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chobantonov:  can you attach the code that's causing the error?  Otherwise there won't be much we can do aside 
from reading over that code and guessing.

See http://code.google.com/p/google-web-toolkit/issues/detail?id=501
You might want to try 1.2.11

I'm attaching the code that is causing the problem.
Steps to reproduce:
1. Unzip
2. cd test
3. execute the compile script. It should fail with the above exception

compile-problem.zip 440 KB   Download

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Reproduced this.

A fix has been submitted for code review.

patch2-scottb-issue497-r187 9.7 KB   Download

Submitted as r220.

Released in 1.3.3

Hi,
I have tries version 1.3.3 and the problem (seems) is still there:

[exec] Analyzing permutation #1
     [exec] [ERROR] Unexpected internal compiler error
     [exec] com.google.gwt.dev.jjs.impl.InternalCompilerException: Error during dispatch
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.dispatch(GenerateJavaAST.java:322)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.dispProcessStatement(GenerateJavaAST.java:356)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.processMethod(GenerateJavaAST.java:1185)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.processType(GenerateJavaAST.java:288)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST.exec(GenerateJavaAST.java:1971)
     [exec] at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.compile(JavaToJavaScriptCompiler.java:295)
     [exec] at com.google.gwt.dev.GWTCompiler.realizePermutation(GWTCompiler.java:658)
     [exec] at com.google.gwt.dev.GWTCompiler.compilePermutations(GWTCompiler.java:413)
     [exec] at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:337)
     [exec] at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:689)
     [exec] at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:208)
     [exec] Caused by: com.google.gwt.dev.jjs.impl.InternalCompilerException: Error
during dispatch
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.dispatch(GenerateJavaAST.java:322)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.dispProcessExpression(GenerateJavaAST.java:341)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.processStatement(GenerateJavaAST.java:1368)
     [exec] at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
     [exec] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [exec] at java.lang.reflect.Method.invoke(Method.java:585)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.dispatch(GenerateJavaAST.java:310)
     [exec] ... 10 more
     [exec] Caused by: com.google.gwt.dev.jjs.impl.InternalCompilerException: Cannot
create a ThisRef of the appropriate type.
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.createThisRef(GenerateJavaAST.java:1717)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.createThisRef(GenerateJavaAST.java:1678)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.processExpression(GenerateJavaAST.java:961)
     [exec] at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
     [exec] at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     [exec] at java.lang.reflect.Method.invoke(Method.java:585)
     [exec] at
com.google.gwt.dev.jjs.impl.GenerateJavaAST$JavaASTGenerationVisitor.dispatch(GenerateJavaAST.java:310)
     [exec] ... 16 more

Hi lior,

This looks like a completely different problem, and in fact is not reproduced by the
test case chobantanov submitted.  Please enter a new issue and attach the offending
project.

