源�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">NettyCodecAdapter, TelnetCodec, ExchangeCoedec�Q�发现ByteBuf的缓冲区�?024,当数据超�q?024�Ӟ��会调用多�ơDecoder.messageReceived函数�Q�第一�ơ分析dubbo的协议头�Ӟ��是正���的�Q�第二次之后数据���错误了�Q�然后dubbo内部�~�冲区的数据���来���长�Q�但是仍然分析不��C��个完整的dubbo数据�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">因此�ȝ��netty4的源码，发现AbstractNioByteChannel中有�|�络数据接收的代码时�q�么处理ByteBuf�?br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">&nbsp; ByteBuf byteBuf = null;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int messages = 0;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boolean close = false;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int totalReadAmount = 0;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; boolean readPendingReset = false;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; do {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; byteBuf = allocHandle.allocate(allocator);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int writable = byteBuf.writableBytes();<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int localReadAmount = doReadBytes(byteBuf);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (localReadAmount &lt;= 0) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // not was read release the buffer<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span style="padding: 0px; margin: 0px; background-color: #ff0000;"><strong style="padding: 0px; margin: 0px;">&nbsp;byteBuf.release();</strong></span><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; close = localReadAmount &lt; 0;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; break;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (!readPendingReset) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; readPendingReset = true;<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; setReadPending(false);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pipeline.fireChannelRead(byteBuf);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; byteBuf = null;</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">看见没，内核是需要ByteBuf.release的，�l�箋通过byteBuf的一个实现PooledByteBuf分析源码�Q�原来是实现了一个基于简单计数应用计数的循环使用的缓冲区�Q�一旦计数变�?�Q�该�~�冲�����归还到netty4内核�Q�被后面的数据读取线�E�重��C���?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">而我们InternalDecoder的代码�ؓ</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; message = com.alibaba.dubbo.remoting.buffer.ChannelBuffers.wrappedBuffer(<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; input.toByteBuffer());</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">直接引用了ByteBuf.toByteBuffer�Q����l�查看源码UnpooledHeapByteBuf,&nbsp;其toByteBuffer实际是对内部数据�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">一个nio���装而已�Q�因此，使用上述函数�Ӟ����D��dubbo的decode保存了一个某一个ByteBuffer的内部数据，但是虽有�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">buffer被归�q�到netty4�~�冲��Z��被��@环引用，下一�ơ可能被其他��d���U�程重新改写数据�Q�因此，高�ƈ发下当缓冲区被重复��用时�Q�bytebuf���由于计数问题不断被使用�Q�而解码器中缺��d���{�待�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">解决�Ҏ��</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">1.通过byteBuf的retain和release函数保证计数的有效性，通过�E�序例外或者缓冲区被��用完成时候归�q�ByteBuf到netty4内核</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">2.拯���数据到dubbo的缓冲区�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">思考：<br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; font-weight: normal; background-color: #ffffff;">netty3&nbsp;是否也有该问题呢�Q�？�Q?/p></h1><img src ="http://www.aygfsteel.com/xiaomage234/aggbug/430556.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/xiaomage234/" target="_blank">���马�?/a> 2016-05-17 15:25 <a href="http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430556.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>dubbo中的那些“坑�?1) - 关于MINA传输协议的bug定位及修�?/title><link>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430554.html</link><dc:creator>���马�?/dc:creator><author>���马�?/author><pubDate>Tue, 17 May 2016 07:24:00 GMT</pubDate><guid>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430554.html</guid><wfw:comment>http://www.aygfsteel.com/xiaomage234/comments/430554.html</wfw:comment><comments>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430554.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/xiaomage234/comments/commentRss/430554.