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glassfish下的Eclipse的wtp插�g的server runtime library问题

wilesun — Wed, 14 Aug 2013 01:27:00 GMT

See the thread GlassFish Tools does not provide a Server Runtime for Java Build Path in the Oracle forum.

Summary: They no longer provide a "Server Runtime" for plain Java projects. Instead, the project needs to be a faceted project and have a target runtime.

To configure this, do the following:

Go to the project properties > Project Facets
If necessary, click on Convert to faceted form...
In the Runtimes tab, select GlassFish 3.1

In case you need to export the GlassFish libraries to dependent projects, also do the following:

In Project Facets properties, select Utility Module and click Apply
In Java Build Path > Order and Export, select GlassFish System Libraries

见：(x��)http://stackoverflow.com/questions/17204096/glassfish-server-library-not-available-in-eclipse-kepler

wilesun 2013-08-14 09:27 发表评论

wilesun — Tue, 30 Jul 2013 05:59:00 GMT

��单的��试代码如下:
旉��?
StringBuilder 346887ns
MessageFormat 2956450ns
看来StringBuilder快了(ji��n)一个数量��Q�因此还是用StringBuilder�?br />

1 String str[] = { "11111", "222222222", "333333333333", "444444444444444444444444444" };
2         long l = System.nanoTime();
3         for (int i = 0; i < 100; i++) {
4             String c = new StringBuilder(str[0]).append(str[1]).append(str[2]).append(str[3]).toString();
5         }
6         System.out.println(System.nanoTime() - l);
7
8         MessageFormat format = new MessageFormat("{0}{1}{2}{3}");
9         l = System.nanoTime();
10         for (int i = 0; i < 100; i++) {
11             String c = format.format(str);
12         }
13         System.out.println(System.nanoTime() - l);

wilesun 2013-07-30 13:59 发表评论

Configuring Oracle for XA

wilesun — Fri, 26 Jul 2013 01:45:00 GMT

Configuring Oracle for XA

Oracle 10.2.0.3 and lower
Oracle 10.2.0.4, 11g and higher

Oracle 10.2.0.3 and lower

NOTE: this tip was written with Oracle DBMS version 10.2.0.2.0

How can you know if your Oracle server is correctly configured for XA?

The simplest and usually the most effective way is the following:

logon to SQLPlus (or use another tool if you like); make sure to use the user/password that you are using for your application
execute the query: select * from SYS.DBA_PENDING_TRANSACTIONS;

If this works then XA is configured.

If not then you should do one or all of the following:

run the oracle scripts 'initxa.sql' and 'xaview.sql' (or ask your DBA to do this for you).
ask your DBA to grant select rights (to your user) on SYS.DBA_PENDING_TRANSACTIONS
for the driver ojdbc14.jar, you also need execute rights on SYS.DBMS_SYSTEM

The last step is NOT needed for the older (JDK 1.2) drivers in classes12.jar

Oracle 10.2.0.4, 11g and higher

For Oracle 10.2.0.4 and up, you no longer need execute rights on SYS.DBMS_SYSTEM. This was fixed in Oracle 10.2.0.4 (BUG 5945463).

Make sure you are also using client driver ojdbc14 version 10.2.0.4 and up.

wilesun 2013-07-26 09:45 发表评论

FWK005 parse may not be called while parsing.

wilesun — Wed, 09 May 2012 09:18:00 GMT

最�q�在使用javax.xml.parsers.DocumentBuilder解析xml文�g的时候偶��?d��ng)�?x��)出错�Q?/p>

org.xml.sax.SAXException: FWK005 parse may not be called while parsing.
        at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:263)
        at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)
        at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:208)

跟踪�?ji��n)一下代码，发现�q�个异常是在com.sun.org.apache.xerces.internal.parsers.DTDConfiguration.parse(DTDConfiguration.java:546)抛出来的。该�D�代码结构如下：(x��)

if(fParseInProgress) {
throw new XNIException("FWK005 parse may not be called while parsing.");
}

fParseInProgress = true;

