[rules-users] Problem with package names and declare section

[Wolfgang Laun]

Today I've reported a similar (?) problem with KnowledgeAgent ind
combination with declare: the type of the inserted wasn't recognized, and
rules didn't fire.

Please check that this produces the correct class name:

rule justTestClass
salience 1000000
when
then
    Event event = new Event();
    System.out.println( event.getName() );
  //   insert( event );
end

If it does, uncomment and try again: Does insert work from DRL?

-W

2012/2/10 Joaquín Díaz Vélez <joaquin.diazvelez at fluxit.com.ar>

> W, thanks for your reply. The Event fields are all complete and
> initialized. If I change the rule package to the one in Event  (let's say
> "package-name(rule) == package-name(Event)") everything works like a charm.
> I'll give you more details about the NPE.
>
> Happends in this class:  org.drools.reteoo.ReteooFactHandleFactory, method:
>
>     protected final InternalFactHandle newFactHandle(final int id,
>                                                      final Object object,
>                                                      final long recency,
>                                                      *final
> ObjectTypeConf conf,*
>                                                      final
> InternalWorkingMemory workingMemory,
>                                                      final
> WorkingMemoryEntryPoint wmEntryPoint) {
>
>         if ( conf != null && conf.isEvent() ) {
> *            TypeDeclaration type = conf.getTypeDeclaration();*
>             long timestamp;
> *            if ( type.getTimestampExtractor() != null ) { --> NPE here,
> because type is null*
>                 if ( Date.class.isAssignableFrom(
> type.getTimestampExtractor().getExtractToClass() ) ) {
>                     timestamp = ((Date)
> type.getTimestampExtractor().getValue( workingMemory,
>
>      object )).getTime();
>         (...) etc
> }
>
> So, *type *is null (shouldn't be). I debugged the execution and I found
> that ObjectTypeConfigurationRegistry is holding this instance of *conf.*
>
> Any ideas?
>
> Thanks in advance
>
>
> 2012/2/9 Wolfgang Laun <wolfgang.laun at gmail.com>
>
>> The NPE during insertion is highly suggestive of another problem. Even if
>> there were two Event classes (one the pojo, the other one the declared one)
>> there should not be a NPE; the "hello world" rule simply would not fire.
>> Are all fields - especially eventName - properly initialized before that
>> fact is inserted?
>>
>> -W
>>
>> 2012/2/9 Joaquín Díaz Vélez <joaquin.diazvelez at fluxit.com.ar>
>>
>>> Hi guys,
>>>
>>>             we are currently working with Drools Fusion in order to
>>> build a complex event processing solution. We've modelled our events using
>>> and object (Event) and this object is shared with everyone that needs to
>>> publish and event.
>>>
>>>             Our scenario goes this way
>>>
>>> 1) Our shared class, located in *ar.com.fluxit.Event*
>>>
>>> 2) An example of our cep rules declared in package *rules.flux*
>>>
>>>     package *rules.flux*
>>>
>>>     import *ar.com.fluxit.Event;*
>>>
>>>     declare *Event*
>>> @role (event)
>>>  @expires(1m)
>>>     end
>>>
>>>     rule "hello world"
>>> when
>>>     $event:Event( eventName == "Hello World") from entry-point "*
>>> rules.flux*"
>>> then
>>>      System.out.println("Hello world");
>>>         end
>>>
>>>
>>> 3) When we try to insert a *ar.com.fluxit.Event *as a fact in entry
>>> point "rules.flux" Drools Fusion throws a NullPointerException. If you read
>>> Drools Expert documentation (
>>> http://docs.jboss.org/drools/release/5.2.0.Final/drools-expert-docs/html/ch05.html#d0e3661
>>>  -
>>> Accessing Declared Types from the Application Code) you find this
>>> paragraph:
>>> "The first important thing to realize is that a declared fact will
>>> belong to the package where it was declared. So, for instance, in the
>>> example below, Person will belong to the org.drools.examples package,
>>> and so the fully qualified name of the generated class will be
>>> org.drools.examples.Person."
>>>
>>> When we change package declaration to *package ar.com.fluxit *everything
>>> works like a charm. But in our cep scenario we need that our
>>> ar.com.fluxit.Event object to be user by all rules declared in any package.
>>>
>>> So, there goes the question. There is a workaround for this? This is a
>>> bug?
>>>
>>> Any help would be very appreciated
>>>
>>>
>>> Cheers
>>>
>>>
>>> --
>>> Joaquín Díaz Vélez
>>>
>>> Flux IT SA
>>> Calle 9 N° 865 - Paseo La Panadería - Planta Alta
>>> La Plata - Buenos Aires - Argentina
>>> Teléfono (+54) 221 553 2980 int 306
>>> Móvil (+54) 9221 5863322
>>>     www.fluxit.com.ar
>>>
>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
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>>
>>
>
>
> --
> Joaquín Díaz Vélez
>
> Flux IT SA
> Calle 9 N° 865 - Paseo La Panadería - Planta Alta
> La Plata - Buenos Aires - Argentina
> Teléfono (+54) 221 553 2980 int 306
> Móvil (+54) 9221 5863322
>     www.fluxit.com.ar
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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