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POGWT: RPC Failure (StatusCodeException)
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copied!<p>in my project an RPC interface was implemented to communicate between GWT and a server as described here:</p> <p><a href="http://code.google.com/webtoolkit/doc/1.6/DevGuideServerCommunication.html" rel="nofollow">http://code.google.com/webtoolkit/doc/1.6/DevGuideServerCommunication.html</a></p> <p>All the existing methods can be invoked fine, but lately i introduced a new method which when calling it results in an RPC failure:</p> <pre><code>com.google.gwt.user.client.rpc.StatusCodeException: The call failed on the server; see server log for details at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:192) at com.google.gwt.http.client.Request.fireOnResponseReceivedImpl(Request.java:254) at com.google.gwt.http.client.Request.fireOnResponseReceivedAndCatch(Request.java:226) at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:217) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:592) at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103) at com.google.gwt.dev.shell.moz.MethodDispatch.invoke(MethodDispatch.java:80) at org.eclipse.swt.internal.gtk.OS._g_main_context_iteration(Native Method) at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(OS.java:1428) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2840) at com.google.gwt.dev.GWTShell.pumpEventLoop(GWTShell.java:720) at com.google.gwt.dev.GWTShell.run(GWTShell.java:593) at com.google.gwt.dev.GWTShell.main(GWTShell.java:357) </code></pre> <p>(This excecption stacktrace is shown when running in hosted mode).</p> <p>Here's the changes I made:</p> <ol> <li><p>I extended my service interface with the new method:</p> <p>@RemoteServiceRelativePath("myservice") public interface MyService extends RemoteService { // ... Boolean isSomethingValid(String paramToCheck); }</p></li> <li><p>I implemented my method:</p> <p>public class PMyServiceImpl extends GWTSpringController implements MyService { // ...</p> <pre><code>public Boolean isSomethingValid(String paramToCheck) { // do something ... } </code></pre> <p>}</p></li> <li><p>I added the method definition to the asynchronous interface:</p> <p>public interface MyServiceAsync { // ... void isSomethingValid(String paramToCheck, AsyncCallback callback); }</p></li> </ol> <p>That's it. Am I missing anything? Any hints why the RPC failure occurs? In my server log, I can see the following exception:</p> <pre><code>[7/26/11 11:48:16:618 CEST] 0000004a WebApp A SRVE0181I: [myapplication.war] [/istoolset] [Servlet.LOG]: Exception while dispatching incoming RPC call: com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract java.lang.Boolean com.ubs.istoolset.front.fet.gwt.businessmodel.client.service.MyService.isSomethingValid(java.lang.String)' threw an unexpected exception: java.lang.NullPointerException at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:360) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:546) at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:164) at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost(RemoteServiceServlet.java:86) at com.ubs.istoolset.gwt.framework.rpc.GWTSpringController.handleRequest(GWTSpringController.java:48) at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:859) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:793) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:476) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:441) at javax.servlet.http.HttpServlet.service(HttpServlet.java:763) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1146) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:593) at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:534) at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90) at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:764) at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1478) at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:133) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:450) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:508) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:296) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:270) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113) at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165) at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) at com.ibm.io.async.AsyncChannelFuture$1.run(AsyncChannelFuture.java:205) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497) Caused by: java.lang.NullPointerException at com.ubs.istoolset.front.fet.gwt.businessmodel.server.MyServiceImpl.isSomethingValid(MyServiceImpl.java:1906) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:618) at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:527) ... 27 more </code></pre> <p>Any help is very appreciated, thanks!</p>

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