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java.lang.NullPointerException: 	at xdoclet.modules.hibernate.HibernateTagsHandler.hasCompositeId_Impl(HibernateTagsHandler.java:529)	at xdoclet.modules.hibernate.HibernateTagsHandler.ifHasCompositeId(HibernateTagsHandler.java:140)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:494)	at xdoclet.template.TemplateEngine.invoke(TemplateEngine.java:635)	at xdoclet.template.TemplateEngine.invokeMethod(TemplateEngine.java:561)	at xdoclet.template.TemplateEngine.invokeBlockMethod(TemplateEngine.java:959)	at xdoclet.template.TemplateEngine.handleBlockTag(TemplateEngine.java:926)	at xdoclet.template.TemplateEngine.handleTag(TemplateEngine.java:466)	at xdoclet.template.TemplateEngine.generate(TemplateEngine.java:347)	at xdoclet.template.TemplateEngine.start(TemplateEngine.java:414)	at xdoclet.TemplateSubTask.startEngine(TemplateSubTask.java:560)	at xdoclet.TemplateSubTask.generateForClass(TemplateSubTask.java:767)	at xdoclet.TemplateSubTask.startProcessPerClass(TemplateSubTask.java:667)	at xdoclet.TemplateSubTask.startProcess(TemplateSubTask.java:594)	at xdoclet.XmlSubTask.startProcess(XmlSubTask.java:198)	at xdoclet.modules.hibernate.HibernateSubTask.execute(HibernateSubTask.java:123)	at xdoclet.XDocletMain.start(XDocletMain.java:48)	at xdoclet.DocletTask.start(DocletTask.java:464)	at xjavadoc.ant.XJavadocTask.execute(XJavadocTask.java:110)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:269)	at org.apache.tools.ant.Task.perform(Task.java:364)	at org.apache.tools.ant.Target.execute(Target.java:301)	at org.apache.tools.ant.Target.performTasks(Target.java:328)	at org.apache.tools.ant.Project.executeTarget(Project.java:1215)	at org.apache.tools.ant.Project.executeTargets(Project.java:1063)	at org.apache.tools.ant.Main.runBuild(Main.java:632)	at org.apache.tools.ant.Main.startAnt(Main.java:183)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:197)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:56)