Hi,

I tried to create a RPC service that returns a list of dates (Mainly because GWT does not support Calendar...):

@Remote
public interface DateUtilService {
  List<Date> getDates(final String start, final String end);
}

But when I call this method I get a Class cast expection:

java.lang.ClassCastException: java.lang.Double cannot be cast to java.util.Date
  de.akquinet.zalit.client.ProjectDateTable.getTableHeaders(ProjectDateTable.java:84)
  de.akquinet.zalit.client.ProjectDateTable.init(ProjectDateTable.java:27)
  de.akquinet.zalit.client.ZalitMainApplication$1$1.callback(ZalitMainApplication.java:61)
  de.akquinet.zalit.client.ZalitMainApplication$1$1.callback(ZalitMainApplication.java:1)
  org.jboss.errai.bus.client.api.builder.AbstractRemoteCallBuilder$1$1.callback(AbstractRemoteCallBuilder.java:107)
  org.jboss.errai.bus.client.framework.ClientMessageBusImpl$3.callback(ClientMessageBusImpl.java:223)
  sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  java.lang.reflect.Method.invoke(Method.java:597)
  com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
  com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
  com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
  com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:1714)
  com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:165)
  com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
  com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
  com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:284)
  com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
  org.jboss.errai.bus.client.framework.ClientMessageBusImpl._store(ClientMessageBusImpl.java)
  org.jboss.errai.bus.client.framework.ClientMessageBusImpl.procIncomingPayload(ClientMessageBusImpl.java:1128)
  org.jboss.errai.bus.client.framework.ClientMessageBusImpl.access$7(ClientMessageBusImpl.java:1125)
  org.jboss.errai.bus.client.framework.ClientMessageBusImpl$LongPollRequestCallback.onResponseReceived(ClientMessageBusImpl.java:888)
  com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
  com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:393)
  sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  java.lang.reflect.Method.invoke(Method.java:597)
  com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
  com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
  com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
  com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:1714)
  com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:165)
  com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
  com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
  com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:264)
  com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
  com.google.gwt.core.client.impl.Impl.apply(Impl.java)
  com.google.gwt.core.client.impl.Impl.entry0(Impl.java:188)
  sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  java.lang.reflect.Method.invoke(Method.java:597)
  com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
  com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
  com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
  com.google.gwt.dev.shell.BrowserChannel.reactToMessages(BrowserChannel.java:1669)
  com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:401)
  com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222)
  java.lang.Thread.run(Thread.java:662)

The code at that point is when I iterate through that list:

  private List<String> getTableHeaders(final List<Date> dates) {
    final List<String> result = new ArrayList<String>();
 
    result.add("Projekt");
 
    for (final Date date : dates) {
      result.add(format(date));
    }
 
    return result;
  }

My suspicion is that the complex Date type is mapped to Long during serialization, but not mapped back to a Date object correctly...?

Cheers

  Markus