JAXB在JDK1.6中的解决方案(但最后我没有成功,所以我重装成JDK1.5来实现)

How To Fix LinkageError when using JAXB with JDK 1.6

If you run across an error like this when trying to use JAXB:

java.lang.LinkageError: JAXB 2.0 API is being loaded from the bootstrap classloader, but this RI
(from jar:file:/somedirectory/jaxb-impl.jar!/com/sun/xml/bind/v2/model/impl/ModelBuilder.class) needs 2.1 API. Use the endorsed directory mechanism to place jaxb-api.jar in the bootstrap classloader. (See http://java.sun.com/j2se/1.5.0/docs/guide/standards/ )

It's actually a very simple fix, but painful enough to warrant a post. Put the jaxb-api.jar that you're trying to use into JDK_HOME/jre/lib/endorsed. If the endorsed directory doesn't exist, make it. This is apparently only a problem with JDK 1.6, not with JDK 1.5.

我用 JDK1.6 的方法 ( 使用的是 jboss5.0 里的 jaxb-api) 解决不了 , 后来再装了 1.5 后问题解决

 

 

7.1.2. Using JAXB 2.1 with JavaSE 6

JavaSE 6 comes with JAXB 2.0 API in rt.jar . Therefore, using JAXB 2.1 with JavaSE 6 requires one to override a portion of rt.jar with the new API. There are several ways to do this:

1. Place the 2.1 jaxb-api.jar into $JRE_HOME/lib/endorsed . This essentially makes your JRE to "JRE 6 + JAXB 2.1". This won't affect any other applications that use this JRE, and it's easy. On the other hand, in various scenarios you may not be able to alter the JRE.
2. Use the system property java.endorsed.dirs when you launch your application, and have it point to the directory that contains the 2.1 jaxb-api.jar . This allows you use use JAXB 2.1 without modifying the JRE. Make sure not to include any other JAXB RI jar files (such as jsr173-api.jar or jaxb-impl.jar .)
3. Implement a custom ClassLoader and block delegation to javax.xml.bind package, so that code running inside this class loader will load the JAXB API from elsewhere. This is a very advanced approach.

No matter which approach you take, make sure not to include jar files other than jaxb-api.jar . Doing so, for example including jaxb-xjc.jar , may result in classloading related errors such as "taskdef A class needed by class com.sun.tools.xjc.XJCTask cannot be found: org/apache/tools/ant/...."

See the endorsed directory mechanism for more details.

评论

4 楼 haiyupeter 2012-03-15  

jakic 写道

哈哈，我现在碰到这个问题，没想到找到海宇这里来了

3 楼 jakic 2012-03-11  

哈哈，我现在碰到这个问题，没想到找到海宇这里来了

2 楼 haiyupeter 2009-02-20  

qiujy 写道

我也遇到同样的问题，JDK1.6按上面做法可以成功。但JBossAS必须下载使用jboss-5.0.0.GA-jdk6版本。这个问题搞了我几个小时，郁闷。

好，谢谢噢。。我会去试一下下的

1 楼 qiujy 2009-01-07  

我也遇到同样的问题，JDK1.6按上面做法可以成功。但JBossAS必须下载使用jboss-5.0.0.GA-jdk6版本。这个问题搞了我几个小时，郁闷。