SEVERE [global]
java.lang.NullPointerException
	at com.sun.tools.javac.code.Types.erasure(Types.java:1469)
	at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1495)
	at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1499)
	at com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:941)
	at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:3206)
	at com.sun.tools.javac.code.Types.erasure(Types.java:1472)
	at com.sun.tools.javac.code.Types$17.apply(Types.java:1504)
	at com.sun.tools.javac.code.Type.map(Type.java:118)
	at com.sun.tools.javac.code.Type$MethodType.map(Type.java:846)
	at com.sun.tools.javac.code.Types$16.visitType(Types.java:1480)
	at com.sun.tools.javac.code.Types$16.visitType(Types.java:1499)
	at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visitMethodType(Types.java:3153)
	at com.sun.tools.javac.code.Type$MethodType.accept(Type.java:791)
	at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:3206)
	at com.sun.tools.javac.code.Types.erasure(Types.java:1472)
	at com.sun.tools.javac.code.Types.overrideEquivalent(Types.java:1846)
	at com.sun.tools.javac.comp.Check.checkUnique(Check.java:1951)
	at com.sun.tools.javac.comp.MemberEnter.visitMethodDef(MemberEnter.java:593)
	at com.sun.tools.javadoc.JavadocMemberEnter.visitMethodDef(JavadocMemberEnter.java:47)
	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:639)
	at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:387)
	at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:399)
	at com.sun.tools.javac.comp.MemberEnter.finishClass(MemberEnter.java:410)
	at com.sun.tools.javac.comp.MemberEnter.finish(MemberEnter.java:1034)
	at com.sun.tools.javac.comp.MemberEnter.complete(MemberEnter.java:1001)
	at com.sun.tools.javac.code.Symbol.complete(Symbol.java:384)
	at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:760)
	at com.sun.tools.javac.code.Symbol$ClassSymbol.flags(Symbol.java:692)
	at com.sun.tools.javac.code.Symbol$ClassSymbol.getKind(Symbol.java:797)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.handlePossibleIdentifier(SemanticHighlighter.java:589)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.handlePossibleIdentifier(SemanticHighlighter.java:560)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:978)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:390)
	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:592)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:65)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:83)
	at com.sun.source.util.TreeScanner.visitClass(TreeScanner.java:117)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:980)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitClass(SemanticHighlighter.java:390)
	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:592)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at com.sun.source.util.TreeScanner.scan(TreeScanner.java:75)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:59)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitCompilationUnit(SemanticHighlighter.java:664)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter$DetectorVisitor.visitCompilationUnit(SemanticHighlighter.java:390)
	at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:478)
	at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:52)
	at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:50)
	at org.netbeans.modules.java.editor.semantic.ScanningCancellableTask.scan(ScanningCancellableTask.java:74)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.process(SemanticHighlighter.java:219)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.run(SemanticHighlighter.java:138)
	at org.netbeans.modules.java.editor.semantic.SemanticHighlighter.run(SemanticHighlighter.java:104)
[catch] at org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1056)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)