10:59 a.m.
I am getting a null pointer exception when I try and use a sliding window.
The rule I'm trying to run is:
$primary : Foo($name : Name) over window length(24)
$prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
$primary))
I am trying to look at the last 24 Foo events and have the rule only trigger
when an event with that name hasn't been seen before. I also get a null
pointer when I try and do a time window and no Foo events happen within the
window. Shouldn't the rule just not fire?
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12:17 p.m.
not sure it's related, but it should be window:length(24) - notice the ":"
!
are you checking the KnowledgeBuilder.hasErrors() method?
Otherwise, could you please post a full failing test case, together with the
version you are using ?
Thanks!
Davide
On 04/18/2013 08:59 AM, burmanator wrote:
I am getting a null pointer exception when I try and use a sliding
window.
The rule I'm trying to run is:
$primary : Foo($name : Name) over window length(24)
$prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
$primary))
I am trying to look at the last 24 Foo events and have the rule only trigger
when an event with that name hasn't been seen before. I also get a null
pointer when I try and do a time window and no Foo events happen within the
window. Shouldn't the rule just not fire?
--
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2:28 p.m.
The missing ":" was just a typo in my transcribing. I'm running my code in
a
virtual machine so I couldn't copy and paste and have to hand type
everything out. I go through and check the knowledge builder for errors by
checking the size of KnowledgeBuilder.getErrors() and if the size is greater
then 0, display the error. However nothing comes up.
I'm running Drools 5.5.0.Final that I just downloaded recently.
the DRL I'm using consists of:
package testing2;
import test2.*;
import java.util.*;
import org.drools.*;
declare Foo
@role(event)
@timestamp(Start)
@duration(Duration)
end
rule test
when
$primary : Foo($name : Name) over window:length(24)
$prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
$primary))
then
System.out.println("Found name: " + $name);
end
The error in the console that gets spit back out is:
java.land.NullPointerException
at org.drools.core.util.index.RightTupleIndexHashTable.remove
(RightTupleIndexHashTable.java : 363)
at org.drools.reteoo.AccumulateNode.retractRightTuple
(AccumulateNode.java : 318)
at org.drools.rule.SlidingLengthWindow.assertFact
(SlidingLengthWindow.java : 116)
at org.drools.rule.BehaviorManager.assertFact (BehaviorManager.java : 94)
at org.drools.reteoo.WindowNode.assertObject (WindowNode.java : 167)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject
(CompositeObjectSinkAdapter.java : 497)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject
(CompositeObjectSinkAdapter.java : 382)
at org.drools.reteoo.ObjectTypeNode.assertObject (ObjectTypeNode.java :
235)
at org.drools.reteoo.EntryPointNode.assertObject (EntryPointNode.java :
240)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 350)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 311)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 903)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 847)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java
: 269)
at test2.Engine2.main (ngine2.java : 78)
that last line points to my main class where I add the events into the
knowledge session.
When I change "over window:length(24)" to "over window:time(21d)" (my
sample
data is about 22 days old now) I get the error:
org.drools.RuntimeDroolsException : Unexpected exception executing action
org.drools.rule.SlidingTimeWIndow$BehaviorExpireWMAction@491cc367
at org.drools.common.AbstractWorkingMemory.executeQueuedActions
(AbstractWorkingMemory.java : 995)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 362)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.jaba : 311)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 903)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 847)
at org.drools.impl.StatefulKnowledgeSessionImpl.insert
(StatefulKnowledgeSessionImpl.java : 269)
at test2.Engine2.main (Engine2.java : 78)
Caused by: java.lang.NullPointerException
at
org.drools.core.util.index.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java
: 363)
at org.drools.reteoo.AccumulateNode.retractRightTuple
(AccumulateNode.java : 318)
at org.drools.rule.SlidingTimeWindow.expireFacts(SlidingTimeWindow.java :
189)
at org.drools.rule.SlidingTimeWindow$BehaviorExpireWMAction.execute
(SlidingTimeWindow.java : 471)
at org.drools.common.AbstractWorkingMemory.executeQueuedActions
(AbstractWorkingMemory.java : 993)
... 6 more
When I get rid of any over window statements, everything runs just fine.
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3:56 p.m.
Thanks, reproduced.
I will raise a blocker JIRA
Davide
On 04/18/2013 12:28 PM, burmanator wrote:
The missing ":" was just a typo in my transcribing. I'm
running my code in a
virtual machine so I couldn't copy and paste and have to hand type
everything out. I go through and check the knowledge builder for errors by
checking the size of KnowledgeBuilder.getErrors() and if the size is greater
then 0, display the error. However nothing comes up.
