I found the conflicting class in these jar files:
    - jasper-compiler-jdt.jar
    - jasper-jdt.jar

The jasper-jdt.jar is a standard jar file shipped with Tomcat 6.0 in the 
lib directory.

Once I removed those jar files from my classpath, the problem went away 
for me.

Tom


Deep wrote:
> Thanks Tom.
>
> I didn't get this part "Check your GWT project build path for that jar
> file and remove it.". What needs to be removed?
>
> On Nov 6, 9:28 pm, Tom Hjellming <[EMAIL PROTECTED]> wrote:
>   
>> I had this same problem last month when I moved to GWT 1.5.2 also.
>>
>> It turned out to be a conflict between GWT's dev library and the Jasper
>> 2 JSP engine which apparently uses the Eclipse JDT Java compiler.  The
>> jasper-compiler-jdt.jar had conflicting versions of the
>> org.eclipse.jdt.internal.compiler.Compiler class.  Check your GWT
>> project build path for that jar file and remove it.
>>
>> Hope this helps...
>>
>> Tom
>>
>> Deep wrote:
>>     
>>> I'm using Mac OS 10.5.5 & Eclipse 3.3.2 and I migrated my project from
>>> GWT 1.4.61 to 1.5.2 and getting following error. Please help me.
>>>       
>>> INFO] [gwt:compile {execution: default}]
>>> Exception in thread "main" java.lang.NoSuchMethodError:
>>> org.eclipse.jdt.internal.compiler.Compiler.<init>(Lorg/eclipse/jdt/
>>> internal/compiler/env/INameEnvironment;Lorg/eclipse/jdt/internal/
>>> compiler/IErrorHandlingPolicy;Lorg/eclipse/jdt/internal/compiler/impl/
>>> CompilerOptions;Lorg/eclipse/jdt/internal/compiler/
>>> ICompilerRequestor;Lorg/eclipse/jdt/internal/compiler/
>>> IProblemFactory;)V
>>>         at com.google.gwt.dev.javac.JdtCompiler
>>> $CompilerImpl.<init>(JdtCompiler.java:93)
>>>         at com.google.gwt.dev.javac.JdtCompiler.<init>(JdtCompiler.java:231)
>>>         at 
>>> com.google.gwt.dev.javac.JdtCompiler.compile(JdtCompiler.java:193)
>>>         at
>>> com.google.gwt.dev.javac.CompilationState.compile(CompilationState.java:
>>> 115)
>>>         at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:327)
>>>         at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:564)
>>>         at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:554)
>>>         at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:214)
>>> Exception in thread "main" java.lang.NoSuchMethodError:
>>> org.eclipse.jdt.internal.compiler.Compiler.<init>(Lorg/eclipse/jdt/
>>> internal/compiler/env/INameEnvironment;Lorg/eclipse/jdt/internal/
>>> compiler/IErrorHandlingPolicy;Lorg/eclipse/jdt/internal/compiler/impl/
>>> CompilerOptions;Lorg/eclipse/jdt/internal/compiler/
>>> ICompilerRequestor;Lorg/eclipse/jdt/internal/compiler/
>>> IProblemFactory;)V
>>>         at com.google.gwt.dev.javac.JdtCompiler
>>> $CompilerImpl.<init>(JdtCompiler.java:93)
>>>         at com.google.gwt.dev.javac.JdtCompiler.<init>(JdtCompiler.java:231)
>>>         at 
>>> com.google.gwt.dev.javac.JdtCompiler.compile(JdtCompiler.java:193)
>>>         at
>>> com.google.gwt.dev.javac.CompilationState.compile(CompilationState.java:
>>> 115)
>>>         at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:327)
>>>         at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:564)
>>>         at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:554)
>>>         at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:214)
>>> Exception in thread "main" java.lang.NoSuchMethodError:
>>> org.eclipse.jdt.internal.compiler.Compiler.<init>(Lorg/eclipse/jdt/
>>> internal/compiler/env/INameEnvironment;Lorg/eclipse/jdt/internal/
>>> compiler/IErrorHandlingPolicy;Lorg/eclipse/jdt/internal/compiler/impl/
>>> CompilerOptions;Lorg/eclipse/jdt/internal/compiler/
>>> ICompilerRequestor;Lorg/eclipse/jdt/internal/compiler/
>>> IProblemFactory;)V
>>>         at com.google.gwt.dev.javac.JdtCompiler
>>> $CompilerImpl.<init>(JdtCompiler.java:93)
>>>         at com.google.gwt.dev.javac.JdtCompiler.<init>(JdtCompiler.java:231)
>>>         at 
>>> com.google.gwt.dev.javac.JdtCompiler.compile(JdtCompiler.java:193)
>>>         at
>>> com.google.gwt.dev.javac.CompilationState.compile(CompilationState.java:
>>> 115)
>>>         at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:327)
>>>         at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:564)
>>>         at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:554)
>>>         at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:214)
>>>       
> >   


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