[rules-users] NPE in Drools JPA Persistence with rules that use Flow

[Edson Tirelli]

    Shannon,

    What is the following method doing?

engine.process(reading);

    Can you please open a JIRA and attach your test case or point me to the
jira reporting this problem if it exists already?

    Thanks,
        Edson


2011/5/23 Shannon Hastings <shannon.hastings at inventrio.com>

> I am using drools 5.2.0.M2 and I still get this error:
>
> Caused by: java.lang.NullPointerException
> at
> org.drools.marshalling.impl.InputMarshaller.readLeftTuple(InputMarshaller.java:469)
>
> Which was reported on drools 5.1.0 JIRA and claimed to be fixed.  I see the
> error when trying to load a session that was persisted that had objects
> inserted that  are time depended and cause rules to fire that use terms from
> flow such as "after".  I only see this error if create a new session, submit
> some facts to it, close it, and then try to reload.  If i do not submit any
> facts to it I do not get the error.  I.E.  If all i do is create the KB with
> my rules I can reload a session from the DB no problem, but if i submit some
> facts and persist the session, then i cannot reload it.  This seems to be an
> issue with the JPA loading of the session that has facts in it that use Flow
> (JBPM).  Any help would be greatly appreciated.  Below are my simple rules
> followed by the test code used to submit the facts:
>
> package com.inventrio.rules.readings
>
>
> import com.inventrio.healthmonitoring.model.*;
>
> declare Reading
>     @role(event)
>     @timestamp(readingTime)
> end
>
> rule "High Blood Pressure"
> when
> $eventA :  Reading(readingType.name == "BPMETER")
> $systolic : Value( this.valueType.name == "SYSTOLIC"  ) from$eventA.values
> $diastolic : Value( this.valueType.name == "DIASTOLIC"  ) from$eventA.values
> eval( $systolic.getLongValue() > 180 && $diastolic.getLongValue() > 120 )
> then
> System.out.println("HIGH BLOOD PRESSURE" );
> end
>
> rule "Weight Trending Up"
> when
> $eventC :  Reading(readingType.name == "WEIGHT" )
> $eventB  : Reading( readingType.name == "WEIGHT" , this after[5s, 1m]
> $eventC )
> $eventA  : Reading( readingType.name == "WEIGHT" , this after[5s, 1m]
> $eventB )
> $weight3 : Value( this.valueType.name == "WEIGHT"  ) from $eventC.values
> $weight2 : Value( this.valueType.name == "WEIGHT"  ) from $eventB.values
> $weight1 : Value( this.valueType.name == "WEIGHT"  ) from $eventA.values
> eval(  $weight3.getDoubleValue().doubleValue() <
> $weight2.getDoubleValue().doubleValue() + 1.0  &&
> $weight2.getDoubleValue().doubleValue() <
> $weight1.getDoubleValue().doubleValue() + 1.0 )
> then
> System.out.println("WEIGHT IS GOING UP" );
> end
>
> rule "Weight Trending Down"
> when
> $eventC :  Reading(readingType.name == "WEIGHT" )
> $eventB  : Reading( readingType.name == "WEIGHT" , this after[5s, 1m]
> $eventC )
> $eventA  : Reading( readingType.name == "WEIGHT" , this after[5s, 1m]
> $eventB )
> $weight3 : Value( this.valueType.name == "WEIGHT"  ) from $eventC.values
> $weight2 : Value( this.valueType.name == "WEIGHT"  ) from $eventB.values
> $weight1 : Value( this.valueType.name == "WEIGHT"  ) from $eventA.values
> eval(  $weight3.getDoubleValue().doubleValue() >
> $weight2.getDoubleValue().doubleValue() + 1.0  &&
> $weight2.getDoubleValue().doubleValue() >
> $weight1.getDoubleValue().doubleValue() + 1.0 )
> then
> System.out.println("WEIGHT IS GOING DOWN" );
> end
>
>
>
> And next is my object i insert before closeing and then trying to reload
> the session.
>
> public void testWeightRules() {
> try {
>
> Reading reading = new Reading();
> reading.setReadingTime(new Date(System.currentTimeMillis()));
> ReadingType type = new ReadingType();
> type.setName("WEIGHT");
> type.setDescription("");
> reading.setReadingType(type);
> Value value = new Value();
> value.setDoubleValue(140.0);
> ValueType valueType = new ValueType();
> valueType.setName("WEIGHT");
> valueType.setDataType(ValueDataType.DOUBLE);
> value.setValueType(valueType);
> reading.getValues().add(value);
> reading.setReadingType(type);
> engine.process(reading);
>
> Thread.sleep(7000);
>
> reading = new Reading();
> reading.setReadingTime(new Date(System.currentTimeMillis()));
> type = new ReadingType();
> type.setName("WEIGHT");
> type.setDescription("");
> reading.setReadingType(type);
> value = new Value();
> value.setDoubleValue(142.0);
> valueType = new ValueType();
> valueType.setName("WEIGHT");
> valueType.setDataType(ValueDataType.DOUBLE);
> value.setValueType(valueType);
> reading.getValues().add(value);
> reading.setReadingType(type);
> engine.process(reading);
>
> Thread.sleep(7000);
>
> reading = new Reading();
> reading.setReadingTime(new Date(System.currentTimeMillis()));
> type = new ReadingType();
> type.setName("WEIGHT");
> type.setDescription("");
> reading.setReadingType(type);
> value = new Value();
> value.setDoubleValue(144.0);
> valueType = new ValueType();
> valueType.setName("WEIGHT");
> valueType.setDataType(ValueDataType.DOUBLE);
> value.setValueType(valueType);
> reading.getValues().add(value);
> reading.setReadingType(type);
> engine.process(reading);
>
> } catch (Throwable t) {
> t.printStackTrace();
> }
> }
>
> Shannon Hastings
>
> Inventrio
> 545 Metro Place South, Suite 475
> Dublin, OH 43017
> *Phone*: (614) 389-2795 x101
> *Fax:* (614) 522-6249
> *Email:* shannon.hastings at inventrio.com
> http://www.inventrio.com
>
>
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> rules-users at lists.jboss.org
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>
>


-- 
  Edson Tirelli
  JBoss Drools Core Development
  JBoss by Red Hat @ www.jboss.com
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