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/xiaomage234/services/trackbacks/430554.html</trackback:ping><description><![CDATA[from:http://my.oschina.net/aruan/blog/351594<br /><br /><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">同事刘阳使用dubbo服务器中配置mina作�ؓ�|�络传输层，发现大�ƈ发情况下�Q�解码发生如下异�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;"><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">014-12-01 18:00:44,652 [DubboServerHandler-10.1.19.13:20880-thread-164] WARN&nbsp; alibaba.dubbo.remoting.exchange.codec.ExchangeCodec (ExchangeCodec.java:596) -&nbsp; [DUBBO] Fail to encode response: Response [id=8119, version=2.0.0, status=40, event=false, error=Fail to decode request due to: RpcInvocation [methodName=null, parameterTypes=null, arguments=null, attachments={input=242}, headers=null], result=null], send bad_response info instead, cause: null, dubbo version: 2.5.5, current host: 127.0.0.1</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">java.lang.NullPointerException</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.encodeResponseData(DubboCodec.java:301)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.encodeResponse(ExchangeCodec.java:560)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:104)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:39)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at com.alibaba.dubbo.remoting.transport.mina.MinaCodecAdapter$InternalEncoder.encode(MinaCodecAdapter.java:79)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:214)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.AbstractIoFilterChain.callPreviousFilterWrite(AbstractIoFilterChain.java:361)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.AbstractIoFilterChain.access$1300(AbstractIoFilterChain.java:53)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.filterWrite(AbstractIoFilterChain.java:659)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.AbstractIoFilterChain$TailFilter.filterWrite(AbstractIoFilterChain.java:587)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.AbstractIoFilterChain.callPreviousFilterWrite(AbstractIoFilterChain.java:361)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.AbstractIoFilterChain.fireFilterWrite(AbstractIoFilterChain.java:355)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.transport.socket.nio.SocketSessionImpl.write0(SocketSessionImpl.java:166)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.BaseIoSession.write(BaseIoSession.java:177)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at org.apache.mina.common.support.BaseIoSession.write(BaseIoSession.java:168)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at com.alibaba.dubbo.remoting.transport.mina.MinaChannel.send(MinaChannel.java:95)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at com.alibaba.dubbo.remoting.transport.AbstractPeer.send(AbstractPeer.java:51)</span><br style="padding: 0px; margin: 0px;" /><span style="padding: 0px; margin: 0px; font-family: 微��Y雅黑; font-size: 14px; letter-spacing: normal; line-height: 21px; widows: auto;">&nbsp;&nbsp; &nbsp;at&nbsp;<br style="padding: 0px; margin: 0px;" /></span></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">�l�过�Ҏ��netty3和netty4作�ؓ传输层，却都没有发现�c�M��的问题�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">首先排除不是mina本��n的问题，mina也没有爆出有�q�个问题�Q�初步判断dubbo在��用mina时机制有问题</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">�l�过�Ҏ��发现</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">1.netty是�ؓ每一个channel分配了一个NettyCodecAdapter, mina���实在服务器监听前配�|�了MinaCodecAdapter</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">2.也就是说�Q�netty的每一个独立的通道的Codec(encoder/decoder�Q�是通道安全�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">3.mina的所有通道是共享相同的codec(encoder/decoder)的，因此�Q�解码器中的实例数据旉���channel安全�?br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">因此解码器中与netty相同的解码器的缓冲数据算法在�q�发情况下将会��生数据覆盖问题�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">4.解决�Ҏ��<br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.配置acceptor的监听器</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">codecAdapter = new MinaCodecAdapter(getCodec(), getUrl(), this);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; acceptor.getFilterChain().addLast("codec", new ProtocolCodecFilter(codecAdapter));</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">&nbsp;&nbsp;&nbsp;&nbsp;acceptor.addListener(new IoServiceListener(){<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;@Override<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;public void serviceActivated(IoService service,<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;SocketAddress serviceAddress, IoHandler handler,<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;IoServiceConfig config) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;@Override<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;public void serviceDeactivated(IoService service,<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;SocketAddress serviceAddress, IoHandler handler,<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;IoServiceConfig config) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;@Override<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;public void sessionCreated(IoSession session) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;codecAdapter.sessionCreated(session);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;@Override<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;public void sessionDestroyed(IoSession session) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;codecAdapter.sessionDestroyed(session);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; });</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">&nbsp;&nbsp;&nbsp;&nbsp;2.