// 解析xml文�g

finally {
fParseInProgress = false;
}

从程序逻辑来看�Q�如果当前DocumentBuilder对象正在转换文档�Q�此时再�ơ请求�{换文档，那么直接抛出XNIException(“FWK005 parse may not be called while parsing.”);异常�?/p>

�q�个问题也比较好解决�Q�一�U�是对�{换xml文档的方法，增加synchronized关键字，�q�样子不�?x��)有两个�U�程同时讉K��Ҏ(gu��)��?/p>

�q�有一�U�方法是创徏一个DocumentBuilder�c�d��的ThreadLocal变量�Q�这样子每个�U�程都拥有自��q��DocumentBuilder对象�Q�能够同时�{换多个xml文�g。代码如下：(x��)

private static ThreadLocal docBuildeIns = new ThreadLocal() {
    protected DocumentBuilder initialValue() {
        try {
            return DocumentBuilderFactory.newInstance().newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            String msg = "DocumentBuilder 对象初始化失败！";
            log.error(msg, e);
            throw new IllegalStateException(msg, e);
        }
    }
};

wilesun 2012-05-09 17:18 发表评论

js也走JSP,�q�且可以中js文�g中��用EL

wilesun — Mon, 26 Mar 2012 11:00:00 GMT

JS Configuration

/impl/pages/*

false

UTF-8

false

true

wilesun 2012-03-26 19:00 发表评论

java动态创建Enum

wilesun — Wed, 19 Aug 2009 01:07:00 GMT

public class DayFactory {
    static {
        try {
            Constructor con = Day.class.getDeclaredConstructors()[0];
            Method[] methods = con.getClass().getDeclaredMethods();
            for (Method m : methods) {
                if (m.getName().equals("acquireConstructorAccessor")) {
                    m.setAccessible(true);
                    m.invoke(con, new Object[0]);
                }
            }
            Field[] fields = con.getClass().getDeclaredFields();
            Object ca = null;
            for (Field f : fields) {
                if (f.getName().equals("constructorAccessor")) {
                    f.setAccessible(true);
                    ca = f.get(con);
                }
            }
            Method m = ca.getClass().getMethod("newInstance", new Class[] { Object[].class });
            m.setAccessible(true);
            Day v = (Day) m.invoke(ca, new Object[] { new Object[] { "VACATION", Integer.MAX_VALUE } });
            System.out.println(v.getClass() + ":" + v.name() + ":" + v.ordinal());
            for(Day day:Day.values()) {
                System.out.println(day);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public static void say() {
    }

    @Test
    public void ddd() {
        DayFactory.say();
    }

wilesun 2009-08-19 09:07 发表评论

PowerDesigner不让code name同步改变

wilesun — Wed, 05 Aug 2009 09:18:00 GMT

PowerDesigner中，但修改了(ji��n)某个字段�?span class="hilite3">name�Q�其code也跟着修改�Q�这个问题很讨厌�Q�因��Z��般来��_(d��)��name是中文的�Q?span class="hilite2">code是字�D�名�?
解决�Ҏ(gu��)��如下�Q?
1、选择Tools->GeneralOptions...菜单�Q�出现General Options对话框�?
2、从Category中选择Dialog��V�?
3、取消右�?#8220;Name to Code mirroring”复选框�?

wilesun 2009-08-05 17:18 发表评论

wilesun — Wed, 07 Jan 2009 04:32:00 GMT

使用�q�c++的�h都知道在c++的类中有�?r��n)态属性及(qi��ng)�?r��n)态方�?为程序设计带来很多方�?那么在Delphi中静(r��n)态属性及(qi��ng)�?r��n)态方法是怎么实现的呢?��L(f��ng)��下面的实�?

