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java.lang.NullPointerException: 	at org.eclipse.jdt.internal.compiler.lookup.ClassScope.buildMethods(ClassScope.java:330)	at org.eclipse.jdt.internal.compiler.lookup.ClassScope.buildFieldsAndMethods(ClassScope.java:183)	at org.eclipse.jdt.internal.compiler.lookup.ClassScope.buildFieldsAndMethods(ClassScope.java:194)	at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildFieldsAndMethods(CompilationUnitScope.java:84)	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:303)	at org.eclipse.jdt.internal.core.hierarchy.HierarchyResolver.accept(HierarchyResolver.java:166)	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:186)	at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:201)	at org.eclipse.jdt.internal.compiler.lookup.Scope.getPackage(Scope.java:2868)	at org.eclipse.jdt.internal.compiler.ast.QualifiedTypeReference.getTypeBinding(QualifiedTypeReference.java:97)	at org.eclipse.jdt.internal.compiler.ast.TypeReference.internalResolveType(TypeReference.java:495)	at org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveType(TypeReference.java:594)	at org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveType(TypeReference.java:590)	at org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveSuperType(TypeReference.java:564)	at org.eclipse.jdt.internal.compiler.lookup.ClassScope.findSupertype(ClassScope.java:1318)	at org.eclipse.jdt.internal.compiler.lookup.ClassScope.connectSuperInterfaces(ClassScope.java:1050)	at org.eclipse.jdt.internal.compiler.lookup.ClassScope.connectTypeHierarchy(ClassScope.java:1112)	at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.connectTypeHierarchy(CompilationUnitScope.java:321)	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:325)	at org.eclipse.jdt.internal.core.hierarchy.HierarchyResolver.resolve(HierarchyResolver.java:816)	at org.eclipse.jdt.internal.core.hierarchy.RegionBasedHierarchyBuilder.createTypeHierarchyBasedOnRegion(RegionBasedHierarchyBuilder.java:91)	at org.eclipse.jdt.internal.core.hierarchy.RegionBasedHierarchyBuilder.build(RegionBasedHierarchyBuilder.java:60)	at org.eclipse.jdt.internal.core.hierarchy.RegionBasedTypeHierarchy.compute(RegionBasedTypeHierarchy.java:98)	at org.eclipse.jdt.internal.core.hierarchy.TypeHierarchy.refresh(TypeHierarchy.java:1268)	at org.eclipse.jdt.internal.core.CreateTypeHierarchyOperation.executeOperation(CreateTypeHierarchyOperation.java:90)	at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:729)	at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:789)	at org.eclipse.jdt.core.JavaCore.newTypeHierarchy(JavaCore.java:4560)	at org.eclipse.jdt.internal.junit.launcher.JUnit4TestFinder.findTestsInContainer(JUnit4TestFinder.java:128)	at org.eclipse.jdt.internal.junit.util.TestSearchEngine$1.run(TestSearchEngine.java:41)	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119)