GWT 中引发 NoSuchMethod 异常
我开始在 OS X 10.5.8 上使用 Eclipse 插件来熟悉最新的 Google Web Toolkit。到目前为止，我已经能够启动并运行客户端，这非常棒。
然而，服务器是另一回事。我正在尝试链接到一个 .jar 文件，该文件包含一些我想在服务器 ServiceImpl 类中使用的类，但它似乎已经陷入了 .jar 的先前迭代中 - 我添加了一个方法，重建了 jar ，从 GWT 项目的构建路径（以及导出）的库选项卡中删除了该 jar，并重新包含了该 jar。不走运 - 我仍然得到：
[WARN] Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract org.gwtapplication.client.LWDocument org.gwtapplication.client.DocumentService.getDocument()' threw an unexpected exception: java.lang.NoSuchMethodError: org.externalmodel.MyReallyValidClass.toSomething()Ljava/lang/String;
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:378)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:581)
...
Caused by: java.lang.NoSuchMethodError: org.externalmodel.MyReallyValidClass.toSomething()Ljava/lang/String;
at org.application.server.DocumentServiceImpl.getDocument(DocumentServiceImpl.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Eclipse 的代码感知在解析 MyReallyValidClass.toSomething() 调用时没有问题，并且对外部模型类的其他调用也没有错误。有什么线索我应该去哪里寻找吗？
I'm starting to get my feet wet in the latest Google Web Toolkit using the Eclipse plugin on OS X 10.5.8. So far I've been able to get the client up and running, which is great.
The server, though, is a different matter. I'm trying to link to a .jar file that has some classes I want to use in a server ServiceImpl class, but it seems to have glommed onto a previous iteration of the .jar - I've added a method, rebuilt the jar, removed the jar from the libraries tab on the GWT project's build path (as well as on the exports) and reincluded the jar. No luck - I'm still getting:
[WARN] Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract org.gwtapplication.client.LWDocument org.gwtapplication.client.DocumentService.getDocument()' threw an unexpected exception: java.lang.NoSuchMethodError: org.externalmodel.MyReallyValidClass.toSomething()Ljava/lang/String;
at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:378)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:581)
...
Caused by: java.lang.NoSuchMethodError: org.externalmodel.MyReallyValidClass.toSomething()Ljava/lang/String;
at org.application.server.DocumentServiceImpl.getDocument(DocumentServiceImpl.java:45)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
Eclipse's code sense has no problems resolving the MyReallyValidClass.toSomething() call, and there are no errors with other calls into the externalmodel classes. Any clue where I should be looking?
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在您的
DocumentServiceImpl类中，添加以下日志：应该告诉您在哪里拾取此 jar。
In your
DocumentServiceImplclass, adding the following log:should tell you where this jar is being picked up.