Before you run your debug-enabled application, replace the optimized jConnect driver jar file jconn4.jar with the debug version jconn4d.jar, which you can find in the devclasses subdirectory under your jConnect installation directory.
If you use the CLASSPATH environment variable:
For UNIX, replace $JDBC_HOME/classes/jconn4.jar with $JDBC_HOME/devclasses/jconn4d.jar.
For Windows, replace %JDBC_HOME%\classes\jconn4.jar with %JDBC_HOME%\devclasses\jconn4d.jar.
