9 Replies Latest reply on Jun 21, 2012 1:19 AM by afilipchik

Drools and Camel

wbailey Jun 7, 2012 6:36 AM

Hi,

I'm evaluating the drools functionality of Fuse ESB enterprise, but I'm having a few problems getting it to work.

I have defined a drools endpoint in a jbi service unit as follows:

I've tried several variations of the to:uri but camel fails to locate the drools endpoint. I am missing something obvious?

I've tried searching for examples on the web but am struggling to find any substantial documentation related to Fuse, camel and drools. Does anyone know of any?

1. Re: Drools and Camel

ffang Jun 7, 2012 8:09 AM (in response to wbailey)

Hi,

In this case you need use camel-jbi component to route message in camel router to jbi endpoint, take a look at to get more details

http://camel.apache.org/jbi.html
Freeman
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2. Re: Drools and Camel

wbailey Jun 7, 2012 8:44 AM (in response to ffang)

Thanks for that, it's very helpful. The thing I'm confused about is that I don't have a jbi endpoint, I have a drools endpoint. Therefore do I need to wrap up the drools endpoint as a JBI endpoint using a from tag?

e.g
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3. Re: Drools and Camel

ffang Jun 7, 2012 8:50 AM (in response to wbailey)

Hi,

should be fine.

Freeman
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4. Re: Drools and Camel

wbailey Jun 7, 2012 9:05 AM (in response to ffang)

I've actually tried that but it resulted in the following exception:

13:51:16,406 | ERROR | l Console Thread | BlueprintContainerImpl           | 9 - org.apache.aries.blueprint - 0.3.1.fuse-7-061 | Unable to start blueprint container for bundle fi-route-camel
org.osgi.service.blueprint.container.ComponentDefinitionException: Unable to intialize bean blueprintContext
     at [19:org.apache.karaf.shell.console:2.2.5.fuse-7-061]
        ...
     at java.lang.Thread.run(Thread.java:619)[:1.6.0_19]
Caused by: org.apache.camel.FailedToCreateProducerException: Failed to create Producer for endpoint: Endpoint[endpoint:droolsTestService]. Reason: java.lang.NullPointerException
     at org.apache.camel.impl.ProducerCache.doGetProducer(ProducerCache.java:381)
        ...
org.apache.aries.blueprint.container.BeanRecipe.runBeanProcInit(BeanRecipe.java:638)[9:org.apache.aries.blueprint:0.3.1.fuse-7-061]
     ... 33 more
Caused by: java.lang.NullPointerException
     at org.apache.servicemix.camel.JbiEndpoint$JbiProducer.start(JbiEndpoint.java:95)
     at org.apache.camel.util.ServiceHelper.startService(ServiceHelper.java:59)
     at org.apache.camel.impl.ProducerCache.doGetProducer(ProducerCache.java:379)
     ... 104 more

5. Re: Drools and Camel

ffang Jun 7, 2012 8:59 PM (in response to wbailey)

Hi,

Per ,the JBI endpoint URI format should be one of
jbi:service:serviceNamespace[sep]serviceName[?options]
jbi:endpoint:serviceNamespace[sep]serviceName[sep]endpointName[?options]
jbi:name:endpointName[?options]

ensure your configuration follow it.
http://camel.apache.org/jbi.html

Freeman
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6. Re: Drools and Camel

wbailey Jun 8, 2012 12:03 PM (in response to ffang)

I got this working but I had to invoke the drools endpoint via http using a http jbi service unit.

To do this I created a drools endpoint in its own su:

This means I can use the service mix drools engine, but I'm a little disappointed having to introduce another http hop. There must be a way to do this without using the jbi http su?

Ideally I want to invoke the jbi endpoint directly from the camel context but everything I try doesn't work. Any help would be much appreciated.
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7. Re: Drools and Camel

davsclaus Jun 9, 2012 6:00 AM (in response to wbailey)

What version of Drools are you using?

The Drools project has native Camel integration, so you ought to be able to leverage that without using JBI at all.
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8. Re: Drools and Camel

ffang Jun 10, 2012 8:42 PM (in response to davsclaus)

Hi,

Yeah, if you start a new project, you should use camel component instead but not the JBI component.

Btw, I don't think you really need introduce another http hop if you use JBI,try the route like

as I mentioned before
Per ,the JBI endpoint URI format should be one of
jbi:service:serviceNamespacesepserviceName?options
jbi:endpoint:serviceNamespacesepserviceNamesependpointName?options
jbi:name:endpointName?options

Here I just use the third format.
http://camel.apache.org/jbi.html
Freeman
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9. Re: Drools and Camel

afilipchik Jun 21, 2012 1:19 AM (in response to ffang)

Just my 2 cents - are you sure Drools is OSGi compatible?

I spent some time trying make drools-camel and drools-spring fully OSGi compatible but didn't find enough time to create required for submission unit tests

You can find patches at https://github.com/afilipchik

Maybe it is obsolete because of FAB, or maybe Jboss folks already pushed fix... Not sure there.
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