Try with this : rule "hello rule" when There is a Customer with first name "David" then Greet Customer end and this DSL : ---------------------------------------------------------------------------------------------------- [condition][]There is a Customer with first name {name}=$customer : Customer(firstName == {name}) [consequence][]Greet Customer=System.out.println("Hello " + $customer.getFirstName()); ----------------------------------------------------------------------------------------------------- Of course your DSLR file is dependent of the DSL. Without the DSL, Drools cannot guess what you want to do. 2014-03-21 14:12 GMT+01:00 ankit3j <ankit3j(a)gmail.com&gt;: Contents of Sample.dsl ---------------------------------------------------------------------------------------------------- [condition][]There is a Customer with first name "{name}"=$customer : Customer(firstName == {name}) [consequence][]Greet Customer=System.out.println("Hello " + $customer.getFirstName()); ----------------------------------------------------------------------------------------------------- Personally, I don't think its dependent on DSL contents as I have not yet compiled anything. From my point of view, my DSLR file is still independent of whatever DSL I am using. -- View this message in context: http://drools.46999.n3.nabble.com/Not-able-to-detect-how-to-correct-ERR-1... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Maxime FALAIZE _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Yes Maxime, still the same error. -- View this message in context: http://drools.46999.n3.nabble.com/Not-able-to-detect-how-to-correct-ERR-1... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Yes Maxime. They both are in same folder. -- View this message in context: http://drools.46999.n3.nabble.com/Not-able-to-detect-how-to-correct-ERR-1... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

The corrected version of dsl and dslr works fine. ----------- [condition][]There is a Customer with first name {name}= $customer : Customer(firstName == {name}) [consequence][]Greet Customer= System.out.println("Hello " + $customer.getFirstName()); ----------- package dsltest; rule "hello rule" when There is a Customer with first name "David" then Greet Customer end ------------ You don't have to write the DSL all in one line. (I fixed that some time ago.) The error message suggests that translation fails. 1) Make sure the DSLR is *exactly* as above. (The package could be different, and there is tolerance w.r.t. spacing between words.) 2) ALWAYS print builder errors (see below). 3) Make sure you pass resources correctly to the builder. This is how it is done for 5.x: KnowledgeBaseConfiguration kBaseConfig = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(); KnowledgeBuilderConfiguration kbConfig = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(); KnowledgeBuilder kBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( kbConfig ); Resource dsl = ResourceFactory.newFileResource( dslPath ); Resource dslr = ResourceFactory.newFileResource( dslrPath ); long t0 = System.currentTimeMillis(); kBuilder.add( dsl, ResourceType.DSL ); kBuilder.add( dslr, ResourceType.DSLR ); if( kBuilder.hasErrors() ){ System.err.println( ">>> compilation errors >>>" ); KnowledgeBuilderErrors errors = kBuilder.getErrors(); for( KnowledgeBuilderError err: errors ){ System.err.println( err.getMessage() ); } System.err.println( "<<< compilation errors <<<" ); throw new IllegalStateException( "compile errors" ); } kBase = KnowledgeBaseFactory.newKnowledgeBase( kBaseConfig ); kBase.addKnowledgePackages( kBuilder.getKnowledgePackages() ); kSession = kBase.newStatefulKnowledgeSession(); -W