监听session的create和destroy事�g�Q�传递到decoder中，decoder中，通过session和buffer的键值对保存对不同通道的数据的�~�存�Q?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">private Map&lt;IoSession, ChannelBuffer&gt; buffers = new ConcurrentHashMap&lt;IoSession, ChannelBuffer&gt;();<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;// ChannelBuffers.EMPTY_BUFFER;<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;public void sessionCreated(IoSession session) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;buffers.put(session, ChannelBuffers.EMPTY_BUFFER);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;public void sessionDestroyed(IoSession session) {<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;buffers.remove(session);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;}<br style="padding: 0px; margin: 0px;" /><br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">&nbsp;&nbsp;&nbsp; 3.解码旉���过session获得当前channel的数�?/p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">ChannelBuffer buffer = buffers.get(session);<br style="padding: 0px; margin: 0px;" />&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;if(buffer == null) return;</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;"><br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">�l�过���试�Q�问题得以解�?/p><img src ="http://www.aygfsteel.com/xiaomage234/aggbug/430554.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/xiaomage234/" target="_blank">���马�?/a> 2016-05-17 15:24 <a href="http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430554.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>dubbo中的那些“坑"(2)-hessian-lite字符串数据定义改�q?/title><link>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430555.html</link><dc:creator>���马�?/dc:creator><author>���马�?/author><pubDate>Tue, 17 May 2016 07:24:00 GMT</pubDate><guid>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430555.html</guid><wfw:comment>http://www.aygfsteel.com/xiaomage234/comments/430555.html</wfw:comment><comments>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430555.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/xiaomage234/comments/commentRss/430555.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/xiaomage234/services/trackbacks/430555.html</trackback:ping><description><![CDATA[<p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">其实�q�个不算是一个坑�Q�阿里实现的字符串协议挺好的�Q�但是由于我个�h的强�q�症和在�~�写php客户端过�E�中对字�W�串的输出和解析感觉很别扭，���其是字�W�串数据很大�Ӟ��必须一个字节一个字节的判断处理�Q�让我很郁闷�Q�明昑֒�我当�q�编写汇�~�时的哪�U�精致不�W�。体现在两个斚w��</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">1.字符串的格式定义�?nbsp;字母S或者R +&nbsp;两个字节的数据长度（MSB�Q?&nbsp;utf8格式的字节数�l�，S表示最后一个块�Q�上面那个长度是unicode&nbsp;<br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">字符串的长度�Q�不是自己数�l�的长度�Q�即"中国"�q�个词，长度�?,utf8表示的字节数�l�确�?个字�?br style="padding: 0px; margin: 0px;" /></p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">2.我的php客户端是用c混合c++�~�写的php扩展�Q�输出字�W�串旉���先调用libmbfl库计���unicode字符串的长度�Q�然后输出utf8数据,因�ؓ在php中，我们默认采用utf8格式�Q�字�W�串zval已经是utf8格式了，�q�且附带一个utf8长度的整敎ͼ�</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">3.��d��应答分析字符串时�Q�根据上面的长度�q�不知道该分配多���内存来接受整个字符�Ԍ��因�ؓ长度和utf8的字节长度根本没有关�p�，�q�有多个节时防止utf8字母被分配到多个不同的chunk上面</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">4.因此�Q�我们重新定义了一个字�W�串数据协议�Q?E +4字节UTF8字节长度�Q�MSB�Q? utf8表示一个完整的字符�Ԍ��4字节�Ӟ��表示的数据有2^31-1个utf8字节�Q�可以表�C�好几百兆的汉字�Q�够用了�Q�这��h��们可以��用c语言的memcpy函数�q�行快速数据拷贝和数据�~�冲区分配了</p><p style="padding: 0px; margin: 20px 0px; line-height: 28.8px; letter-spacing: 0.5px; font-size: 16px; word-wrap: break-word; word-break: break-all; font-family: 'Lantinghei SC', 'Open Sans', Arial, 'Hiragino Sans GB', 'Microsoft YaHei', STHeiti, 'WenQuanYi Micro Hei', SimSun, sans-serif; background-color: #ffffff;">5.�l�过���试�Q�大量字�W�串的数据传输性能能提�?%</p><img src ="http://www.aygfsteel.com/xiaomage234/aggbug/430555.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/xiaomage234/" target="_blank">���马�?/a> 2016-05-17 15:24 <a href="http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430555.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Hessian和Java反序列化问题���结</title><link>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430553.html</link><dc:creator>���马�?/dc:creator><author>���马�?/author><pubDate>Tue, 17 May 2016 07:24:00 GMT</pubDate><guid>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430553.html</guid><wfw:comment>http://www.aygfsteel.com/xiaomage234/comments/430553.html</wfw:comment><comments>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430553.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/xiaomage234/comments/commentRss/430553.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/xiaomage234/services/trackbacks/430553.