java.lang.NullPointerException
   at org.netbeans.modules.java.classfile.CodeGenerator$TreeBuilder.computeSuper(CodeGenerator.java:409)
   at org.netbeans.modules.java.classfile.CodeGenerator$TreeBuilder.visitType(CodeGenerator.java:330)
   at org.netbeans.modules.java.classfile.CodeGenerator$TreeBuilder.visitType(CodeGenerator.java:270)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.accept(Symbol.java:1172)
   at javax.lang.model.util.AbstractElementVisitor6.visit(AbstractElementVisitor6.java:111)
   at org.netbeans.modules.java.classfile.CodeGenerator$TreeBuilder.visitType(CodeGenerator.java:320)
   at org.netbeans.modules.java.classfile.CodeGenerator$TreeBuilder.visitType(CodeGenerator.java:270)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.accept(Symbol.java:1172)
   at javax.lang.model.util.AbstractElementVisitor6.visit(AbstractElementVisitor6.java:111)
   at org.netbeans.modules.java.classfile.CodeGenerator$TreeBuilder.visitType(CodeGenerator.java:320)
   at org.netbeans.modules.java.classfile.CodeGenerator$TreeBuilder.visitType(CodeGenerator.java:270)
   at com.sun.tools.javac.code.Symbol$ClassSymbol.accept(Symbol.java:1172)
   at javax.lang.model.util.AbstractElementVisitor6.visit(AbstractElementVisitor6.java:111)
   at org.netbeans.modules.java.classfile.CodeGenerator.generateCode(CodeGenerator.java:261)
   at org.netbeans.modules.java.classfile.CodeGenerator$1.run(CodeGenerator.java:218)
   at org.netbeans.modules.java.classfile.CodeGenerator$1.run(CodeGenerator.java:154)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:649)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:639)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:493)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:598)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:139)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:206)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:203)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:74)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:203)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:106)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:443)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:414)
   at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:660)
   at org.netbeans.modules.java.classfile.CodeGenerator.generateCode(CodeGenerator.java:154)
   at org.netbeans.modules.java.classfile.BinaryElementOpenImpl.open(BinaryElementOpenImpl.java:56)
   at org.netbeans.modules.java.ClassDataObject$OpenSourceCookie$1.run(ClassDataObject.java:151)
   at org.netbeans.modules.progress.ui.RunOffEDTImpl$1.run(RunOffEDTImpl.java:169)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)