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  1. ,
    Expert tip

    A few things cause this exception:
    1) Check if you have all jars and if they're in the correct path.
    2) Your classpath might be broken, you can define it in the command line with java -cp yourClassPath or at your IDE if you're using one.

  2. ,

    you can change your scala version to 2.11.11

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java.lang.ClassNotFoundException: com.google.gwt.core.ext.typeinfo.HasMetaData	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at com.google.gwt.maps.jsio.rebind.JSWrapperGenerator.hasTag(JSWrapperGenerator.java:129)	at com.google.gwt.maps.jsio.rebind.TaskFactory$FlyweightPolicy.shouldBind(TaskFactory.java:155)	at com.google.gwt.maps.jsio.rebind.TaskFactory.extractMethods(TaskFactory.java:309)	at com.google.gwt.maps.jsio.rebind.JSWrapperGenerator.generate(JSWrapperGenerator.java:314)	at com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)	at com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:745)	at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:103)	at com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:78)	at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:262)	at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:251)	at com.google.gwt.dev.PrecompilationContextCreator$1.getAllPossibleRebindAnswers(PrecompilationContextCreator.java:86)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createStaticRebindExpression(UnifyAst.java:519)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createRebindExpression(UnifyAst.java:487)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.maybeHandleMagicMethodCall(UnifyAst.java:415)	at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.visit(UnifyAst.java:402)	at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:265)	at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:118)	at com.google.gwt.dev.jjs.ast.JCastOperation.traverse(JCastOperation.java:76)	at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)	at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:265)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:118)	at com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:49)	at com.google.gwt.dev.jjs.ast.JModVisitor$ListContext.traverse(JModVisitor.java:88)	at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemove(JModVisitor.java:331)	at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:94)	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:139)	at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:135)	at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.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.JModVisitor.accept(JModVisitor.java:265)	at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:786)	at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:778)	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:1401)	at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:896)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.unifyJavaAst(JavaToJavaScriptCompiler.java:1410)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.constructJavaAst(JavaToJavaScriptCompiler.java:1222)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:1140)	at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:255)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:255)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:202)	at com.google.gwt.dev.Precompile.precompile(Precompile.java:143)	at com.google.gwt.dev.Compiler.compile(Compiler.java:204)	at com.google.gwt.dev.Compiler.compile(Compiler.java:155)	at com.google.gwt.dev.Compiler.compile(Compiler.java:144)	at com.google.gwt.dev.Compiler$1.run(Compiler.java:118)	at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)	at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)	at com.google.gwt.dev.Compiler.main(Compiler.java:125)