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Sorry, i forgot to post versions.
jboss-4.2.0 which uses
solved this problem ... i'm processing a Set of different labels, therefore the merged data need not to be flushed before processing the next query (it does not affect the results).
Just for those who are interested in the solution ....
see http://java.sun.com/javaee/5/docs/api/javax/persistence/FlushModeType.html for details ...