When running jPDL in JBoss and you want to see the debug logs of jBPM, replace the file
conf/log4j.xml
in the jboss server configuration take with the file
deploy/log4j.xml
in your jPDL distribution. In the suite, the full location
of the file to be replaced is [jpdl.home]/server/server/jbpm/conf/log4j.xml
.