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 摘要: from:http://hittyt.iteye.com/blog/1691772Hessian反序列化问题众所周知�Q�Hessian框架提供的序列化方式�Q�在性能上要优于Java自己的序列化方式。他���对象序列化�Q�生成的字节数组的数量要相对于Java自带的序列化方式要更����z�。目前公司的一个项目中�Q�有RPC调用的需要，�q�里我们使用了公司自��q��开源RPC框架Dubbo作�ؓ�q�程调用框架�Q�进行业务方法的调用�?..&nbsp;&nbsp;<a href='http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430553.html'>阅读全文</a><img src ="http://www.aygfsteel.com/xiaomage234/aggbug/430553.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.aygfsteel.com/xiaomage234/" target="_blank">���马�?/a> 2016-05-17 15:24 <a href="http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430553.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>�q�期hessian反序列化问题�ȝ��与ThreadPoolExecutor使用心得</title><link>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430552.html</link><dc:creator>���马�?/dc:creator><author>���马�?/author><pubDate>Tue, 17 May 2016 07:22:00 GMT</pubDate><guid>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430552.html</guid><wfw:comment>http://www.aygfsteel.com/xiaomage234/comments/430552.html</wfw:comment><comments>http://www.aygfsteel.com/xiaomage234/archive/2016/05/17/430552.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/xiaomage234/comments/commentRss/430552.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/xiaomage234/services/trackbacks/430552.html</trackback:ping><description><![CDATA[<div style="margin: 0px; border: 0px; font-stretch: inherit; font-size: 18.4px; line-height: 27.6px; font-family: 'PT Serif', Georgia, Times, 'Times New Roman', serif; vertical-align: baseline; color: #222222; background-color: #f8f8f8;"><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">from:<span style="font-size: 18.4px; line-height: 27.6px;">http://pfmiles.github.io/blog/recently-hessian-deserialize-problem-and-thread-pool-executor-experience/</span></p><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">最�q�工作中遇到一个诡异的问题�Q�别������E�调用我们的�pȝ��暴露的服务，同步调用�Q�底层��用hessian协议做序列化�Q?br />调用方系�l�报�I�指针，反序列化��p�|�Q?/p><pre style="margin-top: 0px; margin-bottom: 2.1em; padding: 0.8em 1em; border: 1px solid #05232b; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 13px; line-height: 1.45em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; box-shadow: rgba(0, 0, 0, 0.0588235) 0px 0px 10px; border-radius: 0.4em; color: #93a1a1; overflow: auto; background: url(&quot;/images/noise.png?1377770028&quot;) 0% 0% #002b36;"><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline;">2013-04-18 16:52:10,308 [AvatarRuleChargeService.java:74] [com.alibaba.itbu.billing.biz.adaptor.avatar.AvatarRuleChargeService] ERROR com.alibaba.itbu.billing.biz.adaptor.crm.ChargeProxy :: avatar charge sys error com.alibaba.dubbo.rpc.RpcException: Failed to invoke the method match in the service com.alibaba.china.ruleservice.RuleService. Tried 3 times of the providers [172.22.6.83:20980, 172.22.6.80:20980, 172.22.9.76:20980] (3/3) from the registry dubbo-reg1.hst.xyi.cn.alidc.net:9090 on the consumer 172.30.118.26 using the dubbo version 2.4.9. Last error is: Failed to invoke remote method: match, provider: dubbo://172.22.6.83:20980/com.alibaba.china.ruleservice.RuleService?anyhost=true&amp;application=billing&amp;check=false&amp;default.reference.filter=dragoon&amp;dubbo=2.4.9&amp;interface=com.alibaba.china.ruleservice.RuleService&amp;methods=match&amp;pid=18616&amp;revision=1.0-SNAPSHOT&amp;side=consumer&amp;timeout=5000&amp;timestamp=1366275108588&amp;version=1.0.0, cause: com.alibaba.com.caucho.hessian.io.HessianProtocolException: 'com.alibaba.china.ruleservice.RuleServiceImpl$DynamicPluginInvocationMatchedResult' could not be instantiated com.alibaba.com.caucho.hessian.io.HessianProtocolException: 'com.alibaba.china.ruleservice.RuleServiceImpl$DynamicPluginInvocationMatchedResult' could not be instantiated     at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:275)     at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:155)     at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:396)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2070)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2005)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1990)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1538)     at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:94)     at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:99)     at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:83)     at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:109)     at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:97)     at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:128)     at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:87)     at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:49)     at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:135)     at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)     at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)     