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You have a NullPointerException...are you trying to access any objects which haven't been instantiated? (hint: your definitions of the arr_gen_name and array_class_name)

Perfectly ok...I hope the above explanation and link helps.

Please see the API for Statement. Each Statement can only be associated with a single ResultSet. In you case, you can fix this problem by a) creating 2 Statements and use each for your 2 independent...