So right, the basics, this is running on GWT2.5.0 / JDK1.6 and set up more 
or less as the docs have it set up

*gwt.xml*

<inherits name="com.google.gwt.logging.Logging" />

<set-property name="gwt.logging.simpleRemoteHandler"
value="ENABLED" />
<set-property name="gwt.logging.logLevel" value="INFO" />
<set-property name="gwt.logging.enabled" value="TRUE" />
<set-property name="gwt.logging.developmentModeHandler"
value="ENABLED" />
<set-property name="gwt.logging.systemHandler" value="DISABLED" />
<set-property name="gwt.logging.popupHandler" value="DISABLED" />
<set-property name="gwt.logging.consoleHandler" value="ENABLED" />
<set-property name="gwt.logging.firebugHandler" value="ENABLED" />


and I'm forcing the exception with the following code, just a simple 
NullPointException

         try {
            Level n = null;
            n.getName();
          } catch (NullPointerException ex) {
          
        //SerializableThrowable st = new SerialiableThrowable();
          
            logger.log(Level.SEVERE, "Null Exception Hit", ex);
          }


But for some reason this is thrown when the exception is thrown to the 
server

 [WARN] remoteLogging: An IncompatibleRemoteServiceException was thrown 
while processing this call.
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: Type 
'com.google.gwt.core.client.impl.SerializableThrowable' was not assignable 
to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a 
custom field serializer. For security purposes, this type will not be 
deserialized.
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:323)
at 
com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:206)

According to the docs on remote server logging this should "just work" and 
I don't see why this is getting thrown. It seems to me 
SerializableThrowable should by definition be serializable. I know you 
 have to jump through some hoops to have your own classes be serializable, 
but everything I've read says I should be able to toss exceptions back to 
the server without issue. Any ideas? It looks like since 2.5.0 
serializableThrowable has been moved to 
com.google.gwt.core.shared.SerializableThrowable, 
but I don't think that's doing it.

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