I had the same problem.  Moving gwt-dev-windows.jar to the top of the
classpath (as mentioned in this post
http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/30df92ebad14a73f/7db488fa4673e6ca?lnk=gst&q=NoSuchMethodError+eclipse#7db488fa4673e6ca)
seems to have fixed it.

On Aug 28, 1:09 am, maticpetek <[EMAIL PROTECTED]> wrote:
> Hello,
>     I try to migrate my project from 1.4.62 to GWT 1.5 RC2. But I get
> the bottom error when i build my project with build.xml script (before
> that i replace 'gwt-mac-1.4.62' with 'gwt-mac-1.5.1'). Any idea what
> could be wrong? Thank you.
>
> My environment:
> OS X, 10.5.4
> GWT 1.5 RC 2Eclipse3.4.0
>
> Buildfile: /Users/maticpetek/Desktop/MetaKocka/MetaKockaMain/src/com/
> metakocka/MetaKockaMain/build.xml
> jars:
>     [mkdir] Created dir: /Users/maticpetek/Desktop/MetaKocka/
> MetaKockaMain/@dot/com.metakocka.MetaKockaMain.MetaKockaMain/WEB-INF/
> lib
>       [jar] Building jar: /Users/maticpetek/Desktop/MetaKocka/
> MetaKockaMain/@dot/com.metakocka.MetaKockaMain.MetaKockaMain/WEB-INF/
> lib/MetaKockaMain.jar
> gwt-compile:
>      [java] 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
>      [java]     at com.google.gwt.dev.javac.JdtCompiler
> $CompilerImpl.<init>(JdtCompiler.java:93)
>      [java]     at
> com.google.gwt.dev.javac.JdtCompiler.<init>(JdtCompiler.java:231)
>      [java]     at
> com.google.gwt.dev.javac.JdtCompiler.compile(JdtCompiler.java:193)
>      [java]     at
> com.google.gwt.dev.javac.CompilationState.compile(CompilationState.java:
> 101)
>      [java]     at
> com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:327)
>      [java]     at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:
> 564)
>      [java]     at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:
> 554)
>      [java]     at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:
> 214)
>
> BUILD FAILED
> /Users/maticpetek/Desktop/MetaKocka/MetaKockaMain/src/com/metakocka/
> MetaKockaMain/build.xml:73: Java returned: 1
>
> Total time: 3 seconds
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