When you started Eclipse this error appeared:
An internal error occurred during: "Initializing Java Tooling". java.lang.NullPointerException
Why did this error appear?
These were the error messages found in the folder;
!ENTRY org.eclipse.osgi 2 0 2015-11-29 08:07:32.156
!MESSAGE While loading class "org.eclipse.m2e.jdt.internal.MavenClasspathContainerInitializer", thread "Thread[Worker-1,5,main]" timed out waiting (5049ms) for thread "Thread[Worker-4,5,main]" to finish starting bundle "org.eclipse.m2e.jdt_1.6.2.20150902-0002 [550]". To avoid deadlock, thread "Thread[Worker-1,5,main]" is proceeding but "org.eclipse.m2e.jdt.internal.MavenClasspathContainerInitializer" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: Unable to acquire the state change lock for the module: osgi.identity; osgi.identity="org.eclipse.m2e.jdt"; type="osgi.bundle"; version:Version="1.6.2.20150902-0002"; singleton:="true" [id=550] STARTED [STARTED]
at org.eclipse.osgi.container.Module.lockStateChange(Module.java:329)
at org.eclipse.osgi.container.Module.start(Module.java:389)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:327)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:402)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.osgi.internal.framework.EquinoxBundle.loadClass(EquinoxBundle.java:573)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
at org.eclipse.jdt.core.JavaCore.computeClasspathContainerInitializer(JavaCore.java:3345)
at org.eclipse.jdt.core.JavaCore.getClasspathContainerInitializer(JavaCore.java:3321)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2849)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1900)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:3298)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2693)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2857)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1995)
at org.eclipse.jst.j2ee.classpathdep.ClasspathDependencyUtil.getComponentClasspathDependencies(ClasspathDependencyUtil.java:356)
at org.eclipse.jst.j2ee.classpathdep.ClasspathDependencyUtil.getComponentClasspathDependencies(ClasspathDependencyUtil.java:276)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getJavaClasspathReferences(J2EEModuleVirtualComponent.java:272)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getNonManifestRefs(J2EEModuleVirtualComponent.java:242)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:166)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:214)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:207)
at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.hasConsumableReferences(SingleRootUtil.java:217)
at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.validateSingleRoot(SingleRootUtil.java:165)
at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.isSingleRoot(SingleRootUtil.java:93)
at org.eclipse.jst.common.internal.modulecore.SingleRootExportParticipant.canOptimize(SingleRootExportParticipant.java:90)
at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.canOptimize(FlatVirtualComponent.java:203)
at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.cacheResources(FlatVirtualComponent.java:185)
at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.getChildModules(FlatVirtualComponent.java:160)
at org.eclipse.wst.web.internal.deployables.FlatComponentDeployable.getExportModelChildren(FlatComponentDeployable.java:252)
at org.eclipse.wst.web.internal.deployables.FlatComponentDeployable.getModules(FlatComponentDeployable.java:263)
at org.eclipse.jst.server.tomcat.core.internal.TomcatServer.getChildModules(TomcatServer.java:378)
at org.eclipse.wst.server.core.internal.Server.getChildModules(Server.java:2637)
at org.eclipse.wst.server.core.internal.Server.visitModule(Server.java:3058)
at org.eclipse.wst.server.core.internal.Server.visit(Server.java:3039)
at org.eclipse.wst.server.core.internal.Server.getAllModules(Server.java:1542)
at org.eclipse.wst.server.ui.internal.cnf.ServersView2$3.run(ServersView2.java:189)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
!ENTRY org.eclipse.osgi 2 0 2015-11-29 08:07:36.045
!MESSAGE While loading class "org.eclipse.m2e.jdt.internal.MavenClasspathContainerInitializer", thread "Thread[Worker-3,5,main]" timed out waiting (5000ms) for thread "Thread[Worker-4,5,main]" to finish starting bundle "org.eclipse.m2e.jdt_1.6.2.20150902-0002 [550]". To avoid deadlock, thread "Thread[Worker-3,5,main]" is proceeding but "org.eclipse.m2e.jdt.internal.MavenClasspathContainerInitializer" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: Unable to acquire the state change lock for the module: osgi.identity; osgi.identity="org.eclipse.m2e.jdt"; type="osgi.bundle"; version:Version="1.6.2.20150902-0002"; singleton:="true" [id=550] STARTED [STARTED]
at org.eclipse.osgi.container.Module.lockStateChange(Module.java:329)
at org.eclipse.osgi.container.Module.start(Module.java:389)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:327)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:402)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.osgi.internal.framework.EquinoxBundle.loadClass(EquinoxBundle.java:573)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
at org.eclipse.jdt.core.JavaCore.computeClasspathContainerInitializer(JavaCore.java:3345)
at org.eclipse.jdt.core.JavaCore.getClasspathContainerInitializer(JavaCore.java:3321)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2849)
at org.eclipse.jdt.internal.core.JavaModelManager$10.run(JavaModelManager.java:2774)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2241)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeAllContainers(JavaModelManager.java:2814)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1895)
at org.eclipse.jdt.core.JavaCore.initializeAfterLoad(JavaCore.java:4067)
at org.eclipse.jdt.internal.ui.InitializeAfterLoadJob$RealJob.run(InitializeAfterLoadJob.java:36)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
!ENTRY org.eclipse.osgi 2 0 2015-11-29 08:07:37.634
!MESSAGE While loading class "org.eclipse.m2e.jdt.internal.MavenClasspathHelpers", thread "Thread[Worker-1,5,main]" timed out waiting (5001ms) for thread "Thread[Worker-4,5,main]" to finish starting bundle "org.eclipse.m2e.jdt_1.6.2.20150902-0002 [550]". To avoid deadlock, thread "Thread[Worker-1,5,main]" is proceeding but "org.eclipse.m2e.jdt.internal.MavenClasspathHelpers" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: Unable to acquire the state change lock for the module: osgi.identity; osgi.identity="org.eclipse.m2e.jdt"; type="osgi.bundle"; version:Version="1.6.2.20150902-0002"; singleton:="true" [id=550] STARTED [STARTED]
