尝试使用RPC向客户端抛出异常时出现GWT错误

时间：2013-08-14 15:49:31

标签： exception gwt null

当我尝试使用RPC将服务器上的异常抛出到客户端时，我收到了一些错误。 我有的是： 一个自己的异常类：

package catan.user.session.shared;
public class SessionInvalidException extends Exception {
    private static final long serialVersionUID = 1L;
}

RPC实施。

@SuppressWarnings("serial")
public class ProfileServiceImpl extends RemoteServiceServlet implements ProfileService{

    @Override
    public UserLight getUser() throws SessionInvalidException {
        SessionManager.getInstance().isSessionStillValid(this.getThreadLocalRequest());
        return ((UserLight)     this.getThreadLocalRequest().getSession(false).getAttribute("User")).clone();
    }
}

在SessionManager.getInstance（）中抛出异常.isSessionStillValid（） 当我运行我的程序时，我在日志中得到了以下错误

Wed Aug 14 17:13:45 CEST 2013 catan.client.Catan
WARNING: Exception caught 

catan.user.session.shared.SessionInvalidException: null
at catan.user.session.shared.SessionInvalidException_FieldSerializer.instantiate(SessionInvalidException_FieldSerializer.java:16)
at catan.user.session.shared.SessionInvalidException_FieldSerializer.create(SessionInvalidException_FieldSerializer.java:25)
at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiate(SerializerBase.java:115)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:396)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:216)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:258)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:412)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242)
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Unknown Source)
Aug 14, 2013 5:13:45 PM com.google.gwt.logging.server.RemoteLoggingServiceUtil     logOnServer

WARNING: Exception caught 

com.google.gwt.core.client.impl.SerializableThrowable$ThrowableWithClassName
at catan.user.session.shared.SessionInvalidException_FieldSerializer.instantiate(SessionInvalidException_FieldSerializer.java:16)
at catan.user.session.shared.SessionInvalidException_FieldSerializer.create(SessionInvalidException_FieldSerializer.java:25)
at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiate(SerializerBase.java:115)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:396)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:216)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:258)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:412)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242)
at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Unknown Source)

有趣的事情是我在几乎完全相同的方式抛出的完全相同的包中有另一个例外，只有另一个名字，它有效......我只是不明白我做错了什么... < / p>

2 个答案:

答案 0 :(得分：0)

确保异常类位于* .gwt.xml模块定义文件中的元素指定的路径上。例如：

<!-- Specify the paths for translatable code                    -->
<source path='client' />
<source path='shared' />

答案 1 :(得分：0)

好的，我解决了我的问题。因此，RPC正确地将异常传递给客户端。然后 在onFailure方法中，我将捕获的对象传递给我的Logger类，然后尝试将其发送回Server或其他东西。我不确定这里，因为Logger类是由我的Projekt的另一个成员编写的。所以只是没有使用这个类解决了问题，但我仍然不确定那些错误试图告诉我...如果有人对此感兴趣是方法我传递了被捕获的对象。 Catan.class是我们的EntryPoint类。

public class Logger {

/**
 * Logs a Throwable
 * @param caught
 */
public static void log(Throwable caught) {
    final java.util.logging.Logger log = java.util.logging.Logger.getLogger(Catan.class.getName());
    log.log(Level.WARNING, "Exception caught \n", caught);
}
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