at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)     at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)     at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)     at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349)     at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280)     at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200)     at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)     at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44)     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)     at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.reflect.InvocationTargetException     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)     at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:271)     ... 28 more Caused by: java.lang.NullPointerException     at com.alibaba.china.ruleservice.RuleServiceImpl$DynamicPluginInvocationMatchedResult.&lt;init&gt;(RuleServiceImpl.java:163)     ... 33 more      at com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:101)     at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:226)     at com.alibaba.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:72)     at com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:52)     at com.alibaba.dubbo.common.bytecode.proxy1.match(proxy1.java)     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)     at java.lang.reflect.Method.invoke(Method.java:597)     at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)     at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)     at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)     at com.alibaba.itbu.billing.framework.aop.OpenApiLogAspect.logExecuteTime(OpenApiLogAspect.java:38)     at sun.reflect.GeneratedMethodAccessor199.invoke(Unknown Source)     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)     at java.lang.reflect.Method.invoke(Method.java:597)     at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:627)     at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:616)     at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:64)     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)     at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)     at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)     at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)     at $Proxy107.match(Unknown Source)     at com.alibaba.itbu.billing.biz.adaptor.avatar.AvatarRuleChargeService.chargeByFactor(AvatarRuleChargeService.java:72)     at com.alibaba.itbu.billing.biz.charge.times.RuleChargeByTimesProcessor.getChargeResult(RuleChargeByTimesProcessor.java:62)     at com.alibaba.itbu.billing.biz.charge.times.ChargeByTimesProcessor.charge(ChargeByTimesProcessor.java:117)     at com.alibaba.itbu.billing.biz.task.ChargeByIncInstantTimesTask.charge(ChargeByIncInstantTimesTask.java:174)     at com.alibaba.itbu.billing.biz.task.ChargeByIncInstantTimesTask$1.run(ChargeByIncInstantTimesTask.java:109)     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)     at java.lang.Thread.run(Thread.java:662) Caused by: com.alibaba.dubbo.remoting.RemotingException: com.alibaba.com.caucho.hessian.io.HessianProtocolException: 'com.alibaba.china.ruleservice.RuleServiceImpl$DynamicPluginInvocationMatchedResult' could not be instantiated com.alibaba.com.caucho.hessian.io.HessianProtocolException: 'com.alibaba.china.ruleservice.RuleServiceImpl$DynamicPluginInvocationMatchedResult' could not be instantiated     at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:275)     at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:155)     at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:396)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2070)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2005)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1990)     at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1538)     at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:94)     at com.alibaba.dubbo.common.serialize.support.hessian.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:99)     at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:83)     at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:109)     at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:97)     at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:128)     at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:87)     at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:49)     at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:135)     at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:80)     at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)     at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)     at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:274)     at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:261)     at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:349)     at org.jboss.