I'm running Drools 5.5.0.Final that I just downloaded recently.
the DRL I'm using consists of:
package testing2;
import test2.*;
import java.util.*;
import org.drools.*;
declare Foo
@role(event)
@timestamp(Start)
@duration(Duration)
end
rule test
when
$primary : Foo($name : Name) over window:length(24)
$prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
$primary))
then
System.out.println("Found name: " + $name);
end
The error in the console that gets spit back out is:
java.land.NullPointerException
at org.drools.core.util.index.RightTupleIndexHashTable.remove
(RightTupleIndexHashTable.java : 363)
at org.drools.reteoo.AccumulateNode.retractRightTuple
(AccumulateNode.java : 318)
at org.drools.rule.SlidingLengthWindow.assertFact
(SlidingLengthWindow.java : 116)
at org.drools.rule.BehaviorManager.assertFact (BehaviorManager.java : 94)
at org.drools.reteoo.WindowNode.assertObject (WindowNode.java : 167)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject
(CompositeObjectSinkAdapter.java : 497)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject
(CompositeObjectSinkAdapter.java : 382)
at org.drools.reteoo.ObjectTypeNode.assertObject (ObjectTypeNode.java :
235)
at org.drools.reteoo.EntryPointNode.assertObject (EntryPointNode.java :
240)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 350)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 311)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 903)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 847)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java
: 269)
at test2.Engine2.main (ngine2.java : 78)
that last line points to my main class where I add the events into the
knowledge session.
When I change "over window:length(24)" to "over window:time(21d)" (my
sample
data is about 22 days old now) I get the error:
org.drools.RuntimeDroolsException : Unexpected exception executing action
org.drools.rule.SlidingTimeWIndow$BehaviorExpireWMAction@491cc367
at org.drools.common.AbstractWorkingMemory.executeQueuedActions
(AbstractWorkingMemory.java : 995)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 362)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.jaba : 311)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 903)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 847)
at org.drools.impl.StatefulKnowledgeSessionImpl.insert
(StatefulKnowledgeSessionImpl.java : 269)
at test2.Engine2.main (Engine2.java : 78)
Caused by: java.lang.NullPointerException
at
org.drools.core.util.index.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java
: 363)
at org.drools.reteoo.AccumulateNode.retractRightTuple
(AccumulateNode.java : 318)
at org.drools.rule.SlidingTimeWindow.expireFacts(SlidingTimeWindow.java :
189)
at org.drools.rule.SlidingTimeWindow$BehaviorExpireWMAction.execute
(SlidingTimeWindow.java : 471)
at org.drools.common.AbstractWorkingMemory.executeQueuedActions
(AbstractWorkingMemory.java : 993)
... 6 more
When I get rid of any over window statements, everything runs just fine.
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8:07 p.m.
I have identified the problem and submitted a tentative patch:
I guess it will be discussed and (hopefully) integrated early next week
If you want, you can try and apply it yourself
https://github.com/sotty/drools/commit/c949ef0195ad174fadae6369985fa17d46...
On 04/18/2013 12:28 PM, burmanator wrote:
The missing ":" was just a typo in my transcribing. I'm
running my code in a
virtual machine so I couldn't copy and paste and have to hand type
everything out. I go through and check the knowledge builder for errors by
checking the size of KnowledgeBuilder.getErrors() and if the size is greater
then 0, display the error. However nothing comes up.
I'm running Drools 5.5.0.Final that I just downloaded recently.
the DRL I'm using consists of:
package testing2;
import test2.*;
import java.util.*;
import org.drools.*;
declare Foo
@role(event)
@timestamp(Start)
@duration(Duration)
end
rule test
when
$primary : Foo($name : Name) over window:length(24)
$prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
$primary))
then
System.out.println("Found name: " + $name);
end
The error in the console that gets spit back out is:
java.land.NullPointerException
at org.drools.core.util.index.RightTupleIndexHashTable.remove
(RightTupleIndexHashTable.java : 363)
at org.drools.reteoo.AccumulateNode.retractRightTuple
(AccumulateNode.java : 318)
at org.drools.rule.SlidingLengthWindow.assertFact
(SlidingLengthWindow.java : 116)
at org.drools.rule.BehaviorManager.assertFact (BehaviorManager.java : 94)
at org.drools.reteoo.WindowNode.assertObject (WindowNode.java : 167)
at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject
(CompositeObjectSinkAdapter.java : 497)
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject
(CompositeObjectSinkAdapter.java : 382)
at org.drools.reteoo.ObjectTypeNode.assertObject (ObjectTypeNode.java :
235)
at org.drools.reteoo.EntryPointNode.assertObject (EntryPointNode.java :
240)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 350)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 311)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 903)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 847)
at
org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java
: 269)
at test2.Engine2.main (ngine2.java : 78)
that last line points to my main class where I add the events into the
knowledge session.
