I’m having some difficulty getting a rule flow with a stateless session to work. Essentially, it is just executing the first task and then stops. I’m using Drools 5.1.1 and I just built the sample Drools by creating a new Drools Project.

My rule flow is simple: Start-RuleGroup1-RuleGroup2-End

I use the 2 rules from example, putting the “Hello World” in RuleGroup1 and “Goodbye” in RuleGroup2.

Here’s my code to run it:

// load up the knowledge base

KnowledgeBase kbase = readKnowledgeBase();

StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession();

KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test");

// start a new process instance

Message message = new Message();

message.setMessage("Hello World");

message.setStatus(Message.HELLO);

ArrayList cmds = new ArrayList();

ArrayList dataList = new ArrayList();

dataList.add(message);

cmds.add(CommandFactory.newInsertElements(dataList));

cmds.add(CommandFactory.newStartProcess("com.sample.ruleflow"));

ksession.execute(CommandFactory.newBatchExecution(cmds));

logger.close();

When I run the rules, all I get is “Hello World” (no “Goodbye cruel world”). It does work with a Stateful Session using insert, startProcess, and fireAllRules, but this is a test using the rule flows with CommandFactory functionality, something we need for an application we are developing.