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java.lang.NullPointerException: 	at org.eclipse.jdt.apt.core.internal.AptCompilationParticipant.addJava6GeneratedFile(AptCompilationParticipant.java:272)	at org.eclipse.jdt.internal.apt.pluggable.core.dispatch.IdeProcessingEnvImpl.addNewUnit(IdeProcessingEnvImpl.java:132)	at org.eclipse.jdt.internal.apt.pluggable.core.filer.IdeJavaSourceOutputStream.close(IdeJavaSourceOutputStream.java:72)	at sun.nio.cs.StreamEncoder.implClose(StreamEncoder.java:320)	at sun.nio.cs.StreamEncoder.close(StreamEncoder.java:149)	at java.io.OutputStreamWriter.close(OutputStreamWriter.java:233)	at java.io.BufferedWriter.close(BufferedWriter.java:266)	at java.io.PrintWriter.close(PrintWriter.java:339)	at org.hibernate.jpamodelgen.ClassWriter.writeFile(ClassWriter.java:80)	at org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor.createMetaModelClasses(JPAMetaModelEntityProcessor.java:155)	at org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor.process(JPAMetaModelEntityProcessor.java:145)	at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.handleProcessor(RoundDispatcher.java:139)	at org.eclipse.jdt.internal.compiler.apt.dispatch.RoundDispatcher.round(RoundDispatcher.java:121)	at org.eclipse.jdt.internal.compiler.apt.dispatch.BaseAnnotationProcessorManager.processAnnotations(BaseAnnotationProcessorManager.java:159)	at org.eclipse.jdt.internal.apt.pluggable.core.dispatch.IdeAnnotationProcessorManager.processAnnotations(IdeAnnotationProcessorManager.java:134)	at org.eclipse.jdt.internal.compiler.Compiler.processAnnotations(Compiler.java:820)	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:434)	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:365)	at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.compile(BatchImageBuilder.java:178)	at org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:302)	at org.eclipse.jdt.internal.core.builder.BatchImageBuilder.build(BatchImageBuilder.java:60)	at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildAll(JavaBuilder.java:254)	at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:173)	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:726)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)	at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:513)	at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:422)	at org.eclipse.ui.actions.GlobalBuildAction$1.run(GlobalBuildAction.java:180)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)