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org.eclipse.jface.text.Assert$AssertionFailedException: null argument; at org.eclipse.jface.text.Assert.isNotNull(Assert.java:157) at org.eclipse.jface.text.Assert.isNotNull(Assert.java:133) at org.eclipse.jface.text.contentassist.ContentAssistant.setRepeatedInvocationTrigger(ContentAssistant.java:2125) at org.eclipse.jdt.internal.ui.text.java.ContentAssistProcessor$2.assistSessionStarted(ContentAssistProcessor.java:130) at org.eclipse.jface.text.contentassist.ContentAssistant.fireSessionBeginEvent(ContentAssistant.java:1992) at org.eclipse.jface.text.contentassist.ContentAssistant.prepareToShowCompletions(ContentAssistant.java:1469) at org.eclipse.jface.text.contentassist.ContentAssistant.completePrefix(ContentAssistant.java:1449) at org.eclipse.jdt.text.tests.contentassist.AbstractCompletionTest.incrementalAssist(AbstractCompletionTest.java:489) at org.eclipse.jdt.text.tests.contentassist.AbstractCompletionTest.assertIncrementalCompletion(AbstractCompletionTest.java:311) at org.eclipse.jdt.text.tests.contentassist.AbstractCompletionTest.assertMethodBodyIncrementalCompletion(AbstractCompletionTest.java:211) at org.eclipse.jdt.text.tests.contentassist.TypeCompletionTest.testIncrementalInsertionPrefixCorrection(TypeCompletionTest.java:225) at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java) at junit.extensions.TestDecorator.basicRun(TestDecorator.java:22) at junit.extensions.TestSetup$1.protect(TestSetup.java:19) at junit.extensions.TestSetup.run(TestSetup.java:23) at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:330) at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:204) at org.eclipse.test.UITestApplication$3.run(UITestApplication.java:188) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3141) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2843) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95) at org.eclipse.test.UITestApplication.runApplication(UITestApplication.java:131) at org.eclipse.test.UITestApplication.run(UITestApplication.java:58) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:396) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177) at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952) at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java) at org.apache.harmony.vm.JarRunner.main(JarRunner.java:80)