[ https://issues.jboss.org/browse/DROOLS-31?page=com.atlassian.jira.plugin.... ] Davide Sottara commented on DROOLS-31: -------------------------------------- You can use KnowledgeBase metadata to see queries and their parameters.. you can then create a "reflective" listener This snippet of code finds all Queries in a KB and retrieves the (internal) descriptor which contains argument info: String packageName = "..."; for ( org.drools.definition.rule.Query k : kbase.getKnowledgePackage( packageName ).getQueries() ) { org.drools.rule.Query q = (org.drools.rule.Query) kbase.getQuery( packageName, k.getName() ); for ( Declaration decl : q.getParameters() ) { System.out.println( decl.getIdentifier() + " : " + decl.getTypeName() ); } } Knowing the parameters, the exception should still be raised in case something goes very wrong -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira