Re: Error when defining a generic Composite widget using Java Generics

Originally, the DualList class inherited from Composite rather that FocusWidget - however, in order to use the DualList together with DataEntry, I had to extend it from FocusWidget.

And I think, that the problem is related to this somehow...

Jip. You have forgotten to set a root element in your DualList. Each Widget in GWT must have such a root element.

You need to call

public DualList() {

  super(Document.get().createDivElement()); // or any other HTML element that fits your needs.

  // ...

}

-- J.

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