I am beginner in JBPM and Drools, and I don't know where I can trace the error messages from the drools engine when I am running my deployed application (Process Model with user tasks and Business Rules). Anybody can tell me please?
Have a look at KnowledgeRuntimeLoggerFactory:
KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "logdir/mylogfile");