Re: [rules-dev] Throwing runtimeException 4.0.7 not supposed
You have answered your question yourself: evaluation of patterns is
done whenever a fact is added; salience will only order firings. Thus,
the access person.name.firstName runs into the NPE.
One way to cope with this would be to introduce a Name object which
represents "no name", available as a public static object in Name; use
this to initialize Person objects. This will still let you detect the
absence of a name (name == Name.noName) but it won't run into the NPE
in your second rule.
-W
On 6/12/09, surya_n2007 <surya_n2007(a)yahoo.co.in> wrote:
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_0Eval1Invoker@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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