Got following NPE from the javac when editing code. Caused by the unfinished
code in the innerclass ElementChildren method resetKeys().

Will attach the file in the state which makes the exception to be thrown.

The NPE:

SEVERE [global]
java.lang.NullPointerException
        at com.sun.tools.javac.comp.Attr.visitNewClass(Attr.java:1491)
        at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1261)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:429)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1242)
        at
com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1214)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:392)
        at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1025)
        at
com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1078)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:421)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:723)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:743)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:642)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:643)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2704)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2635)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2568)
        at com.sun.tools.javac.comp.Attr.visitClassDef(Attr.java:533)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:579)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2704)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2635)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2568)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1045)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1021)
        at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:427)
        at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:407)
[catch] at org.netbeans.api.java.source.JavaSource.moveToPhase(JavaSource.java:885)
        at
org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1159)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
        at java.util.concurrent.FutureTask.run(FutureTask.java:123)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)
Caused by: An error occurred during parsing of
'/netbeans/trunk/nb_all/java/navigation/src/org/netbeans/modules/java/navigation/ElementNode.java'.
Please report a bug against java/source and attach dump file
'/netbeans/user/dev/var/log/ElementNode_3.dump'.
ALL [null]: An error occurred during parsing of
'/netbeans/trunk/nb_all/java/navigation/src/org/netbeans/modules/java/navigation/ElementNode.java'.
Please report a bug against java/source and attach dump file
'/netbeans/user/dev/var/log/ElementNode_3.dump'.
SEVERE [global]
java.lang.NullPointerException
        at com.sun.tools.javac.comp.Attr.visitNewClass(Attr.java:1491)
        at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1261)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:429)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1242)
        at
com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1214)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:392)
        at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1025)
        at
com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1078)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:421)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:723)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:743)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:642)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:643)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2704)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2635)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2568)
        at com.sun.tools.javac.comp.Attr.visitClassDef(Attr.java:533)
        at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:579)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:368)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:405)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2704)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2635)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2568)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1045)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1021)
        at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:427)
        at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:407)
        at org.netbeans.api.java.source.JavaSource.moveToPhase(JavaSource.java:885)
[catch] at
org.netbeans.api.java.source.JavaSource$CompilationJob.run(JavaSource.java:1159)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:417)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:269)
        at java.util.concurrent.FutureTask.run(FutureTask.java:123)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)
Caused by: An error occurred during parsing of
'/netbeans/trunk/nb_all/java/navigation/src/org/netbeans/modules/java/navigation/ElementNode.java'.
Please report a bug against java/source and attach dump file
'/netbeans/user/dev/var/log/ElementNode_3.dump'.
ALL [null]: An error occurred during parsing of
'/netbeans/trunk/nb_all/java/navigation/src/org/netbeans/modules/java/navigation/ElementNode.java'.
Please report a bug against java/source and attach dump file
'/netbeans/user/dev/var/log/ElementNode_3.dump'.
INFO [org.netbeans.modules.j2ee.jpa.verification.JPAProblemFinder]: resetting
errors, current number of errors in file:0