FULL PRODUCT VERSION :
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) Server VM (build 20.1-b02, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux courant 2.6.38-11-generic #50-Ubuntu SMP Mon Sep 12 21:18:14 UTC 2011 i686 i686 i386 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
Compiling 9 source files to /home/horst/dev/NB/MVA-DB/EvtEditor/build/classes
An exception has occurred in the compiler (1.6.0_26). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.AssertionError
at com.sun.tools.javac.jvm.Code$State.forceStackTop(Code.java:1688)
at com.sun.tools.javac.jvm.Gen.visitConditional(Gen.java:1679)
at com.sun.tools.javac.tree.JCTree$JCConditional.accept(JCTree.java:1021)
at com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:818)
at com.sun.tools.javac.jvm.Gen.visitAssign(Gen.java:1752)
at com.sun.tools.javac.tree.JCTree$JCAssign.accept(JCTree.java:1342)
at com.sun.tools.javac.jvm.Gen.genExpr(Gen.java:818)
at com.sun.tools.javac.jvm.Gen.visitExec(Gen.java:1605)
at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1074)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:686)
at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:737)
at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1013)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:739)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:686)
at com.sun.tools.javac.jvm.Gen.visitIf(Gen.java:1589)
at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1050)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:686)
at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:737)
at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1013)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:739)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:686)
at com.sun.tools.javac.jvm.Gen.genLoop(Gen.java:1062)
at com.sun.tools.javac.jvm.Gen.visitForLoop(Gen.java:1033)
at com.sun.tools.javac.tree.JCTree$JCForLoop.accept(JCTree.java:818)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:686)
at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:737)
at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1013)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:739)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:686)
at com.sun.tools.javac.jvm.Gen.visitIf(Gen.java:1589)
at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1050)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:686)
at com.sun.tools.javac.jvm.Gen.genStats(Gen.java:737)
at com.sun.tools.javac.jvm.Gen.visitBlock(Gen.java:1013)
at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:739)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genStat(Gen.java:700)
at com.sun.tools.javac.jvm.Gen.genMethod(Gen.java:893)
at com.sun.tools.javac.jvm.Gen.visitMethodDef(Gen.java:866)
at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:639)
at com.sun.tools.javac.jvm.Gen.genDef(Gen.java:665)
at com.sun.tools.javac.jvm.Gen.genClass(Gen.java:2198)
at com.sun.tools.javac.main.JavaCompiler.genCode(JavaCompiler.java:617)
at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1289)
at com.sun.tools.javac.main.JavaCompiler.generate(JavaCompiler.java:1259)
at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:765)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:730)
at com.sun.tools.javac.main.Main.compile(Main.java:353)
at com.sun.tools.javac.main.Main.compile(Main.java:279)
at com.sun.tools.javac.main.Main.compile(Main.java:270)
at com.sun.tools.javac.Main.compile(Main.java:69)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:56)
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1134)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:912)
at org.netbeans.modules.java.source.ant.JavacTask.execute(JavacTask.java:144)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor180.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor180.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:398)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor180.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:390)
at org.apache.tools.ant.Target.performTasks(Target.java:411)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:284)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:539)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)
/home/horst/dev/NB/MVA-DB/EvtEditor/nbproject/build-impl.xml:604: The following error occurred while executing this line:
/home/horst/dev/NB/MVA-DB/EvtEditor/nbproject/build-impl.xml:246: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 0 seconds)


REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Replacing
Object cvA = cv instanceof Integer ? new int[1] : cv instanceof Number ? new double[1] : new String[1];
by
Object cvA = Array.newInstance( cv instanceof Integer ? int.class : cv instanceof Number ? double.class : String.class, 1);
works, aka that seams to be duplicate of bug id 6500343

Unclear why netbeans compileOnSave (incremental) doesnt fail but "clean and build" creates the fault observed