You aren't understanding the issue properly. The callback method you just
mentioned is the onSuccess() method that you override. The issue is when
that method is being called. In production the onSuccess() method is
actually being "deferred" (the word I should have been using) until after
the currently running JS has been completed. In dev mode the onSuccess()
method is being called immediately, aka "inline" with the code that calls
GWT.runAsync().
Try this code yourself if you don't believe me (note I wrote this code here
and has not been checked for compilation errors... at the least it's missing
the onFailure() method):
<code>
public void createAsyncPage(){
final String myString = null;
GWT.runAsync(){
public void onSuccess() {
myString = "GWT is the best!";//this code is ran "later" in production,
but runs immediately in dev mode
}
}
myString.contains("GWT");//this should be a bug, this should result in a null
pointer exception!
//It will be null in production, but not in dev mode!
}
</code>
Someone has already responded to the GWT issue I created and has noted that
this inconsistency has actually been documented in the GWT code with a TODO to
fix it.
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