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A Java program is bundled into a jar and deployed to DB2. It's deployed as stored procedure and it works fine.

The question is: where would we look for messages output via System.out.println("debug message");?

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Nowhere.
Restrictions on external routines:

Receiving inputs from the keyboard and displaying outputs to standard output is not possible from external routines. Do not use standard input-output streams. For example:

  • In external Java™ routine code, do not issue the System.out.println() methods.
  • In external C or C++ routine code, do not issue printf().
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