java.lang.IncompatibleClassChangeError: Implementing class
   at java.lang.ClassLoader.defineClass1(ClassLoader.java:0)
   at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
   at org.netbeans.JarClassLoader.doLoadClass(JarClassLoader.java:311)
   at org.netbeans.ProxyClassLoader.selfLoadClass(ProxyClassLoader.java:259)
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:217)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
   at java.lang.ClassLoader.defineClass1(ClassLoader.java:0)
   at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
   at org.netbeans.JarClassLoader.doLoadClass(JarClassLoader.java:311)
   at org.netbeans.ProxyClassLoader.selfLoadClass(ProxyClassLoader.java:259)
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:187)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
   at edu.umd.cs.findbugs.classfile.engine.asm.ClassReaderAnalysisEngine.analyze(ClassReaderAnalysisEngine.java:47)
   at edu.umd.cs.findbugs.classfile.engine.asm.ClassReaderAnalysisEngine.analyze(ClassReaderAnalysisEngine.java:34)
   at edu.umd.cs.findbugs.classfile.impl.AnalysisCache.getClassAnalysis(AnalysisCache.java:266)
   at edu.umd.cs.findbugs.classfile.engine.ClassInfoAnalysisEngine.analyze(ClassInfoAnalysisEngine.java:72)
   at edu.umd.cs.findbugs.classfile.engine.ClassInfoAnalysisEngine.analyze(ClassInfoAnalysisEngine.java:38)
   at edu.umd.cs.findbugs.classfile.impl.AnalysisCache.getClassAnalysis(AnalysisCache.java:266)
   at edu.umd.cs.findbugs.FindBugs2.buildReferencedClassSet(FindBugs2.java:875)
   at edu.umd.cs.findbugs.FindBugs2.execute(FindBugs2.java:221)
   at org.netbeans.modules.findbugs.RunFindBugs.runFindBugs(RunFindBugs.java:304)
   at org.netbeans.modules.findbugs.RunInEditor.doRun(RunInEditor.java:148)
   at org.netbeans.modules.findbugs.RunInEditor.run(RunInEditor.java:100)
   at org.netbeans.modules.findbugs.RunInEditor.run(RunInEditor.java:83)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:578)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:750)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
   at java.util.concurrent.FutureTask.run(FutureTask.java:262)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1425)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:59)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:294)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2038)