[platform-dev] Plugin ClassLoader Difficulties

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[platform-dev] Plugin ClassLoader Difficulties
From: Chris McGee <cbmcgee@xxxxxxxxxx>
Date: Fri, 20 Feb 2004 13:18:31 -0500
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Hi All,

I'm having a very strange problem with the Plugin ClassLoader when
executing my own custom Ant task. My environment is eclipse 3.0 M6 on
Win2k.

Basically, I have an Ant task that I have created that makes use of a
plugin that I have developed. My plugin has dependencies on other plugins
and I hope to make use of these other plugins.

What I have done is to place my Ant task in a separate jar that is no way
referenced by my plugin. This is suggested by the Eclipse Ant
documentation. My Ant task has references to classes in my plugin and when
I compile the class, I specify my plugin directory as part of the classpath
in order to resolve the references to classes in my plugin. I give the ant
task jar to Ant through the ant task extension point so that it can load
the class when it is needed.

The above approach seems to work well in simple cases where I do not
attempt to access classes beyond my ant task class. I can complete simple
tasks with no problem. When I access classes from my plugin, exceptions are
thrown sometime. I have been able to access certain classes and perform
static method invokations on them with no problems. The problems seem to
occur when I actually try to instantiate a class.

Here is an example stacktrace:

[diagram] org.osgi.framework.BundleException: Exception in
org.eclipse.core.internal.compatibility.PluginActivator.start()
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.startActivator(BundleContext.java:1071)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.start(BundleContext.java:991)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:403)
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.start(Bundle.java:312)
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.requireClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findRequiredClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled
Code))
[diagram] at java.lang.ClassLoader.defineClass0(Native Method)
[diagram] at java.lang.ClassLoader.defineClass(ClassLoader.java(Compiled
Code))
[diagram] at
org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.defineClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader.findClassImpl(DefaultClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader.findClass(DefaultClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.findLocalClass(BundleClassLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.loadClass(Bundle.java(Compiled
 Code))
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.internalDoPluginActivation(PluginDescriptor.java:471)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.doPluginActivation(PluginDescriptor.java:438)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.getPlugin(PluginDescriptor.java:406)
[diagram] at
org.eclipse.core.internal.compatibility.PluginActivator.start(PluginActivator.java:48)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext$1.run(BundleContext.java:1054)
[diagram] at java.security.AccessController.doPrivileged1(Native Method)
[diagram] at
java.security.AccessController.doPrivileged(AccessController.java:350)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.startActivator(BundleContext.java:1050)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.start(BundleContext.java:991)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:403)
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.start(Bundle.java:312)
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.requireClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findRequiredClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled
Code))
[diagram] at someplugin.someOperation.<init>(someOperation.java:47)
[diagram] at ... CustomTask.execute(Unknown Source)
[diagram] at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[diagram] at org.apache.tools.ant.Task.perform(Task.java:401)
[diagram] at org.apache.tools.ant.Target.execute(Target.java:338)
[diagram] at org.apache.tools.ant.Target.performTasks(Target.java:365)
[diagram] at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:661)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:438)
[diagram] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:84)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[diagram] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled
 Code))
[diagram] at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
[diagram] at org.eclipse.ant.core.AntRunner.run(AntRunner.java:342)
[diagram] at
org.eclipse.ant.internal.ui.launchConfigurations.AntLaunchDelegate.launch(AntLaunchDelegate.java:225)
[diagram] at
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:157)
[diagram] at
org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:778)
[diagram] at
org.eclipse.debug.ui.DebugUITools.buildAndLaunch(DebugUITools.java:628)
[diagram] at org.eclipse.debug.ui.DebugUITools$2.run(DebugUITools.java:536)
[diagram] at
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
[diagram] java.lang.ExceptionInInitializerError
[diagram] at some.plugin.somePlugin.<clinit>(somePlugin.java:49)