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:280)     at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:200)     at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)     at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44)     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)     at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.reflect.InvocationTargetException     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)     at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)     at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)     at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:271)     ... 28 more Caused by: java.lang.NullPointerException     at com.alibaba.china.ruleservice.RuleServiceImpl$DynamicPluginInvocationMatchedResult.&lt;init&gt;(RuleServiceImpl.java:163)     ... 33 more      at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.returnFromResponse(DefaultFuture.java:190)     at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:110)     at com.alibaba.dubbo.remoting.exchange.support.DefaultFuture.get(DefaultFuture.java:84)     at com.alibaba.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:96)     at com.alibaba.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:144)     at com.alibaba.dubbo.rpc.listener.ListenerInvokerWrapper.invoke(ListenerInvokerWrapper.java:74)     at com.alibaba.dubbo.monitor.dragoon.filter.DragoonFilter.invoke0(DragoonFilter.java:82)     at com.alibaba.dubbo.monitor.dragoon.filter.DragoonFilter.invoke(DragoonFilter.java:34)     at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)     at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:75)     at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)     at com.alibaba.dubbo.rpc.protocol.dubbo.filter.FutureFilter.invoke(FutureFilter.java:53)     at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)     at com.alibaba.dubbo.rpc.filter.ConsumerContextFilter.invoke(ConsumerContextFilter.java:48)     at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91)     at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53)     at com.alibaba.dubbo.rpc.cluster.support.FailoverClusterInvoker.doInvoke(FailoverClusterInvoker.java:77)     ... 32 more </code></pre><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">看到�q�个日志�W�一反映是觉�?code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">RuleServiceImpl.java:163</code>数据错误�Q�抛�I�指针，但检查那块代码发现那个地�Ҏ��本不可能抛空指针 &#8212;&#8212; 所有用到的变量都是<code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">new</code>出来的；<br />而且�Q�依据调用方提供的错误日志的抛出旉����Q�我在被调用方系�l�的所有机器的日志里查找了一遍，没有发现对应的服务端日志�Q�照理说服务端抛�I�指针，服务端也会有对应日志�Q�但没有��M���U�烦&#8230;</p><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">因此只好���d���?code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">JavaDeserializer.java:275</code>作检查，发现有这么一�D�：</p><pre style="margin-top: 0px; margin-bottom: 2.1em; padding: 0.8em 1em; border: 1px solid #05232b; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 13px; line-height: 1.45em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; box-shadow: rgba(0, 0, 0, 0.0588235) 0px 0px 10px; border-radius: 0.4em; color: #93a1a1; overflow: auto; background: url(&quot;/images/noise.png?1377770028&quot;) 0% 0% #002b36;"><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline;">  public JavaDeserializer(Class cl)   {     _type = cl;     _fieldMap = getFieldMap(cl);      _readResolve = getReadResolve(cl);      if (_readResolve != null) {       _readResolve.setAccessible(true);     }      Constructor []constructors = cl.getDeclaredConstructors();     long bestCost = Long.MAX_VALUE;      for (int i = 0; i &lt; constructors.length; i++) {       Class []param = constructors[i].getParameterTypes();       long cost = 0;        for (int j = 0; j &lt; param.length; j++) {     cost = 4 * cost;      if (Object.class.equals(param[j]))       cost += 1;     else if (String.class.equals(param[j]))       cost += 2;     else if (int.class.equals(param[j]))       cost += 3;     else if (long.class.equals(param[j]))       cost += 4;     else if (param[j].isPrimitive())       cost += 5;     else       cost += 6;       }        if (cost &lt; 0 || cost &gt; (1 &lt;&lt; 48))     cost = 1 &lt;&lt; 48;        cost += param.length &lt;&lt; 48;        if (cost &lt; bestCost) {         _constructor = constructors[i];         bestCost = cost;       }     }      if (_constructor != null) {       _constructor.setAccessible(true);       Class []params = _constructor.getParameterTypes();       _constructorArgs = new Object[params.length];       for (int i = 0; i &lt; params.length; i++) {         _constructorArgs[i] = getParamArg(params[i]);       }     }   } </code></pre><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">看完�q�段后，再结合远�E�调用的�q�回�l�果�c�d��恍然大悟�Q?br />上面�q�段代码�Q�是hessian在反序列化的时候，用于在被反序列化的类里面找一�?#8220;得分最�?