Temp fix for IncompatibleClassChangeError: Found interface JClassType, but class was expected

[Mark 376]

I had some trouble setting up the development environment under OS X,
please see stacktrace below.

My environment:
Eclipse 3.6 for Java EE Dev for OS X
Google App Engine Java SDK 1.4.2
Google Plugin for Eclipse 3.6
Google Web Toolkit SDK 2.2.0 (via Eclipse Update site)
Subversive SVN etc.

The problem I encountered turned out to be this one:
http://code.google.com/p/gwt-platform/issues/detail?id=292
java.lang.IncompatibleClassChangeError: Found interface
com.google.gwt.core.ext.typeinfo.JClassType, but class was expected

As a temporary fix, I added GWT SDK 2.1.1 (source: gwt-2.1.1.zip from
http://code.google.com/p/google-web-toolkit/downloads/list.) as a
alternative separate SDK, which I made the default. I was able to
recompile and start the example workbench.

Hope this helps.
- Mark


[ERROR] Unexpected
java.lang.IncompatibleClassChangeError: Found interface
com.google.gwt.core.ext.typeinfo.JClassType, but class was expected
at
com.google.gwt.inject.rebind.GinjectorGeneratorImpl.validateInjectorClass(GinjectorGeneratorImpl.java:
84)
at
com.google.gwt.inject.rebind.GinjectorGeneratorImpl.generate(GinjectorGeneratorImpl.java:
65)
at
com.google.gwt.inject.rebind.GinjectorGenerator.generate(GinjectorGenerator.java:
47)
at
com.google.gwt.core.ext.GeneratorExtWrapper.generate(GeneratorExtWrapper.java:
48)
at
com.google.gwt.core.ext.GeneratorExtWrapper.generateIncrementally(GeneratorExtWrapper.java:
60)
at
com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:
662)
at
com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:
41)
at com.google.gwt.dev.shell.StandardRebindOracle
$Rebinder.rebind(StandardRebindOracle.java:74)
at
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:
259)
at
com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:
248)
at
com.google.gwt.dev.DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(DistillerRebindPermutationOracle.java:
91)
at
com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.doFindAdditionalTypesUsingRebinds(WebModeCompilerFrontEnd.java:
106)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox
$CompilerImpl.process(AbstractCompiler.java:254)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:
444)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox
$CompilerImpl.compile(AbstractCompiler.java:175)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox
$CompilerImpl.compile(AbstractCompiler.java:288)
at com.google.gwt.dev.jdt.AbstractCompiler$Sandbox$CompilerImpl.access
$400(AbstractCompiler.java:145)
at
com.google.gwt.dev.jdt.AbstractCompiler.compile(AbstractCompiler.java:
632)
at
com.google.gwt.dev.jdt.BasicWebModeCompiler.getCompilationUnitDeclarations(BasicWebModeCompiler.java:
124)
at
com.google.gwt.dev.jdt.WebModeCompilerFrontEnd.getCompilationUnitDeclarations(WebModeCompilerFrontEnd.java:
54)
at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:
517)
at
com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:
35)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:541)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:495)
at com.google.gwt.dev.Precompile.precompile(Precompile.java:407)
at com.google.gwt.dev.Compiler.run(Compiler.java:215)
at com.google.gwt.dev.Compiler.run(Compiler.java:187)
at com.google.gwt.dev.Compiler$1.run(Compiler.java:159)
at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:
87)
at
com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:
81)
at com.google.gwt.dev.Compiler.main(Compiler.java:166)

[Lars Grammel]

Thanks for letting me know - I'll look into it.

Lars

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Lars Grammel
PhD Candidate, University of Victoria
http://larsgrammel.de
http://lgrammel.blogspot.com/
http://twitter.com/lgrammel

[Mark Hissink Muller]

Don't spend too much time on this, but please know that GWT 2.2. will not work yet. 

- M