[diagram] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
[diagram] at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:79)
[diagram] at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java(Compiled
 Code))
[diagram] at
java.lang.reflect.Constructor.newInstance(Constructor.java(Compiled Code))
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.internalDoPluginActivation(PluginDescriptor.java:488)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.doPluginActivation(PluginDescriptor.java:438)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.getPlugin(PluginDescriptor.java:406)
[diagram] at
org.eclipse.core.internal.compatibility.PluginActivator.start(PluginActivator.java:48)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext$1.run(BundleContext.java:1054)
[diagram] at java.security.AccessController.doPrivileged1(Native Method)
[diagram] at
java.security.AccessController.doPrivileged(AccessController.java:350)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.startActivator(BundleContext.java:1050)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.start(BundleContext.java:991)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:403)
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.start(Bundle.java:312)
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.requireClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findRequiredClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled
Code))
[diagram] at java.lang.ClassLoader.defineClass0(Native Method)
[diagram] at java.lang.ClassLoader.defineClass(ClassLoader.java(Compiled
Code))
[diagram] at
org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.defineClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader.findClassImpl(DefaultClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.defaultadaptor.DefaultClassLoader.findClass(DefaultClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.findLocalClass(BundleClassLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.loadClass(Bundle.java(Compiled
 Code))
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.internalDoPluginActivation(PluginDescriptor.java:471)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.doPluginActivation(PluginDescriptor.java:438)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.getPlugin(PluginDescriptor.java:406)
[diagram] at
org.eclipse.core.internal.compatibility.PluginActivator.start(PluginActivator.java:48)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext$1.run(BundleContext.java:1054)
[diagram] at java.security.AccessController.doPrivileged1(Native Method)
[diagram] at
java.security.AccessController.doPrivileged(AccessController.java:350)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.startActivator(BundleContext.java:1050)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.start(BundleContext.java:991)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:403)
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.start(Bundle.java:312)
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.requireClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findRequiredClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled
Code))
[diagram] at someplugin.someOperation.<init>(someOperation.java:47)
[diagram] at someplugin.CustomTask.execute(Unknown Source)
[diagram] at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[diagram] at org.apache.tools.ant.Task.perform(Task.java:401)
[diagram] at org.apache.tools.ant.Target.execute(Target.java:338)
[diagram] at org.apache.tools.ant.Target.performTasks(Target.java:365)
[diagram] at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:661)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:438)
[diagram] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:84)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[diagram] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled
 Code))
[diagram] at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
[diagram] at org.eclipse.ant.core.AntRunner.run(AntRunner.java:342)
[diagram] at
org.eclipse.ant.internal.ui.launchConfigurations.AntLaunchDelegate.launch(AntLaunchDelegate.java:225)
[diagram] at
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:157)
[diagram] at
org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:778)
[diagram] at
org.eclipse.debug.ui.DebugUITools.buildAndLaunch(DebugUITools.java:628)
[diagram] at org.eclipse.debug.ui.DebugUITools$2.run(DebugUITools.java:536)
[diagram] at
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
[diagram] Caused by:
org.eclipse.jface.util.Assert$AssertionFailedException: null argument;
[diagram] at org.eclipse.jface.util.Assert.isNotNull(Assert.java:139)
[diagram] at org.eclipse.jface.util.Assert.isNotNull(Assert.java:116)
[diagram] at
org.eclipse.jface.resource.ImageRegistry.<init>(ImageRegistry.java:66)
[diagram] at
org.eclipse.jface.resource.ImageRegistry.<init>(ImageRegistry.java:58)
<Some custom plugin resource manager stuff here>
[diagram] org.osgi.framework.BundleException: Exception in
org.eclipse.core.internal.compatibility.PluginActivator.start()
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.startActivator(BundleContext.java:1071)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.start(BundleContext.java:991)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:403)
