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

[Joaquín Díaz Vélez]

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
>>
>>
>>
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>> rules-users mailing list
>> rules-users at lists.jboss.org
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>>
>>
>
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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
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