unit Unit2;

interface

type
  TMyClass = Class
  public
    {�?r��n)态过�E?讄��?r��n)态属性的值}
    class procedure SetStaticMemberValue(AString: string);
    {�?r��n)态函�?��d��?r��n)态属性的值}
    class function GetStaticMemberValue: string;
  end;

implementation
{在此声明�?r��n)态属�?�q�一点与c++有很大的不同}
var
  AStaticMember: string;

class function TMyClass.GetStaticMemberValue: string;
begin
  Result := AStaticMember;
end;

class procedure TMyClass.SetStaticMemberValue(AString: string);
begin
  AStaticMember := AString;
end;

end.

    那么在TMyClass中声明的属性及(qi��ng)�Ҏ(gu��)��是否是静(r��n)态属性或�?r��n)态方法呢?��L(f��ng)��下面的实�?

...
uses unit2
...

procedure TForm1.Button2Click(Sender: TObject);
begin
  {不需声明TMyClass的实�?可直接设�|�及(qi��ng)��d��?r��n)态属性的值}
  TMyClass.SetStaticMemberValue('MyClass');
  showmessage(TMyClass.GetStaticMemberValue);
end;

wilesun 2009-01-07 12:32 发表评论

wilesun — Tue, 16 Dec 2008 04:51:00 GMT

�q�程桌面��出�q�接�?/li>

通过net use \\servername password /user:administrator shutdown -m \\servername -r -f�q�程重启服务�?/li>
通过mstsc

用mstsc /v:IP /console��q�接�?�?x��)�?如果0�?x��)话�?它将被踢�?/li>
mstsc参数的了(ji��n)解，可通过mstsc /?学习(f��n)一下�?
MSTSC [�Q�Connection File�Q�] [/v:�Q�sever[:port]�Q�] [/console] [/f[ullscreen]]
[/w:�Q�width�Q?nbsp;/h:�Q�height�Q�] | /Edit"ConnectionFile" | /Migrate | /?
�Q�Connection File�Q?nbsp;-- 指定�q�接�?nbsp;.rdp 文�g的名�U��?
/v:�Q�sever[:port]�Q?nbsp;-- 指定要连接到的终端服务器�?
/console -- �q�接到服务器的控制台�?x��)话�?
/f -- 以全屏模式启动客��L(f��ng)��?
/w: �Q�width�Q?nbsp;-- 指定�q�程桌面屏幕的宽度�?
/h:�Q�height�Q?nbsp;-- 指定�q�程桌面屏幕的亮度�?
/edit -- 打开指定�?nbsp;.rdp 文�g来编辑�?
/migrate -- ��客��L(f��ng)��q�接��理器创建的旧版�q�接文�g�q�移到新�?nbsp;.rdp �q�接文�g�?
/? -- 生成�q�个用法消息�?

wilesun 2008-12-16 12:51 发表评论

ORM-你在做领域Entity建模�?

wilesun — Mon, 15 Dec 2008 02:57:00 GMT

ORM-你在做领�?/span>Entity建模�?/span>?

ORM在我所接触�q�的��目或听说过的项目中70%以上�Ҏ(gu��)��没有领域实体对象建模�Q�有些项目是惛_��Q�但不知怎样才能做好�Q�，通常都是直接采用数据库物理模型来生成一个实体层。从�q�层面上�Ԍ��大家讨厌ORM是对的，因�ؓ(f��)�Q�大家其实只想需要一�?/span>JDBCTemplete��p��?ji��n)。说实话�Q�其�?/span>ORM本��n的精髓是在实体对象徏模这一�?/span>�?/span>

但要建好领域实体对象模型�Q�却实在是太难了(ji��n).如果先徏数据库的物理模，一般都�?x��)偷�?但如果一开始就从对象角度来做实体对象徏模，需要花费相当代�?最后通过OOM->PDM,来生成物理模�?span style="font-family: 宋体">�?/span>

wilesun 2008-12-15 10:57 发表评论