You debug SQLJ code by debugging the SQLJ source directly, not the generated Java code.
SQLJ is debugged in JDeveloper in the same manner as other source code.
For more information, see the Oracle Database SQLJ Developer's Guide
and Reference, available from the Oracle Database 10g
Documentation Library on the Oracle Technology Network (OTN) at
http://www.oracle.com/pls/db92/db92.homepage
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Debugging a Project in JDeveloper
Embedding SQL in Java Programs with SQLJ
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