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This bug was originally marked as duplicate of bug 257082, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE Dev (Build 201609060002) VM: Java HotSpot(TM) 64-Bit Server VM, 25.102-b14, Java(TM) SE Runtime Environment, 1.8.0_102-b14 OS: Windows 10 User Comments: jonycus: opening a package of just built project tveimo: expanding java node in projects explorer GUEST: Opening any java file causes this error GUEST: <lonly open i can read the problem> mkhramov: Occurs on open project GUEST: please check GUEST: netbeans restart tveimo: scrolling the projects navigator GUEST: Updated netbeans and restarted. The error occured during initial startup and scanning of my projects Stacktrace: java.lang.NoClassDefFoundError: org/netbeans/lib/nbjavac/services/NBMessager at org.netbeans.modules.java.source.parsing.JavacParser.createJavacTask(JavacParser.java:869) at org.netbeans.modules.java.source.parsing.JavacParser.createJavacTask(JavacParser.java:735) at org.netbeans.modules.java.source.parsing.CompilationInfoImpl.getJavacTask(CompilationInfoImpl.java:397) at org.netbeans.modules.java.source.parsing.JavacParser.moveToPhase(JavacParser.java:604) at org.netbeans.modules.java.source.parsing.CompilationInfoImpl.toPhase(CompilationInfoImpl.java:384) at org.netbeans.api.java.source.CompilationController.toPhase(CompilationController.java:109)
Created attachment 162527 [details] stacktrace