RPC Error after GWT 2.3 upgrade

After upgrading to GWT 2.3 some of my RPC services no longer work and fail with "The response could not be deserialized". It seems to happen to services that are returning objects that are use Date objects that are annotated with @Temporal(TemporalType.TIMESTAMP). I use Gilead 1.3.2 and Hibernate 3.6 and I had no issues with GWT 2.2. Any idea what could be going on, or how to start debugging?

Here's the stack trace:

com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: The response could not be deserialized
  at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:221)
  at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java: 287)
  at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
  at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImp l.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597) 
  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:167)
  at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:326)
  at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:207)
  at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:132)
  at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
  at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
  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.apply(Impl.java)
  at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:214)
  at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  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:167)
  at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:281)
  at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:531)
  at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
  at java.lang.Thread.run(Thread.java:680)
Caused by: com.google.gwt.user.client.rpc.SerializationException: java.sql.Timestamp/1769758459
Caused by: com.google.gwt.user.client.rpc.SerializationException: java.sql.Timestamp/1769758459
  at com.google.gwt.user.client.rpc.impl.SerializerBase.getTypeHandler(SerializerBase.java:153)
  at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiate(SerializerBase.java:114)
  at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:111)
  at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
  at com.lensoo.shared.entity.Course_FieldSerializer.deserialize(Course_FieldSerializer.java:320)
  at com.lensoo.shared.entity.Course_FieldSerializer.deserial(Course_FieldSerializer.java:405)
  at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
  at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
  at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
  at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter$ResponseReader$8.read(RequestCallbackAdapter.java:106) 
  at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:214)
  ... 26 more 
  ... 26 more

Solution

I have very similar problem - Gilead 1.3.1, Hibernate. Exception is also complaining on Timestamp field.

Here's something that I found at Gilead's website:

"Timestamp_FieldSerializer that ships with Gilead conflicts with one that was apparently introduced in GWT 2.2 or 2.3"

http://sourceforge.net/tracker/index.php?func=detail&aid=3285026&group_id=239931&atid=1111398

End of "Details" section suggests the easy fix, however, I haven't tried that yet.