FULL PRODUCT VERSION :
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b86, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
I was compiling the NetBeans server plugin for WebLogic 9 and received a NullPointerException inside the javac compiler.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
An exception has occurred in the compiler (1.6.0-beta2). 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.NullPointerException
        at com.sun.tools.javac.util.Name.getBytes(Name.java:171)
        at com.sun.tools.javac.util.Name.append(Name.java:304)
        at com.sun.tools.javac.code.Symbol$TypeSymbol.formFlatName(Symbol.java:510)
        at com.sun.tools.javac.jvm.ClassReader.enterClass(ClassReader.java:1673)
        at com.sun.tools.javac.jvm.ClassReader.includeClassFile(ClassReader.java:1955)
        at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2056)
        at com.sun.tools.javac.jvm.ClassReader.fillIn(ClassReader.java:2009)
        at com.sun.tools.javac.jvm.ClassReader.complete(ClassReader.java:1725)
        at com.sun.tools.javac.code.Symbol.complete(Symbol.java:383)
        at com.sun.tools.javac.code.Symbol$PackageSymbol.members(Symbol.java:594)
        at com.sun.tools.javac.comp.MemberEnter.importAll(MemberEnter.java:119)
        at com.sun.tools.javac.comp.MemberEnter.visitTopLevel(MemberEnter.java:509)
        at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:445)
        at com.sun.tools.javac.comp.MemberEnter.memberEnter(MemberEnter.java:387)
        at com.sun.tools.javac.comp.MemberEnter.complete(MemberEnter.java:797)
        at com.sun.tools.javac.code.Symbol.complete(Symbol.java:383)
        at com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:756)
        at com.sun.tools.javac.comp.Enter.complete(Enter.java:430)
        at com.sun.tools.javac.comp.Enter.main(Enter.java:408)
        at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:752)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:659)
        at com.sun.tools.javac.main.Main.compile(Main.java:327)
        at com.sun.tools.javac.main.Main.compile(Main.java:253)
        at com.sun.tools.javac.main.Main.compile(Main.java:244)
        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:589)
        at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:55)
        at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:931)
        at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:757)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
        at org.apache.tools.ant.Task.perform(Task.java:364)
        at org.apache.tools.ant.Target.execute(Target.java:341)
        at org.apache.tools.ant.Target.performTasks(Target.java:369)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
        at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:240)
        at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:293)
        at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:131)


REPRODUCIBILITY :
This bug can be reproduced rarely.