Thanks,
Scott

Using gwt-windows-1.4.60 under NetBeans I get 

<<

init:
deps-clean:
do-clean:
Deleting 4 files from C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\lib
Deleted 1 directory from C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\lib
Deleting directory C:\Documents and Settings\jean\playPlate\build
Deleting directory C:\Documents and Settings\jean\playPlate\dist
check-clean:
clean:
init:
deps-module-jar:
deps-ear-jar:
deps-jar:
Created dir: C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\classes
Created dir: C:\Documents and Settings\jean\playPlate\build\web\META-INF
Copying 1 file to C:\Documents and Settings\jean\playPlate\build\web\META-INF
Copying 13 files to C:\Documents and Settings\jean\playPlate\build\web
library-inclusion-in-archive:
Copying 1 file to C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\lib
Copying 1 file to C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\lib
Copying 1 file to C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\lib
Copying 1 file to C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\lib
library-inclusion-in-manifest:
Compiling 28 source files to C:\Documents and
Settings\jean\playPlate\build\web\WEB-INF\classes
Copying 1 file to C:\Documents and Settings\jean\playPlate\build\web\WEB-INF\classes
Output will be written into C:\Documents and
Settings\jean\playPlate\build\web\org.jean.Main
   Analyzing permutation #1
      [ERROR] An internal compiler exception occurred
com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.
        at com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:538)
        at com.google.gwt.dev.jjs.ast.JVisitor.doTraverse(JVisitor.java:529)
        at
com.google.gwt.dev.jjs.ast.JVisitor.doAcceptWithInsertRemove(JVisitor.java:521)
        at com.google.gwt.dev.jjs.ast.JVisitor.acceptWithInsertRemove(JVisitor.java:81)
        at com.google.gwt.dev.jjs.ast.JClassType.traverse(JClassType.java:50)
        at com.google.gwt.dev.jjs.ast.JVisitor.doTraverse(JVisitor.java:527)
        at com.google.gwt.dev.jjs.ast.JVisitor.doAccept(JVisitor.java:509)
        at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:69)
        at
com.google.gwt.dev.jjs.impl.GenerateJavaScriptAST$CreateNamesAndScopesVisitor.visit(GenerateJavaScriptAST.java:253)
        at com.google.gwt.dev.jjs.ast.JClassType.traverse(JClassType.java:48)
        at com.google.gwt.dev.jjs.ast.JVisitor.doTraverse(JVisitor.java:527)
        at com.google.gwt.dev.jjs.ast.JVisitor.doAccept(JVisitor.java:515)
        at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:77)
        at com.google.gwt.dev.jjs.ast.JProgram.traverse(JProgram.java:699)
        at com.google.gwt.dev.jjs.ast.JVisitor.doTraverse(JVisitor.java:527)
        at com.google.gwt.dev.jjs.ast.JVisitor.doAccept(JVisitor.java:509)
        at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:69)
        at
com.google.gwt.dev.jjs.impl.GenerateJavaScriptAST.execImpl(GenerateJavaScriptAST.java:1783)
        at
com.google.gwt.dev.jjs.impl.GenerateJavaScriptAST.exec(GenerateJavaScriptAST.java:1653)
        at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.compile(JavaToJavaScriptCompiler.java:385)
        at com.google.gwt.dev.GWTCompiler.realizePermutation(GWTCompiler.java:688)
        at com.google.gwt.dev.GWTCompiler.compilePermutations(GWTCompiler.java:411)
        at com.google.gwt.dev.GWTCompiler.distill(GWTCompiler.java:335)
        at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:755)
        at com.google.gwt.dev.GWTCompiler.run(GWTCompiler.java:745)
        at com.google.gwt.dev.GWTCompiler.main(GWTCompiler.java:213)
Caused by: java.lang.NullPointerException
        at java.util.TreeMap.compare(TreeMap.java:1093)
        at java.util.TreeMap.getEntry(TreeMap.java:347)
        at java.util.TreeMap.get(TreeMap.java:265)
        at com.google.gwt.dev.js.ast.JsScope.findExistingNameNoRecurse(JsScope.java:212)
        at com.google.gwt.dev.js.ast.JsScope.declareName(JsScope.java:94)
        at
com.google.gwt.dev.jjs.impl.GenerateJavaScriptAST$CreateNamesAndScopesVisitor.visit(GenerateJavaScriptAST.java:299)
        at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:141)
        at com.google.gwt.dev.jjs.ast.JVisitor.doTraverse(JVisitor.java:527)
        ... 24 more
         [ERROR] at SimpleAnimator.java(75): public abstract void finalize();
         [ERROR] at SimpleAnimator.java(5): abstract class SimpleAnimator extends
Object implements Animator, Rule 
         [ERROR] at FadeIn.java(7): final class FadeIn extends SimpleAnimator 
         [ERROR] <no source info>: <JProgram>
[ERROR] Build failed
C:\Documents and Settings\jean\playPlate\nbproject\build-gwt.xml:13: Java returned: 1

>>

only when i try to compile using the OBFUSCATED flag. Things go fine when using
DETAILED or PRETTY. The code to reproduce this is quite big, I'm trying to reproduce
it without the need of the whole project. Guess it's because of the heavy use of
inheritance and polymorphism.

giancarlo.todone, I believe this is a different issue than the one that was fixed
here.  Can you please file this into a new issue?

Thanks,
Scott

Thanks, the new issue is #1659.