JavaScriptException occurs when ListGrid.fetchData invoked in GWT 2.0 dev mode

[ect]

I have problems with
SmartGWT 2.0 and GWT 2.0.1
in development mode. I get a

com.google.gwt.core.client.JavaScriptException: (null): null

when I execute code like the test case below.
I checked it with different environments, and these are the results:
o SmartGWT 1.3 and GWT 1.7 hosted + compiled: works, "done" is logged
o SmartGWT 2.0 and GWT 2.0.1 compiled: works, "done" is logged
o SmartGWT 2.0 and GWT 2.0.1 dev: I get the exception below

    public void onModuleLoad() {
    	
    	final ListGridRecord [] records = new ListGridRecord[1];
    	records[0] = new ListGridRecord();
    	records[0].setAttribute("myAttribute", "attributeValue");
    	
        DataSource ds = new DataSource() {        	        	        	
        	@Override
            protected Object transformRequest(DSRequest dsRequest) {
                DSOperationType opType = dsRequest.getOperationType();
                if (DSOperationType.FETCH == opType) {
                    return records;
                } else {
                	// just for test
                	return null;
                }
        	}
        };
        ds.setClientOnly(true);        
        
        DataSourceTextField name = new DataSourceTextField("myAttribute");
        ds.setFields(name);
        
        TextItem nameItem = new TextItem("myAttribute");
        ListGridField nameGridField = new ListGridField("myAttribute");
        nameGridField.setEditorType(nameItem);
        
        ListGrid listGrid = new ListGrid();
        listGrid.setDataSource(ds);
        listGrid.setFields(nameGridField);
        
        listGrid.fetchData(null, new DSCallback() {
            public void execute(DSResponse response, Object rawData, DSRequest request) {
                Log.debug("done");
            }                    
        });        
        
    }

The exception stack trace is

com.google.gwt.core.client.JavaScriptException: (null): null
 	at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:195)
 	at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
 	at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
 	at com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid(ModuleSpace.java:284)
 	at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107)
 	at com.smartgwt.client.widgets.grid.ListGrid.fetchData(ListGrid.java)
 	at com.ect.gwt.vcb.client.VisualCallflowBuilder.onModuleLoad(VisualCallflowBuilder.java:139)
 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 	at java.lang.reflect.Method.invoke(Method.java:597)
 	at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:369)
 	at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:185)
 	at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:380)
 	at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222)
 	at java.lang.Thread.run(Thread.java:619)

Any ideas?

[ect]

I continued checking the problem and found one solution which might be a hint: When changing the DataSource to just return null for FETCH as can be seen below, the code works. So with the current SmargGWT version, the list grid records returned for FETCH seem to be handled in a different way.

Any ideas what is wrong with the example or what change so that the code works as with SmartGWT 1.3 and GWT 1.7?

        DataSource ds = new DataSource() {        	        	        	
        	@Override
            protected Object transformRequest(DSRequest dsRequest) {
                DSOperationType opType = dsRequest.getOperationType();
                if (DSOperationType.FETCH == opType) {
                    /*                	
                	ListGridRecord [] records = new ListGridRecord[1];
                	records[0] = new ListGridRecord();
                	records[0].setAttribute("myAttribute", "attributeValue");
                	return records;
                	*/
                	return null;
                } else {
                	// just for test
                	return null;
                }
        	}
        };

[ect]

Should I file this as a bug/issue?

[sjivan]

It's on my TODO list but please go ahead and file an issue pointing to this thread.

Sanjiv

[sjivan]

This has been fixed in SVN.

Sanjiv