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:
- 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.
- 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 .)
- 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.
jdk6update12也可解決