java.lang.reflect.InvocationTargetException: This exception has no message.

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java.lang.reflect.InvocationTargetException:
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at xdoclet.ConfigParamIntrospector.fillConfigParamsHashMapUsingReflectionFor(ConfigParamIntrospector.java:187)
at xdoclet.ConfigParamIntrospector.fillConfigParamsFor(ConfigParamIntrospector.java:113)
at xdoclet.DocletTask.getConfigParams(DocletTask.java:449)
at xdoclet.DocletTask.createContext(DocletTask.java:622)
at xdoclet.DocletTask.validateSubTasks(DocletTask.java:524)
at xdoclet.DocletTask.validateOptions(DocletTask.java:498)
at xdoclet.modules.ejb.EjbDocletTask.validateOptions(EjbDocletTask.java:81)
at xjavadoc.ant.XJavadocTask.execute(XJavadocTask.java:89)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
at org.apache.tools.ant.Main.runBuild(Main.java:698)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)

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