InternalCompilerException: Error constructing Java AST

[fpizzichillo]

Hello folks, I updated from GWT 2.7.0 to 2.8.0 and GWT Maven plugin from 2.7.0 to 2.8.0 and got this error

[ERROR] com.google.gwt.dev.jjs.InternalCompilerException: Error constructing Java AST
[ERROR] at com.google.gwt.dev.jjs.impl.GwtAstBuilder.translateException(GwtAstBuilder.java:3099)
[ERROR] at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:352)
[ERROR] at org.eclipse.jdt.internal.compiler.ast.AllocationExpression.traverse(AllocationExpression.java:670)
[ERROR] at org.eclipse.jdt.internal.compiler.ast.ReturnStatement.traverse(ReturnStatement.java:373)
[ERROR] at org.eclipse.jdt.internal.compiler.ast.Block.traverse(Block.java:141)
[ERROR] at org.eclipse.jdt.internal.compiler.ast.IfStatement.traverse(IfStatement.java:283)
[ERROR] at org.eclipse.jdt.internal.compiler.ast.IfStatement.traverse(IfStatement.java:283)
[ERROR] at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:347)
[ERROR] at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1379)
[ERROR] at com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:3058)
[ERROR] at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:141)
[ERROR] at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:384)
[ERROR] at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:470)
[ERROR] at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:985)
[ERROR] at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:339)
[ERROR] at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:580)
[ERROR] at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:513)
[ERROR] at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:499)
[ERROR] at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:668)
[ERROR] at com.google.gwt.dev.codeserver.Recompiler.initWithoutPrecompile(Recompiler.java:200)
[ERROR] at com.google.gwt.dev.codeserver.Outbox.maybePrecompile(Outbox.java:82)
[ERROR] at com.google.gwt.dev.codeserver.Outbox.(Outbox.java:61)
[ERROR] at com.google.gwt.dev.codeserver.CodeServer.makeOutboxes(CodeServer.java:156)
[ERROR] at com.google.gwt.dev.codeserver.CodeServer.start(CodeServer.java:118)
[ERROR] at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:91)
[ERROR] at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:50)
[ERROR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR] at java.lang.reflect.Method.invoke(Method.java:498)
[ERROR] at com.google.gwt.dev.shell.SuperDevListener$1.run(SuperDevListener.java:84)
[ERROR] Caused by: java.lang.NullPointerException
[ERROR] at com.google.gwt.dev.jjs.impl.ReferenceMapper.get(ReferenceMapper.java:99)
[ERROR] at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.pushNewExpression(GwtAstBuilder.java:2642)
[ERROR] at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:350)

Any hints?
Regards

[rluble]

I am guessing you have some old gwt jars in your classpath. The line numbers in the exception trace don't match up against 2.8.

[fpizzichillo]

You're right @rluble . I had gwt-dev 2.7.0 on classpath.