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.start(Bundle.java:312)
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.requireClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findRequiredClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled
Code))
[diagram] at someplugin.someOperation.<init>(someOperation.java:47)
[diagram] at someplugin.CustomTask.execute(Unknown Source)
[diagram] at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[diagram] at org.apache.tools.ant.Task.perform(Task.java:401)
[diagram] at org.apache.tools.ant.Target.execute(Target.java:338)
[diagram] at org.apache.tools.ant.Target.performTasks(Target.java:365)
[diagram] at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:661)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:438)
[diagram] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:84)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[diagram] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled
 Code))
[diagram] at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
[diagram] at org.eclipse.ant.core.AntRunner.run(AntRunner.java:342)
[diagram] at
org.eclipse.ant.internal.ui.launchConfigurations.AntLaunchDelegate.launch(AntLaunchDelegate.java:225)
[diagram] at
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:157)
[diagram] at
org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:778)
[diagram] at
org.eclipse.debug.ui.DebugUITools.buildAndLaunch(DebugUITools.java:628)
[diagram] at org.eclipse.debug.ui.DebugUITools$2.run(DebugUITools.java:536)
[diagram] at
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
[diagram] java.lang.NoClassDefFoundError:
com/ibm/xtools/common/ui/internal/plugin/XToolsUIPlugin
[diagram] at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
[diagram] at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:79)
[diagram] at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java(Compiled
 Code))
[diagram] at
java.lang.reflect.Constructor.newInstance(Constructor.java(Compiled Code))
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.internalDoPluginActivation(PluginDescriptor.java:488)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.doPluginActivation(PluginDescriptor.java:438)
[diagram] at
org.eclipse.core.internal.plugins.PluginDescriptor.getPlugin(PluginDescriptor.java:406)
[diagram] at
org.eclipse.core.internal.compatibility.PluginActivator.start(PluginActivator.java:48)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext$1.run(BundleContext.java:1054)
[diagram] at java.security.AccessController.doPrivileged1(Native Method)
[diagram] at
java.security.AccessController.doPrivileged(AccessController.java:350)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.startActivator(BundleContext.java:1050)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleContext.start(BundleContext.java:991)
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:403)
[diagram] at
org.eclipse.osgi.framework.internal.core.Bundle.start(Bundle.java:312)
[diagram] at
org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.requireClass(BundleLoader.java(Inlined
 Compiled Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findRequiredClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java(Compiled
 Code))
[diagram] at
org.eclipse.osgi.framework.adaptor.BundleClassLoader.loadClass(BundleClassLoader.java(Compiled
 Code))
[diagram] at java.lang.ClassLoader.loadClass(ClassLoader.java(Compiled
Code))
[diagram] at someplugin.someOperation.<init>(someOperation.java:47)
[diagram] at someplugin.CustomTask.execute(Unknown Source)
[diagram] at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:306)
[diagram] at org.apache.tools.ant.Task.perform(Task.java:401)
[diagram] at org.apache.tools.ant.Target.execute(Target.java:338)
[diagram] at org.apache.tools.ant.Target.performTasks(Target.java:365)
[diagram] at org.apache.tools.ant.Project.executeTarget(Project.java:1237)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:661)
[diagram] at
org.eclipse.ant.internal.core.ant.InternalAntRunner.run(InternalAntRunner.java:438)
[diagram] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:84)
[diagram] at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[diagram] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled
 Code))
[diagram] at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
[diagram] at org.eclipse.ant.core.AntRunner.run(AntRunner.java:342)
[diagram] at
org.eclipse.ant.internal.ui.launchConfigurations.AntLaunchDelegate.launch(AntLaunchDelegate.java:225)
[diagram] at
org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:157)
[diagram] at
org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:778)
[diagram] at
org.eclipse.debug.ui.DebugUITools.buildAndLaunch(DebugUITools.java:628)
[diagram] at org.eclipse.debug.ui.DebugUITools$2.run(DebugUITools.java:536)
[diagram] at
org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:101)
BUILD FAILED: java.lang.NullPointerException

Is the result of something that I am doing or is it the new OSGi framework
in eclipse.

Any information would be greatly appreciated.

Thanks,

Chris McGee
IBM
Ottawa, Canada
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