Unexpected null on the client from DataSource.getDataSource("realtime-data-source")

[JLivermore]

SmartClient Version: SC_SNAPSHOT-2011-01-06/PowerEdition Deployment (built 2011-01-06)

IE9

I have been working on getting a DynamicDSGenerator working in my app, and all is good. Now in another part of the app, where no code changes have been made, I am not able to get a DataSource when I try to use it. It is a more traditional DataSource defined by a *.ds.xml file, and it's been stable and working in the app for quite some time, no changes.

Now all of a sudden, when the call DataSource.getDataSource("realtime-data-source") is called, it returns a NULL. I see in my logfile on the server the DataSource is indeed loaded upon startup:

=== 2013-05-15 12:42:08,956 [84-2] DEBUG XML - Parsed XML from C:\Documents and Settings\smitj01\My Documents\NetBeansProjects\dev\App\build\web\ds\realtime-data-source.ds.xml: 0ms

One details is that my dynamic DataSource that is generated by my DynamicDSGenerator is called first and loads the dynamic DataSource just fine. Then when I go to the other part of the app, the simple call DataSource.getDataSource("realtime-data-source") returns NULL.

The dynamic DataSource generated by DyanmicDSGenerator is not related to my other static realtime-data-source.ds.xml.

Any thoughts?

[JLivermore]

Another detail is this part of the application that is now suddenly having problems with DataSource.getDataSource() is running in a separately spawn browser window than the main app.

To reiterate, this was working just fine before I began using DynamicDSGenerator to generate dynamic data sources.

[JLivermore]

Here is the error in the Console:
[CODE]
[ERROR] Uncaught exception escaped
java.lang.NullPointerException: null
at com.smartgwt.client.widgets.grid.ListGrid.setDataSource(ListGrid.java:12553)
at com.ancerno.tz.client.ui.realtime.TradeDetail.activate(TradeDetail.java:341)
at com.ancerno.tz.client.ui.realtime.TradeDetail$8.onSuccess(TradeDetail.java:221)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:215)
at com.google.gwt.http.client.Request.fireOnResponseReceivedImpl(Request.java:264)
at com.google.gwt.http.client.Request.fireOnResponseReceivedAndCatch(Request.java:236)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:227)
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.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.ie.IDispatchImpl.callMethod(IDispatchImpl.java:126)
at com.google.gwt.dev.shell.ie.IDispatchProxy.invoke(IDispatchProxy.java:155)
at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:294)
at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:194)
at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
at com.google.gwt.dev.SwtHostedModeBase.processEvents(SwtHostedModeBase.java:264)
at com.google.gwt.dev.HostedModeBase.pumpEventLoop(HostedModeBase.java:557)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
[\CODE]

this error is generated when ListGrid.setDataSource(ds) is called, and ds is NULL from DataSource ds = DataSource.getDataSource("realtime-data-source");

[Isomorphic]

This FAQ has basic troubleshooting procedures for this.

In *addition* to the above steps, since you think this might be related to your DynamicDSGenerator, be sure your code is returning null when it is asked for "realtime-data-source".

Note also that "realtime-data-source" is not a valid DataSource ID (they must be identifiers, so "-" is not allowed). You should change this first, although it may or may not be the cause here.