[rules-users] Stateless session commands and ExecutionResults (5.5.0.Final)

Hi folks, Can anyone explain how stateless session execution results should work? Working through the docs and tracing the code, it’s getting a bit confusing. Firstly, according to the user manual, one should be able to insert a list of facts as a Command, and get an instance of ExecutionResults back, which can then be queried. Here’s the example code: StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); Command cmd = CommandFactory.newInsertElements( Arrays.asList( Object[] { new Cheese( "stilton" ), new Cheese( "brie" ), new Cheese( "cheddar" ), }); ExecutionResults bresults = ksession.execute( cmd ); That doesn’t compile, so I fixed it as follows: Command cmd = CommandFactory.newInsertElements( Arrays.asList( new Cheese( "stilton" ), new Cheese( "brie" ), new Cheese( "cheddar" ) )); ExecutionResults bresults = ksession.execute( cmd ); This does now compile, but running it throws a ClassCastException: java.lang.ClassCastException: java.util.ArrayList cannot be cast to org.drools.runtime.ExecutionResults Taking a look through the Drools code, it would appear that Command has a generic type, which in the case of an InsertElementsCommand is: GenericCommand<Collection<FactHandle>> In turn, the execute command in StatelessKnowledgeSessionImpl casts its result to that generic type: public <T> T execute(Command<T> command) { Object o = ((GenericCommand) command).execute( context ); ... return (T) o; So the ClassCastException is because the execute method returns an ArrayList of FactHandle instead of an ExecutionResults. I’m assuming that I must have got the wrong end of the stick somewhere, so what should I be doing to get an ExecutionResults from a stateless session, which I can then query? Cheers, Steve