When I change "over window:length(24)" to "over window:time(21d)" (my
sample
data is about 22 days old now) I get the error:
org.drools.RuntimeDroolsException : Unexpected exception executing action
org.drools.rule.SlidingTimeWIndow$BehaviorExpireWMAction@491cc367
at org.drools.common.AbstractWorkingMemory.executeQueuedActions
(AbstractWorkingMemory.java : 995)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 362)
at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.jaba : 311)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 903)
at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java : 847)
at org.drools.impl.StatefulKnowledgeSessionImpl.insert
(StatefulKnowledgeSessionImpl.java : 269)
at test2.Engine2.main (Engine2.java : 78)
Caused by: java.lang.NullPointerException
at
org.drools.core.util.index.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java
: 363)
at org.drools.reteoo.AccumulateNode.retractRightTuple
(AccumulateNode.java : 318)
at org.drools.rule.SlidingTimeWindow.expireFacts(SlidingTimeWindow.java :
189)
at org.drools.rule.SlidingTimeWindow$BehaviorExpireWMAction.execute
(SlidingTimeWindow.java : 471)
at org.drools.common.AbstractWorkingMemory.executeQueuedActions
(AbstractWorkingMemory.java : 993)
... 6 more
When I get rid of any over window statements, everything runs just fine.
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10:48 p.m.
On 18/04/2013, burmanator <alexburman(a)gmail.com> wrote:
rule test
when
$primary : Foo($name : Name) over window:length(24)
$prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
$primary))
then
System.out.println("Found name: " + $name);
end
Apart from the sliding window and the manifest bug: I just wonder why
nobody has pointed out that the rule can be rewritten as:
rule test
when
$primary : Foo($name : Name) over window:length(24)
not Foo(Name == $name, this before $primary)
then
System.out.println("Found name: " + $name);
end
There is no other way the list size can be less than 1 :-)
-W
12:43 a.m.
Wolfgang,
I was expecting you to do that :)
Btw, I don't know the requirements, but I wonder if some window
filter or temporal horizon (i.e. before[x,y]) shouldn't be applied to
the second pattern too... the use of a plain "before" requires to
keep all events in the WM since the beginning of time
On 04/19/2013 08:48 PM, Wolfgang Laun wrote:
On 18/04/2013, burmanator <alexburman(a)gmail.com> wrote:
> rule test
> when
> $primary : Foo($name : Name) over window:length(24)
> $prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before
> $primary))
> then
> System.out.println("Found name: " + $name);
> end
>
Apart from the sliding window and the manifest bug: I just wonder why
nobody has pointed out that the rule can be rewritten as:
rule test
when
$primary : Foo($name : Name) over window:length(24)
not Foo(Name == $name, this before $primary)
then
System.out.println("Found name: " + $name);
end
There is no other way the list size can be less than 1 :-)
-W
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10:25 a.m.
I tried using not Foo(Name == $name, this before $primary) however the
desired final implementation of code would be looking for multiple matching
fields more along the lines of:
rule test
when
$primary : Foo($name : Name, $data : Data) over window:length(24)
not Foo(Name == $name, Data == $data, this before $primary)
then
System.out.println("Found name: " + $name);
end
and because of this, if either Name or Data didn't match, the whole
statement would undesirably trigger as true.
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10:36 a.m.
"," behaves as "and", so that is not unexpected :)
You can use boolean operators to control your logic, e.g.:
not Foo( name == $name || data == $data, this before $primary )
We'd need to know the logic of the "desired final implementation"..
Davide
On 04/24/2013 08:25 AM, burmanator wrote:
I tried using not Foo(Name == $name, this before $primary) however
the
desired final implementation of code would be looking for multiple matching
fields more along the lines of:
rule test
when
$primary : Foo($name : Name, $data : Data) over window:length(24)
not Foo(Name == $name, Data == $data, this before $primary)
then
System.out.println("Found name: " + $name);
end
and because of this, if either Name or Data didn't match, the whole
statement would undesirably trigger as true.
--
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4035
days old
8 comments
3 participants
participants (3)
-
burmanator -
Davide Sottara -
Wolfgang Laun