Before you run your debug-enabled application, replace the optimized jConnect
jconn4.jar file with the debug version
jconn4d.jar, which you can find in the devclasses
subdirectory under your jConnect installation directory.
To set the 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.