Google compilation error

 when i used class at  http://www.javapractices.com/topic/TopicAction.do?Id=82  in my web application i got after gwt compilation this

Compiling module com.se.ParametricAutomation

   Validating newly compiled units

      Ignored 2 units with compilation errors in first pass.

Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.

   [ERROR] An internal compiler exception occurred

com.google.gwt.dev.jjs.InternalCompilerException: Failed to get JNode

at com.google.gwt.dev.jjs.impl.TypeMap.get(TypeMap.java:140)

at com.google.gwt.dev.jjs.impl.TypeMap.get(TypeMap.java:71)

at com.google.gwt.dev.jjs.impl.BuildTypeMap.getType(BuildTypeMap.java:730)

at com.google.gwt.dev.jjs.impl.BuildTypeMap.process(BuildTypeMap.java:821)

at com.google.gwt.dev.jjs.impl.BuildTypeMap.access$700(BuildTypeMap.java:99)

at com.google.gwt.dev.jjs.impl.BuildTypeMap$BuildDeclMapVisitor.process(BuildTypeMap.java:325)

at com.google.gwt.dev.jjs.impl.BuildTypeMap$BuildDeclMapVisitor.visit(BuildTypeMap.java:244)

at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1198)

at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse(CompilationUnitDeclaration.java:687)

at com.google.gwt.dev.jjs.impl.BuildTypeMap.createPeersForNonTypeDecls(BuildTypeMap.java:637)

at com.google.gwt.dev.jjs.impl.BuildTypeMap.exec(BuildTypeMap.java:514)

at com.google.gwt.dev.jjs.impl.BuildTypeMap.exec(BuildTypeMap.java:523)

at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:599)

at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:33)

at com.google.gwt.dev.Precompile.precompile(Precompile.java:284)

at com.google.gwt.dev.Precompile.precompile(Precompile.java:233)

at com.google.gwt.dev.Precompile.precompile(Precompile.java:145)

at com.google.gwt.dev.Compiler.run(Compiler.java:232)

at com.google.gwt.dev.Compiler.run(Compiler.java:198)

at com.google.gwt.dev.Compiler$1.run(Compiler.java:170)

at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:88)

at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:82)

at com.google.gwt.dev.Compiler.main(Compiler.java:177)

      [ERROR] <no source info>: public interface java.awt.datatransfer.ClipboardOwner

extends java.lang.Object

/*   methods   */

public abstract void lostOwnership(java.awt.datatransfer.Clipboard, java.awt.datatransfer.Transferable) 

         org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding

      [ERROR] at CopyPaste.java(11): class CopyPaste extends Object 

         com.google.gwt.dev.jjs.ast.JClassType

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