本文档提供了将JAXB 2.0应用程序迁移到JavaSE 6并使用JAXB 2.1 API的方法。由于JavaSE 6自带JAXB 2.0 API，因此需要通过几种方式覆盖部分rt.jar文件来实现升级。具体方法包括修改JRE的endorsed目录、启动应用时指定java.endorsed.dirs系统属性指向新API或者实现自定义的ClassLoader等。
https://jaxb.dev.java.net/guide/Migrating_JAXB_2_0_applications_to_JavaSE_6.html
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.
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.
扫一扫
8431
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
