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TiGERTiAN — Sun, 14 Oct 2007 08:55:00 GMT

今天写webwork+spring+hibernate的时候碰��C��(ji��n)�q�个问题

java.lang.NullPointerException
at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)

�q�个问题出得很莫名其妙，我在用find�Ҏ(gu��)��找数据的时候，如果数据库中不存在这条记录，那么代码一切正常，但如果存在相应记录就�?x��)抛��Z��面的异常�Q�搜�?ji��n)一圈，首先在国外的�|�站上找��C��个方�?br /> http://opensource.atlassian.com/projects/hibernate/browse/HHH-1365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel
主要说的是问题出在CGLib上面�Q�修正一下就可以�?ji��n)，下蝲中也�l�出�?ji��n)patch�Q�我没有试过�Q?br /> 我看��C��(ji��n)最后一条评论，直接更新CGlib�?.2beta��可以了(ji��n)。我试了(ji��n)一下，问题解决�?ji��n)�?br /> 在搜索过�E�中�Q�JavaEye有个帖子也提��C��(ji��n)�q�个问题�Q�解军_��法除�?ji��n)上面那个，�q�有��可以
讄��相关表的lazy="false"解决问题�Q�我没有��试�q�，大家可以看看�Q�各取所需�?br />

TiGERTiAN 2007-10-14 16:55 发表评论

TiGERTiAN — Sat, 13 Oct 2007 11:32:00 GMT

�q�句话大家很常见�?ji��n)，但是如果不注意的话，�q�句话会(x��)成�ؓ(f��)Java Web的梦��，我今天在做Webwork的时候，怎么都有问题�Q�无法提交到指定��面�Q�只�?x��)刷新当前表单页面，找�?ji��n)很久�Q�才惌��v来这句话指示�?ji��n)base�Q�所以无��Z��是提交表单还是webwork内部的�{向，都会(x��)出错�Q�有的时候提�C�找不到地址�Q�有的时候压根不提示。�ƈ且页面显�C�Z��?x��)出现问题。大家以后要注意�?ji��n)�?
�q�句话主要就是痿�?ji��n)让我们在写路径的时候统一一下，方便�q�移�?

TiGERTiAN 2007-10-13 19:32 发表评论

WebWork中的模型驱动问题注意

TiGERTiAN — Wed, 11 Apr 2007 10:30:00 GMT

//Example 1: This is wrong:
public class ViewHeadlineAction implements Action, ModelDriven {
Headline headline = new Headline();
public Object getModel() {
return this.headline ;
}
//
public String execute() {
headline = headlineFactory.findLatest();
return SUCCESS;
}
}
b//Example 2: This is correct:
public class ViewHeadlineAction implements Action, ModelDriven {
Headline headline = new Headline();
public Object getModel() {
return this.headline ;
}
//
public String execute() {
headlineFactory.updateToLatest(headline);
return SUCCESS;
}
}

Example 1 attempts to change the instance that getModel() returns. However,
because getModel() is called before execute() and before the object is pushed
onto the value stack, the reference that WebWork uses is the original instance, created
by new Headline(), not the instance loaded from the HeadlineFactory. The
second example resolves this issue by updating the existing instance rather than
having headline point to a new instance.

TiGERTiAN 2007-04-11 18:30 发表评论