I believe this is a bug. After I remove a rule or package from the ruleBase, newly added rules fail to "see" objects in the working memory. Attached is a test case, and below is the output from it. Drools 4.0.4 Java 1.5.0.13 Start RuleBase created Adding rules about 'tom': package tom; import test.Tester.Record; rule "Find tom" when $rec : Record( field1 == "tom" ) then System.out.println("Find 'tom' " + $rec.dump()); end inserting record 1:"tom", inserting record 2:"fred", inserting record 3:"harry", inserting record 4:"fred", inserting record 5:"ed", inserting record 6:"tom", inserting record 7:"sreeni", inserting record 8:"jill", inserting record 9:"ed", inserting record 10:"tom", fireAllRules() Find 'tom' 10:"tom", Find 'tom' 6:"tom", Find 'tom' 1:"tom", adding rules about 'fred': package fred; import test.Tester.Record; rule "Find fred" when $rec : Record( field1 == "fred" ) then System.out.println("Find 'fred' " + $rec.dump()); end Find 'fred' 4:"fred", Find 'fred' 2:"fred", As expected, 'fred' is found. Removing package tom (same bug if you use "ruleBase.removeRule"). ruleBase.removePackage("tom"); adding rules about 'ed': package ed; import test.Tester.Record; rule "Find ed" when $rec : Record( field1 == "ed" ) then System.out.println("Find 'ed' " + $rec.dump()); end No 'ed' is found! Changing record 3 to 'ed' fireAllRules() Find 'ed' 3:"ed", Only the newly updated 'ed' is found. -- Dirk Bergstrom dirk(a)juniper.net _____________________________________________ Juniper Networks Inc., Computer Geek Tel: 408.745.3182 Fax: 408.745.8905