[rules-users] Drools and OSGi

[Jason Davidson]

I don't know if this helps, but I had to turn the MVEL JIT compiler off in
the Equinox OSGi container:
            OptimizerFactory.setDefaultOptimizer("reflective");

Also, we used pre-compiled packages instead of compiling the DRL files at
runtime.  For example:

....
            RuleBaseConfiguration ruleBaseConfig = new
RuleBaseConfiguration();

ruleBaseConfig.setClassLoader(this.getClass().getClassLoader());

            //MVEL in OSGi is a complete CF - this turns off the MVEL JIT -
potential resource hog but that's the nature of OSGi classloading
            //and Drools...
            OptimizerFactory.setDefaultOptimizer("reflective");

            RuleBase ruleBase =
RuleBaseFactory.newRuleBase(ruleBaseConfig);

            InputStream pkgIs =
this.getClass().getResourceAsStream("/com/cjs/hazel/rules/com.cjs.hazel.rules.pkg");
            addPackage(ruleBase,pkgIs);
.....

On Fri, Apr 2, 2010 at 4:42 PM, AervTerrh <woutervanisterdael at gmail.com>wrote:

>
> Hey,
>
> Okay. I know this problem can be found all over. But I can't seem to figure
> out a solution to it. Somehow I must be doing something wrong. I've created
> a simple application that evaluates some rules and changes some objects
> based on that. Everything worked fine, not a single problem there. All
> libraries could be easily found etc.
>
> Now I wanted to convert this to a Felix OSGi bundle.
>
> So, what I did, was creating a bundle (new plugin project based on existing
> jars) with the drools jars (core, compiler, api, jsr) and tried the next
> code in the RuleEngine class:
>
> Properties props = new Properties();
> props.setProperty("drools.dialect.java.compiler", "JANINO");
> KnowledgeBuilderConfiguration config =
> KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props, null);
> (here's where it fails)
> KnowledgeBuilder kbuilder =
> KnowledgeBuilderFactory.newKnowledgeBuilder(config);
> kbuilder.add(ResourceFactory.newClassPathResource(fileName,
> RuleEngine.class), ResourceType.DRL);
>
> This is pretty much the loading of the rule file. The RuleEngine is started
> in an Activator. The file is found and everything. But I keep getting the
> same error when starting the bundle.
>
> org.drools.RuntimeDroolsException: Unable to load dialect
> 'org.drools.rule.builder.dialect.mvel.MVELDialectConfigurati on:mvel:null'
> at org.drools.compiler.PackageBuilderConfiguration.addDialect(P
> ackageBuilderConfiguration.java:274)
> at org.drools.compiler.PackageBuilderConfiguration.buildDialect
> ConfigurationMap(PackageBuilderConfiguration.java:259)
> at org.drools.compiler.PackageBuilderConfiguration.init(Package
> BuilderConfiguration.java:176)
> at
>
> org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:148)
> at org.drools.builder.impl.KnowledgeBuilderProviderImpl.newKnow
> ledgeBuilderConfiguration(KnowledgeBuilderProviderImpl.java: 21)
> at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuild
> erConfiguration(KnowledgeBuilderFactory.java:68)
> at test.Activator$RuleCreator.createRule(Activator.java:52)
> at test.Activator.start(Activator.java:32)
> at org.apache.felix.framework.util.SecureAction.startActivator(
> SecureAction.java:639)
> at org.apache.felix.framework.Felix.activateBundle(Felix.java:1 700)
> at org.apache.felix.framework.Felix.startBundle(Felix.java:1622 )
> at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.j ava:1077)
> at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl .java:264)
> at java.lang.Thread.run(Unknown Source)
> Caused by: java.lang.ClassNotFoundException:
> org.drools.rule.builder.dialect.mvel.MVELDialectConfiguratio n
> at java.net.URLClassLoader$1.run(Unknown Source)
>
>
> The packages I import in the manifest:
> Import-Package: org.codehaus.janino;version="2.4.3",
> org.drools,
> org.drools.builder,
> org.drools.compiler,
> org.drools.io,
> org.drools.rule,
> org.drools.rule.builder.dialect.java,
> org.drools.rule.builder.dialect.mvel,
> org.osgi.framework;version="1.3.0"
>
> In my target platform I add the the drools project I created (with
> drools-xx.jar (the necessary ones), I also added the following:
> -ant
> -antlr-runtime
> -janino
> -jsr94
> -xstream
>
> But I can't seem to get it working... Does anyone know what can be done
> about this? Or a working example of Drools in Felix OSGi would also be
> helpful.
>
> Any help is very much appreciated, I've been looking into this for days.
>
> Thanks!
>
> Kind regards,
>
> Aerv
> --
> View this message in context:
> http://n3.nabble.com/Drools-and-OSGi-tp694011p694011.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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