gwt从2.7版升级到2.8版

我正在用gwt开发一个应用程序。 到目前为止，我使用的是gwt版本2.7。 但现在我决定升级到2.8版。 我从网站下载了GWT2.8 并替换了eclipse中的版本。 在运行应用程序（在超级开发模式下）和应用程序编译过程中，出现以下错误：

 [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:111)
    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:118)
    at com.google.gwt.dev.jjs.ast.JCastOperation.traverse(JCastOperation.java:72)
    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:92)
    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.codeserver.Recompiler.doCompile(Recompiler.java:362)
    at com.google.gwt.dev.codeserver.Recompiler.compile(Recompiler.java:175)
    at com.google.gwt.dev.codeserver.Recompiler.recompile(Recompiler.java:134)
    at com.google.gwt.dev.codeserver.Outbox.recompile(Outbox.java:135)
    at com.google.gwt.dev.codeserver.JobRunner.recompile(JobRunner.java:113)
    at com.google.gwt.dev.codeserver.JobRunner.access$000(JobRunner.java:37)
    at com.google.gwt.dev.codeserver.JobRunner$2.run(JobRunner.java:90)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoClassDefFoundError: com/google/gwt/core/ext/typeinfo/HasMetaData
    at com.google.gwt.maps.jsio.rebind.JSWrapperGenerator.hasTag(JSWrapperGenerator.java:129)
    at com.google.gwt.maps.jsio.rebind.TaskFactory$WrapperPolicy.shouldConstruct(TaskFactory.java:221)
    at com.google.gwt.maps.jsio.rebind.TaskFactory.extractMethods(TaskFactory.java:324)
    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$UnifyVisitor.visit(UnifyAst.java:402)
    at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:265)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:361)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:273)
    ... 46 more
Caused by: java.lang.ClassNotFoundException: com.google.gwt.core.ext.typeinfo.HasMetaData
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 64 more
            [ERROR] at EventImpl.java(303): GWT.create(EventImpl.class)
               com.google.gwt.dev.jjs.ast.JMethodCall
            [ERROR] at EventImpl.java(303): (EventImpl) GWT.create(EventImpl.class)
               com.google.gwt.dev.jjs.ast.JCastOperation
            [ERROR] at EventImpl.java(303): final static EventImpl impl = (EventImpl) GWT.create(EventImpl.class)
               com.google.gwt.dev.jjs.ast.JDeclarationStatement
            [ERROR] at EventImpl.java(42): {
  Object.$clinit();
  final static EventImpl impl = (EventImpl) GWT.create(EventImpl.class);
}
               com.google.gwt.dev.jjs.ast.JBlock
            [ERROR] at EventImpl.java(42): {
  Object.$clinit();
  final static EventImpl impl = (EventImpl) GWT.create(EventImpl.class);
}
               com.google.gwt.dev.jjs.ast.JMethodBody
            [ERROR] at EventImpl.java(42): com.google.gwt.maps.client.impl.EventImpl.$clinit()V
               com.google.gwt.dev.jjs.ast.JMethod
      [ERROR] Compiler returned false
      [WARN] recompile failed
      [WARN] continuing to serve previous version

这是我的课程路径

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" path="src"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.launching.macosx.MacOSXType/Java SE 8 [1.8.0_121]"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/dropbox-core-sdk-V2.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/GWT FX v0.5.0 MS 1.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/gwt-charts-0.9.10.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/gwt-maps.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/gwt-visualization.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/gwtbootstrap3-0.9.3.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/gwtexporter-2.5.0-SNAPSHOT.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/gwtphonegap-3.5.0.1.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/jackson-annotations-2.7.0.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/jackson-core-2.7.0.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/jackson-databind-2.7.0.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/jxl.jar"/>
    <classpathentry kind="lib" path="/Users/gallavie/Documents/workspace/eclipseWorkspace/kod-koma/jars/mgwt-2.0.0.jar"/>
    <classpathentry kind="con" path="com.google.appengine.eclipse.core.GAE_CONTAINER"/>
    <classpathentry kind="con" path="com.google.gwt.eclipse.core.GWT_CONTAINER"/>
    <classpathentry kind="output" path="war/WEB-INF/classes"/>
</classpath>

那个
有元数据的接口是（八年前！）和（两年前）

这意味着
com.google.gwt.maps.jsio
已经过时（很久以前的IIRC），现在需要更换。
你能展示一下你的pom.xml吗？我没有，你能解释一下是什么吗，我必须拥有它？pom只是Maven的项目描述符文件，但似乎您没有使用Maven。这似乎是一个版本兼容性问题，除了GWT之外，类路径上还有哪些库？您好，谢谢您的重播。我在问题中添加了类路径。请您删除GWT unitCache文件夹，以确保GWT没有重用任何编译过的文件。另外，如果您使用logLevel TRACE进行编译，您可以获得更好的错误描述您好，谢谢您的重播，但我不明白替换为其他任何支持的Google Maps包装器，该包装器可与GWT 2.8一起使用。（你们gwt maps不是也在使用Google maps API v2吗？它不再受支持了；我也看到了gwt可视化和gwt图表，这些Google API不是也被弃用了吗？看起来你们有一个比gwt依赖项更大的问题：第三方API依赖项）嗨，谢谢你们的重播，但我不认为这是我的问题，因为我打开了一个新项目“Hello world”与GWT 2.8并获得它这个错误和我的新项目不包括谷歌地图和其他LIB再次感谢你，这一定是一个不同的错误，你粘贴的错误特别指向一个类，该类已在2.8中删除（但在2.7中存在），它来自GWT地图。