Q:

SmartGwt causes exception in dev mode when I have separate gwt module for view objects

Kindly guide me to resolve following issue.
I have created a separate GWT module for view entities entities.
Following is the structure of my project:
gwt-application : (Presentation related code resides here and I have used GWT-Platform and SmartGwt) 
gwt-commons-entities : (GWT Module : This will contain entities to be shared between gwt-applicaiton gwt-service-layer)
gwt-service-layer : (Will contain business logic of the application)
I am facing following exception when I run this application in dev mode (Eclipse -> Run As -> Web Application):
(UnknownFileName:-1) 2012-03-26 14:30:47,069 [FATAL] Uncaught Exception:
com.google.gwt.core.client.JavaScriptException: (null): null
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:248)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
    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.entry0(Impl.java:213)
    at sun.reflect.GeneratedMethodAccessor39.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:292)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
    at java.lang.Thread.run(Unknown Source)

I am not getting such exception when I have my entities in gwt-application.
But I will have to make big architectural changes to my application so I have to put view entities in separate module so that it can be shared.
Appreciate for any clues.

A:

Gotcha. Forgot to call toString() for grid's attribute value. Strange thing observed here it throws above mentioned exception in dev mode however it works fine if generated war of GWT application is deployed in tomcat. GWT caused big pain and cost me 3 days to resolve this.

