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java.lang.NullPointerException: 	at org.eclipse.core.internal.filebuffers.ResourceTextFileBuffer.handleFileContentChanged(ResourceTextFileBuffer.java:499)	at org.eclipse.core.internal.filebuffers.ResourceFileBuffer$1.execute(ResourceFileBuffer.java:142)	at org.eclipse.core.internal.filebuffers.ResourceFileBuffer$SafeFileChange.run(ResourceFileBuffer.java:86)	at org.eclipse.core.internal.filebuffers.ResourceFileBuffer$FileSynchronizer.resourceChanged(ResourceFileBuffer.java:182)	at org.eclipse.core.internal.events.NotificationManager$1.run(NotificationManager.java:291)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285)	at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149)	at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:395)	at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1530)	at org.eclipse.core.internal.resources.Container.setDefaultCharset(Container.java:416)	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:407)	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.configureNewMavenProject(ProjectConfigurationManager.java:240)	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.importProjects(ProjectConfigurationManager.java:156)	at org.springframework.ide.eclipse.maven.MavenCorePlugin.createEclipseProjectFromExistingMavenProject(MavenCorePlugin.java:244)	at org.springframework.ide.eclipse.wizard.template.util.ExampleProjectsImporterJob.createEclipseProjectFromExistingMavenProject(ExampleProjectsImporterJob.java:313)	at org.springframework.ide.eclipse.wizard.template.util.ExampleProjectsImporterJob.createExistingMavenProject(ExampleProjectsImporterJob.java:296)	at org.springframework.ide.eclipse.wizard.template.util.ExampleProjectsImporterJob.run(ExampleProjectsImporterJob.java:155)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)