Throwing runtime exception in this example inserted person object as person
name is null. Ideally need to add error
"P01" and in second rule checks for precondition "P01" exist and skip rule.
But i am getting the below error.
Please let me know this is bug, i dont want to check again "Second Rule"
name object is not null.
I think this is happening since drools frist try to run all rules before
start execution.
please let me know whether anything wrong on my end.
Rule Engine COde :
Person person = test.new Person();
// Name name = person.new Name();
// person.setName(name);
workingMemory.insert(person);
rule "First Rule" salience 100 lock-on-active true
when
person : Person()
eval(person.name == null)
then
person.errors.add("P01");
System.out.println("Rule 1 invoked"+person.errors);
update(person);
end
rule "Second Rule" salience 99 lock-on-active true
when
person : Person()
eval(!person.errors.contains("P01"))
eval(person.name.firstName=="Bob")
then
person.name.suffix="Mr";
System.out.println("Rule 2 invoked");
end
org.drools.RuntimeDroolsException:
com.sample.rule_second_rule_0eval1invo...@4b42aa1e :
java.lang.NullPointerException
at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:82)
at
org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java:148)
at
org.drools.reteoo.SingleTupleSinkAdapter.propagateAssertTuple(SingleTupleSinkAdapter.java:29)
at
org.drools.reteoo.EvalConditionNode.assertTuple(EvalConditionNode.java:157)
at
org.drools.reteoo.CompositeTupleSinkAdapter.createAndPropagateAssertTuple(CompositeTupleSinkAdapter.java:73)
at
org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:116)
at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:22)
at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162)
at org.drools.reteoo.Rete.assertObject(Rete.java:175)
at
org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:192)
at
org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:71)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:911)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:883)
at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:684)
at com.sample.DroolsTest.main(DroolsTest.java:36)
Caused by: java.lang.NullPointerException
at com.sample.Rule_Second_Rule_0.eval1(Rule_Second_Rule_0.java:14)
at
com.sample.Rule_Second_Rule_0Eval1Invoker.evaluate(Rule_Second_Rule_0Eval1Invoker.java:20)
at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:77)
... 14 more
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