java.lang.NullPointerException
        at com.sun.tools.javac.code.Types$IsSameTypeFcn.isSameType(Types.java:598)
        at com.sun.tools.javac.code.Types.isSameType(Types.java:588)
        at com.sun.tools.javac.comp.Attr.condType1(Attr.java:792)
        at com.sun.tools.javac.comp.Attr.condType(Attr.java:768)
        at com.sun.tools.javac.comp.Attr.visitConditional(Attr.java:749)
        at com.sun.tools.javac.tree.Tree$Conditional.accept(Tree.java:705)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:256)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:271)
        at com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:951)
        at com.sun.tools.javac.tree.Tree$Return.accept(Tree.java:774)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:256)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:291)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:307)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:561)
        at com.sun.tools.javac.tree.Tree$Block.accept(Tree.java:540)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:256)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:291)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:494)
        at com.sun.tools.javac.tree.Tree$MethodDef.accept(Tree.java:482)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:256)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:291)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2418)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2351)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2300)
        at org.netbeans.lib.gjast.ASErrorChecker.compile(ASErrorChecker.java:108)
        at org.netbeans.lib.gjast.ASErrorChecker.parse(ASErrorChecker.java:52)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl$ErrorList.initCheck(ResourceImpl.java:1035)
        at org.netbeans.modules.javacore.jmiimpl.javamodel.ResourceImpl$ErrorList.size(ResourceImpl.java:1044)
        at org.netbeans.modules.java.JavaEditor.refreshAnnotations(JavaEditor.java:378)
        at org.netbeans.modules.java.JavaEditor.access$100(JavaEditor.java:62)
        at org.netbeans.modules.java.JavaEditor$1.resourceParsed(JavaEditor.java:168)
        at org.netbeans.modules.java.JavaEditor$WParsingListener.resourceParsed(JavaEditor.java:2685)
        at org.netbeans.modules.javacore.JMManager$3.run(JMManager.java:832)
        at org.openide.util.Task.run(Task.java:136)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:330)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:686)