Hudson 加载 findbugs插件 Failed to load plugin instance for: analysis-core 报错解决

用Hudson加载findbugs插件，一开始总是会报如下错误：

SEVERE: Failed Loading plugin analysis-core

hudson.util.IOException2: Failed to load plugin instance for: analysis-core

at org.hudsonci.inject.internal.plugin.SmoothiePluginStrategy.load(SmoothiePluginStrategy.java:193)

at org.hudsonci.inject.internal.plugin.DelegatingPluginStrategy.load(DelegatingPluginStrategy.java:72)

at hudson.PluginManager$2$1$1.run(PluginManager.java:297)

at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)

at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)

at hudson.model.Hudson$4.runTask(Hudson.java:698)

at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)

at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

at java.lang.Thread.run(Thread.java:619)

Caused by: java.lang.LinkageError: loader (instance of org/hudsonci/inject/internal/plugin/PluginClassLoader): attempted duplicate class definition for name: "org/apache/xerces/parsers/SAXParser"

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:621)

at java.lang.ClassLoader.defineClass(ClassLoader.java:466)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:122)

最重要的信息就是：attempted duplicate class definition for name: "org/apache/xerces/parsers/SAXParser"

说明这个类重复加载了，因此解决方法就是删除重复的该类jar包。

我的解决方法是删除hudson plugin目录中maven-plugin/lib下的xercesImpl-2.9.1.jar.

然后重启Tomcat，插件加载成功。