java.lang.NullPointerException: This exception has no message.

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This exception has no message.
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java.lang.NullPointerException:
at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:881)
at com.springsource.server.web.core.internal.WebAppClassLoaderDelegateHook.addWebApplication(WebAppClassLoaderDelegateHook.java:56)
at com.springsource.server.web.core.internal.WebBundleLifecycleListener.onStarted(WebBundleLifecycleListener.java:88)
at com.springsource.kernel.install.artifact.internal.ArtifactStateMonitor.onStarted(ArtifactStateMonitor.java:241)
at com.springsource.kernel.install.artifact.internal.AbstractInstallArtifact.asyncStartSucceeded(AbstractInstallArtifact.java:245)
at com.springsource.kernel.install.artifact.internal.AbstractInstallArtifact$StateMonitorSignal.signalSuccessfulCompletion(AbstractInstallArtifact.java:207)
at com.springsource.kernel.core.internal.BundleStartTracker$1.run(BundleStartTracker.java:150)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:637)

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