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https://jira.jboss.org/jira/browse/JBRULES-2278?page=com.atlassian.jira.p...
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Edson Tirelli commented on JBRULES-2278:
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Nestor,
You are using the java dialect, so using the above snippet you will get the following
errors:
Rule Compilation error total cannot be resolved
total cannot be resolved
total cannot be resolved
total cannot be resolved
Syntax error on token ";", delete this token
That is because in java all variables must be explicitly typed ("int total") and
the result block must not have a ";". If you change your rule to the following:
$t2: Number(intValue > 3) from accumulate(TestModel( test == "2", id !=
$t1.id, this after [0s,1m] $t1)
from entry-point "MyEntryPoint",
init( int total = 0; ),
action( total++; ),
reverse( total--; ),
result( total ))
It works just fine. Another alternative is to use "mvel" dialect in which case
you don't need to explicitly type the variables, nor use ";" on each
expression:
rule "Your Second Rule"
no-loop true
dialect "mvel"
when
$t1: TestModel( test == "2" ) from entry-point "MyEntryPoint"
$t2: Number(intValue > 3) from accumulate(TestModel( test == "2", id !=
$t1.id, this after [0s,1m] $t1)
from entry-point "MyEntryPoint",
init( total = 0 ),
action( total++ ),
reverse( total-- ),
result( total ))
That also works fine for me.
As I mentioned before, I am testing against trunk, using the attached example. I believe
you might be seeing the exceptions, but I need to reproduce in order to understand what is
happening.
Thanks,
Edson
NPE after knowledgebase updated when using entrypoints
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Key: JBRULES-2278
URL:
https://jira.jboss.org/jira/browse/JBRULES-2278
Project: Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Components: drools-core, drools-core (expert), drools-core (fusion)
Affects Versions: 5.0.1.FINAL
Reporter: Michael Neale
Assignee: Edson Tirelli
Fix For: 5.1.0.M2
Attachments: kagent-problem.zip
Raised by Nestor Burriel on the dev list:
I've tried to configure my rule engine obtaining unexpected behaviour.
I configure my statefulSession as follows:
wm = (ReteooStatefulSession) ((KnowledgeBaseImpl) kagent
.getKnowledgeBase()).ruleBase.newStatefulSession(
(SessionConfiguration) sessionConf, env);
ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
And after updating the KnowledgeBase in the agent I update my ksession:
wm.setRuleBase((InternalRuleBase) ((KnowledgeBaseImpl) kagent
.getKnowledgeBase()).ruleBase);
ksession = new StatefulKnowledgeSessionImpl(wm, kagent.getKnowledgeBase());
Without using entry-points this approach works as expected, but using them
it fails after the first update throwing the error:
Exception while processing message: java.lang.NullPointerException
java.lang.NullPointerException
at
org.drools.reteoo.ReteooFactHandleFactory.newFactHandle(ReteooFactHandleFactory.java:54)
at
org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:79)
at
org.drools.common.AbstractFactHandleFactory.newFactHandle(AbstractFactHandleFactory.java:66)
at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:109)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28)
Browsing the drools core code I found the line that was throwing the
exception and tried to get the same result by implementing:
if (!((InternalRuleBase) ((KnowledgeBaseImpl)
ksession.getKnowledgeBase()).ruleBase)
.getTypeDeclaration(fact.getClass()) ==
null)
log.info (((InternalRuleBase) ((KnowledgeBaseImpl)
ksession.getKnowledgeBase()).ruleBase)
.getTypeDeclaration(fact.getClass()).getTimestampExtractor().toString());
after updating my ksession. The result was the same, again the same
exception thrown but my logger wrote:
18:01:50,232 INFO [ClassFieldExtractor class=MyPackage.MyFact
field=myTimestampField]
So I dont know why the core is throwing that exception, is that
implementation correct?, any ideas?
Thanks,
Nestor
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