It's not an obvious how to OSGI-fy something :)
I did some homework - now I have OSGi-ified versions of drools-spring and
drools-camel.
Also I created own bundle and tried to import KnowledgeBaseFactoryService,
ServiceRegistry and KnowledgeBaseFactoryService as described in
.
All what I got - NullPointerException from karaf core (haven't gotten full
staketrace yet. For some reason it is just:
15:11:34,484 | INFO | l Console Thread | Console
| ? ? | 34 -
org.apache.karaf.shell.console - 2.2.2.fuse-02-13 | Exception caught while
executing command
java.lang.NullPointerException
)
So, I spent some time randomly adding and removing configuration params and
I found - NPE occurs when I'm trying to import
org.drools.KnowledgeBaseFactoryService.
I guess (i'm not OSGI expert) it could be because org.drools package is
exported in 2! bundles. It is in drools-core and knowledge-api bundles. And
I guess, karaf container just can't link my bundle with both core and api,
only first bundle which contains requested package (org.drools) wins.
Any ideas on how to make it work?
I actually have one - every bundle should export own package. For
knowledge-api it should be org.drools.api, and org.drools.core for
drools-core.
Here is full log of similar packages:
WARNING: multiple bundles are exporting package org.drools.command
- org.drools.core [218]
- org.drools.api [216]
- org.drools.internalapi [217]
WARNING: multiple bundles are exporting package org.drools.runtime.process
- org.drools.core [218]
- org.drools.api [216]
WARNING: multiple bundles are exporting package org.drools.time
- org.drools.core [218]
- org.drools.api [216]
WARNING: multiple bundles are exporting package
org.apache.geronimo.transaction
- org.apache.aries.transaction.manager [123]
- org.apache.aries.transaction.manager [51]
WARNING: multiple bundles are exporting package org.drools
- org.drools.core [218]
- org.drools.api [216]
WARNING: multiple bundles are exporting package
org.apache.geronimo.transaction.manager
- org.apache.aries.transaction.manager [123]
- org.apache.aries.transaction.manager [51]
WARNING: multiple bundles are exporting package org.drools.grid
- org.drools.core [218]
- org.drools.spring [220]
WARNING: multiple bundles are exporting package jline
- org.apache.servicemix.bundles.jruby [210]
- org.apache.karaf.shell.console [34]
WARNING: multiple bundles are exporting package
org.apache.geronimo.transaction.log
- org.apache.aries.transaction.manager [123]
- org.apache.aries.transaction.manager [51]
WARNING: multiple bundles are exporting package org.drools.management
- org.drools.core [218]
- org.drools.api [216]
WARNING: multiple bundles are exporting package org.drools.agent
- org.drools.core [218]
- org.drools.api [216]
WARNING: multiple bundles are exporting package org.drools.event
- org.drools.core [218]
- org.drools.api [216]
2012/2/3 Mark Proctor <mproctor(a)codehaus.org>
neither spring or camel have been OSGi-ified. only api, core,
compiler,
templates, decision-tables and flow have.
If someone wants to OSGi-ify those and contribute back they are very
welcome:
1) update the pom.xml to use the osgi bundle plugin, see other existing
poms.
https://github.com/droolsjbpm/drools/blob/master/drools-decisiontables/po...
2) create an Activator to register the module, again see Activator's for
core, compiler etc.
https://github.com/droolsjbpm/drools/blob/master/drools-decisiontables/sr...
3) update the osgi bundle's pom with new dependencies, make sure to pull
in the spring ones, unless the actual project provides osgi ready jars.
https://github.com/droolsjbpm/droolsjbpm-build-distribution/tree/master/d...
4) Update the boot-bundles.properties so that Spring DM loads the OSGi
dependencies
https://github.com/droolsjbpm/droolsjbpm-build-distribution/blob/master/d...
5) write unit tests for spring and camel.
Mark
On 03/02/2012 03:47, Alexander Filipchik wrote:
Hello all!
Don't know if it is right list to ask, but I'm trying to make drools +
camel running on Fuse (ServiceMix container).
I couldn't even install OSGI drools artifacts for 5.3.1 version (because
of weird dependency on drools.core Snapshot),
but did it with v5.2.1. I used:
mvel2/2.1.0,
org.drools/drools-core/5.2.1.Final, org.drools/drools-compiler/5.2.1.Final,
org.drools/knowledge-api/5.2.1.Final
and org.drools/drools-camel/5.2.1.Final.
All are installed and active. Part of log:
[ 162] [Active ] [ ] [ ] [ 60] Drools :: Compiler
(5.2.1.Final)
[ 163] [Active ] [ ] [ ] [ 60] mvel2 (2.1.0.drools4)
[ 164] [Active ] [ ] [ ] [ 60] Drools :: Core
(5.2.1.Final)
[ 165] [Active ] [ ] [ ] [ 60] Knowledge API
(5.2.1.Final)
[ 172] [Active ] [ ] [ ] [ 60]
mvn:org.drools/drools-camel/5.2.1.Final
Then I tried to add my own camel-drools router (I created OSGI bundle for
it). It depends on:
Import-Package:
org.apache.activemq,org.apache.activemq.camel.component,org.apache.activemq.pool,org.apache.camel;version="[2.8,3)",org.apache.camel.builder;version="[2.8,3)",org.apache.camel.component.jms;version="[2.8,3)",org.apache.camel.model;version="[2.8,3)",org.drools.camel.component,org.osgi.service.blueprint;version="[1.0.0,2.0.0)",org.springframework.transaction;version="[3,4)"
It tried to install it to a container but all I got -
Error executing command: Unresolved constraint in bundle
com.betfair.drools [170]: Unable to resolve 170.0: missing requirement
[170.0] package; (package=org.drools.camel.component)
I even tried to put drools-camel.jar with org.drools.camel.component in a
lib folder and add package to org.osgi.framework.system.packages.extra, but
got same result.
Do you have any idea, blog posts, samples which could help me?
I'm completely stuck.
Thanks,
Alex
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