#8221;的构造函敎ͼ�反序列化时会加以调用;<br />构造函数的&#8220;得分&#8221;规则大致是：参数���少得分���低�Q�参��C��数相同时�Q�参数类型越接近JDK内置�c�d��分越�?br />而我们的调用�q�回的类只有一个构造函敎ͼ�当然只有�q�个构造函��C��被选中<br />但是�Q�hessian反序列化调用被选中的构造函数时�Q�是�q�样来创造该构造函数需要的参数的：</p><pre style="margin-top: 0px; margin-bottom: 2.1em; padding: 0.8em 1em; border: 1px solid #05232b; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 13px; line-height: 1.45em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; box-shadow: rgba(0, 0, 0, 0.0588235) 0px 0px 10px; border-radius: 0.4em; color: #93a1a1; overflow: auto; background: url(&quot;/images/noise.png?1377770028&quot;) 0% 0% #002b36;"><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline;">protected static Object getParamArg(Class cl)   {     if (! cl.isPrimitive())       return null;     else if (boolean.class.equals(cl))       return Boolean.FALSE;     else if (byte.class.equals(cl))       return new Byte((byte) 0);     else if (short.class.equals(cl))       return new Short((short) 0);     else if (char.class.equals(cl))       return new Character((char) 0);     else if (int.class.equals(cl))       return new Integer(0);     else if (long.class.equals(cl))       return new Long(0);     else if (float.class.equals(cl))       return new Float(0);     else if (double.class.equals(cl))       return new Double(0);     else       throw new UnsupportedOperationException();   } </code></pre><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">可以看到�Q�如果参��C���?code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">primitive</code>�c�d���Q�会�?code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">null</code>代替�Q�但不��y的是我们的构造函数内部对该参数调用了一个方法，因此抛出了空指针&#8230;<br />也就是说�q�个�I�指针是抛在客户端反序列化的时候而不是服务端内部�Q�因此服务端当然找不到对应的错误日志了；<br />解决的办法也很简单：可以新增一个无参构造函�?无参构造函数肯�?#8220;得分&#8221;最低一定会被选中)�Q�或者修改代码保证�Q意参��Cؓ<code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">null</code>的时候都不会出问�?/p><hr style="margin-bottom: 0.2em;" /><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">下面�q�个问题更有意思，说的�?code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">ThreadPoolExecutor</code>�?code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">RejectedExecutionHandler</code>的��用：</p><pre style="margin-top: 0px; margin-bottom: 2.1em; padding: 0.8em 1em; border: 1px solid #05232b; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 13px; line-height: 1.45em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; box-shadow: rgba(0, 0, 0, 0.0588235) 0px 0px 10px; border-radius: 0.4em; color: #93a1a1; overflow: auto; background: url(&quot;/images/noise.png?1377770028&quot;) 0% 0% #002b36;"><code style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline;">threadPool = new ThreadPoolExecutor(5, maxThreadNum, 5, TimeUnit.MINUTES, new SynchronousQueue&lt;Runnable&gt;(), tf,             new RejectedExecutionHandler() {                 public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {                     logger.error("Ep thread pool exhausted, epId: " + id + "!!");                     r.run();                 }             }); </code></pre><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">�q�个代码是说�Q�当我这个ThreadPool不够用，又不能再新增�U�程数的时候，��p��用方�U�程自己来执行这�?code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">Runnable</code>��d��&#8230;<br />本来�q�看上去没什么问题，问题出在�q�个<code style="margin: -1px 0px; padding: 0px 0.3em; border: 1px solid #dddddd; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.8em; line-height: 1.5em; font-family: Menlo, Monaco, 'Andale Mono', 'lucida console', 'Courier New', monospace; vertical-align: baseline; display: inline-block; color: #555555; border-radius: 0.4em; background: #ffffff;">Runnable</code>本��n的实��C�� &#8212;&#8212; 它内部将执行它的�U�程block��C��一个blocking queue上面�Q�当调用方主�U�程亲自来执行它�Ӟ��使得�ȝ���E�再也回不去做它自己该做的事情了�Q�因此会出大问题&#8230;<br />所以这么看来，&#8220;当线�E�池不够用就让调用方�U�程自己来干&#8221;的这个策略在实际使用时要非常谨慎</p><p style="margin: 0px 0px 1.5em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">�q�个问题是通过一个方便的thread dump分析工具:&nbsp;<a  style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; color: #751590; transition: color 0.3s; white-space: pre-wrap; word-wrap: break-word;">tda</a>来查扄����Q�因为出问题的这个应用是个多�U�程�E�序�Q�有1600多个帔R���U�程�Q�thread dump非常之大�Q�肉眼直接看很不方便�Q�但tda能将thread dump变得更友好易读，方便排查问题�Q�在此推荐一�?/p></div><footer style="margin: 2em 0px 0px; padding: 0px 0px 2.5em; border: 0px; font-stretch: inherit; font-size: 18.4px; line-height: 27.6px; font-family: 'PT Sans', 'Helvetica Neue', Arial, sans-serif; vertical-align: baseline; color: #222222; background-color: #f8f8f8;"><p style="margin: 0px 0px 0.8em; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: 0.85em; line-height: inherit; font-family: inherit; vertical-align: baseline; clear: both; overflow: hidden;"><span author=""  vcard"="" style="margin: 0px; padding: 0px; border: 0px; font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline;">Posted by&nbsp;<span style="margin: 0px; padding: 0px; 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