Ah its also missing a default return value in your generated method:

public <T extends Constructable> T instantiate (String className) {
  if("MyPanel".equals(className)) {
     return (T) new MyPanel();
  }
  .....
  if("MyPanel2".equals(className)) {
     return (T) new MyPanel2();
  }
  ....

  *return null; // no matches*
}


You can also always add the "-gen <path/to/output/folder>" option to your 
compiler args / run configuration. That way GWT will save all generated 
sources in your specified folder and you can actually see what has been 
generated.


-- J.

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