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This bug was originally marked as duplicate of bug 239412, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.0.2 (Build 201411181905) VM: Java HotSpot(TM) 64-Bit Server VM, 25.25-b02, Java(TM) SE Runtime Environment, 1.8.0_25-b18 OS: Windows 7 User Comments: GUEST: working with vaadin and the code from http://stackoverflow.com/questions/1839671/finding-installed-jdbc-drivers Stacktrace: java.lang.AssertionError: Wrong diagnostic handler: com.sun.tools.javac.util.Log$DeferredDiagnosticHandler@2b053735 Thread dump: Reference Handler java.lang.Object.wait(Native Method) java.lang.Object.wait(Object.java:502) java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157) Editor Parsing Loop (201411181905) java.lang.Thread.dumpThreads(Native Method) java.lang.Thread.getAllStackTraces(Thread.java:1603) com.sun.tools.javac.util.Log.popDiagnosticHandler(Log.java:469) com.sun.tools.javac.main.JavaCompiler.resolveIdent(JavaCompiler.java:726) com.sun.tools.javac.model.JavacElements.binaryNameToClassSymbol(JavacElements.java:129) com.sun.tools.javac.model.JavacElements.getTypeElementByBinaryName(JavacElements.java:119) org.netbeans.api.java.source.ElementHandle.getTypeElementByBinaryName(ElementHandle.java:622) org.netbeans.api.java.source.ElementHandle.resolveImpl(ElementHandle.java:160) org.netbeans.api.java.source.ElementHandle.resolve(ElementHandle.java:136) org.vaadin.netbeans.impl.A at com.sun.tools.javac.util.Assert.error(Assert.java:133) at com.sun.tools.javac.util.Assert.check(Assert.java:86) at com.sun.tools.javac.util.Log.popDiagnosticHandler(Log.java:481) at com.sun.tools.javac.main.JavaCompiler.resolveIdent(JavaCompiler.java:726) at com.sun.tools.javac.model.JavacElements.binaryNameToClassSymbol(JavacElements.java:129) at com.sun.tools.javac.model.JavacElements.getTypeElementByBinaryName(JavacElements.java:119)
Created attachment 151985 [details] stacktrace
*** This bug has been marked as a duplicate of bug 241006 ***