I am getting ClassCastException only on production code but not on DevMode!

[Mohammad Al Quraian]

Hi,

I am developing multi-module project, each project is by its own a GWT project. 2 of these project throw these exception when I run them. The exception is:

Uncaught java.lang.RuntimeException: java.lang.ClassCastException

The javascript code that throw that is:

function com_google_gwt_core_client_impl_Impl_entry__Lcom_google_gwt_core_client_JavaScriptObject_2Lcom_google_gwt_core_client_JavaScriptObject_2(jsFunction){

  return function(){

    try {

      return com_google_gwt_core_client_impl_Impl_entry0__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2(jsFunction, this, arguments);

    }

     catch (e) {

      throw e;

    }

  }

  ;

}

They are all maven projects with the same structure and dependencies, the home.xml files are similar. I can't figure out what's wrong, especially because they run fine on devmode. The exception happens on all major browsers.

Any idea what's going on?

[Thomas Broyer]

Put a breakpoint on that throw line and look at the jsFunction.

Alternatively, possibly look at the stacktrace of the 'e' exception.

[Mohammad Al Quraian]

Thanks Thomas for replaying. This is the content of the jsFunction:

function (){ handler.onReadyStateChange__Lcom_google_gwt_xhr_client_XMLHttpRequest_2V(_this); }

I know it's a long shot but do you know what might be the problem?

Thanks for your ongoing help, I appreciate it.

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[Thomas Broyer]

Ok, so now you have to determine the type of that handler object. Again I'd recommend looking at the exception stack trace.

Also, if you use GWT 2.6, use -saveSource at compile-time and enable source maps, that way you can debug the Java code in the browser.