From: <webtier_at_javadesktop.org>
Date: Wed, 14 Apr 2010 18:47:51 PDT

Maybe it is cause by HashMap<String, Object>!

Try to define a Interface ICategory;
And then define a type implements the interface.

HashMap<String, ? extends Icategory>

:)
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http://forums.java.net/jive/thread.jspa?messageID=397029