at org.eclipse.osgi.container.Module.lockStateChange(Module.java:329)
at org.eclipse.osgi.container.Module.start(Module.java:389)
at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:454)
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:324)
at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:327)
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:402)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:352)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:344)
at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.m2e.jdt.internal.MavenClasspathContainerInitializer.initialize(MavenClasspathContainerInitializer.java:44)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2868)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1900)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:3298)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2693)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2857)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1995)
at org.eclipse.jst.j2ee.classpathdep.ClasspathDependencyUtil.getComponentClasspathDependencies(ClasspathDependencyUtil.java:356)
at org.eclipse.jst.j2ee.classpathdep.ClasspathDependencyUtil.getComponentClasspathDependencies(ClasspathDependencyUtil.java:276)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getJavaClasspathReferences(J2EEModuleVirtualComponent.java:272)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getNonManifestRefs(J2EEModuleVirtualComponent.java:242)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:166)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:214)
at org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent.getReferences(J2EEModuleVirtualComponent.java:207)
at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.hasConsumableReferences(SingleRootUtil.java:217)
at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.validateSingleRoot(SingleRootUtil.java:165)
at org.eclipse.jst.common.internal.modulecore.SingleRootUtil.isSingleRoot(SingleRootUtil.java:93)
at org.eclipse.jst.common.internal.modulecore.SingleRootExportParticipant.canOptimize(SingleRootExportParticipant.java:90)
at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.canOptimize(FlatVirtualComponent.java:203)
at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.cacheResources(FlatVirtualComponent.java:185)
at org.eclipse.wst.common.componentcore.internal.flat.FlatVirtualComponent.getChildModules(FlatVirtualComponent.java:160)
at org.eclipse.wst.web.internal.deployables.FlatComponentDeployable.getExportModelChildren(FlatComponentDeployable.java:252)
at org.eclipse.wst.web.internal.deployables.FlatComponentDeployable.getModules(FlatComponentDeployable.java:263)
at org.eclipse.jst.server.tomcat.core.internal.TomcatServer.getChildModules(TomcatServer.java:378)
at org.eclipse.wst.server.core.internal.Server.getChildModules(Server.java:2637)
at org.eclipse.wst.server.core.internal.Server.visitModule(Server.java:3058)
at org.eclipse.wst.server.core.internal.Server.visit(Server.java:3039)
at org.eclipse.wst.server.core.internal.Server.getAllModules(Server.java:1542)
at org.eclipse.wst.server.ui.internal.cnf.ServersView2$3.run(ServersView2.java:189)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
!ENTRY org.eclipse.core.resources 4 2 2015-11-29 08:07:46.845
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".
!STACK 0
java.lang.NullPointerException
at org.eclipse.m2e.jdt.internal.MavenClasspathContainerInitializer.initialize(MavenClasspathContainerInitializer.java:46)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2868)
at org.eclipse.jdt.internal.core.JavaModelManager$10.run(JavaModelManager.java:2774)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeAllContainers(JavaModelManager.java:2812)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1895)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:3298)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2693)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2857)
at org.eclipse.jdt.internal.core.ClasspathChange.generateDelta(ClasspathChange.java:235)
at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:2032)
at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:477)
at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:299)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:289)
at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:152)
at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:373)
at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1470)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2250)
at org.eclipse.core.internal.events.NotificationManager$NotifyJob.run(NotificationManager.java:43)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
!ENTRY org.eclipse.core.jobs 4 2 2015-11-29 08:07:47.275
!MESSAGE An internal error occurred during: "Initializing Java Tooling".
!STACK 0
java.lang.NullPointerException
at org.eclipse.m2e.jdt.internal.MavenClasspathContainerInitializer.initialize(MavenClasspathContainerInitializer.java:46)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2868)
at org.eclipse.jdt.internal.core.JavaModelManager$10.run(JavaModelManager.java:2774)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2241)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeAllContainers(JavaModelManager.java:2814)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1895)
at org.eclipse.jdt.core.JavaCore.initializeAfterLoad(JavaCore.java:4067)
at org.eclipse.jdt.internal.ui.InitializeAfterLoadJob$RealJob.run(InitializeAfterLoadJob.java:36)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
!ENTRY org.eclipse.egit.ui 2 0 2015-11-29 08:07:49.388
!MESSAGE Warning: The environment variable HOME is not set. The following directory will be used to store the Git
user global configuration and to define the default location to store repositories: 'C:\Users\mary'. If this is
not correct please set the HOME environment variable and restart Eclipse. Otherwise Git for Windows and
EGit might behave differently since they see different configuration options.
This warning can be switched off on the Team > Git > Confirmations and Warnings preference page.