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POGWT 2.5.0 compiler exception
 

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    <p>Our team tries to upgrade from GWT 2.4.0 to 2.5.0, but now we are facing the problem - the compiler throws an exception. Here is the compiler log:</p> <blockquote> <p>binding: user.agent=safari binding: compiler.useSourceMaps=true binding: locale=en Compiling module app.m8.web.AGM Validating units: Ignored 3 units with compilation errors in first pass. Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors. [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:109) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:276) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:116) at com.google.gwt.dev.jjs.ast.JReturnStatement.traverse(JReturnStatement.java:39) at com.google.gwt.dev.jjs.ast.JModVisitor$ListContextImmutable.traverse(JModVisitor.java:170) at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemoveImmutable(JModVisitor.java:336) at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:83) at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:137) at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:133) at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:82) at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265) at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:426) at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:395) at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265) at com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:902) at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:627) at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:624) at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:33) at com.google.gwt.dev.Precompile.precompile(Precompile.java:278) at com.google.gwt.dev.Precompile.precompile(Precompile.java:229) at com.google.gwt.dev.Precompile.precompile(Precompile.java:141) at com.google.gwt.dev.Compiler.run(Compiler.java:232) at com.google.gwt.dev.codeserver.Recompiler.compile(Recompiler.java:89) at com.google.gwt.dev.codeserver.ModuleState.(ModuleState.java:54) at com.google.gwt.dev.codeserver.CodeServer.start(CodeServer.java:88) at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:51) Caused by: java.lang.ClassCastException: com.google.gwt.dev.jjs.ast.JMethod cannot be cast to com.google.gwt.dev.jjs.ast.JConstructor at com.google.gwt.dev.jjs.ast.JNewInstance.getTarget(JNewInstance.java:56) at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:275) at com.google.gwt.dev.jjs.ast.JNewInstance.traverse(JNewInstance.java:86) at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361) at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273) ... 31 more [ERROR] at Contact_FieldSerializer.java(65): com.google.gwt.dev.jjs.ast.JNewInstance [ERROR] at Contact_FieldSerializer.java(65): com.google.gwt.dev.jjs.ast.JReturnStatement [ERROR] at Contact_FieldSerializer.java(64): com.google.gwt.dev.jjs.ast.JBlock [ERROR] at Contact_FieldSerializer.java(64): com.google.gwt.dev.jjs.ast.JMethodBody [ERROR] at Contact_FieldSerializer.java(64): public static Contact instantiate(SerializationStreamReader streamReader); com.google.gwt.dev.jjs.ast.JMethod [ERROR] Compiler returned false</p> </blockquote> <p>Could anyone suggest a solution?</p>
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    1. COCan you put a breakpoint in `com.google.gwt.dev.jjs.ast.JNewInstance#getTarget` to see what method the `JMethod` represents? Also check your `Contact_FieldSerializer#instantiate` code.
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    2. COThanks for comment, Thomas. The reason was found and now everything works fine. This method wasn't actually a method. We have a class Contact implements Serializable. It must contain default constructor, but instead it has public void Contact() {}. That was the reason. The issue is closed.
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    3. COWould you mind filing an issue (with some code to reproduce if possible): https://code.google.com/p/google-web-toolkit/issues/entry
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