[rules-users] Drools and OSGi

[Wouter Van Isterdael]

I have done the following:

- Created a new Project in Eclipse, "Plug-in from existing jar archives" :
added the .jar files of the lib directory in
org.drools.eclipse-5.1.0.SNAPSHOT.zip.<https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/org.drools.eclipse-5.1.0.SNAPSHOT.zip>
- Created a new project: droolstest, based on the example code in
SimpleOsgiTest.
- This is the code:

        @SuppressWarnings("unchecked")
        public void testCompiler() throws Exception {
            ServiceReference serviceRef = bundleContext.getServiceReference(
ServiceRegistry.class.getName() );
            ServiceRegistry registry = (ServiceRegistry)
bundleContext.getService( serviceRef );

           * KnowledgeBuilderFactoryService knowledgeBuilderFactoryService =
registry.get( KnowledgeBuilderFactoryService.class );*

            KnowledgeBaseFactoryService knowledgeBaseFactoryService =
registry.get( KnowledgeBaseFactoryService.class );
            ResourceFactoryService resourceFactoryService = registry.get(
ResourceFactoryService.class );

            String str = "";
            str += "package org.test\n";
            str += "import org.test.Person\n";
            str += "global java.util.List list\n";
            str += "rule rule1\n";
            str += "when\n";
            str += "    $p : Person( age > 30 )\n";
            str += "then\n";
            str += "    list.add($p);\n";
            str += "end\n";

            KnowledgeBuilderConfiguration kbConf =
knowledgeBuilderFactoryService.newKnowledgeBuilderConfiguration( null,


getClass().getClassLoader() );

            KnowledgeBuilder kbuilder =
knowledgeBuilderFactoryService.newKnowledgeBuilder( kbConf );
            ResourceFactoryService resource = resourceFactoryService;
            kbuilder.add( resource.newByteArrayResource( str.getBytes() ),
                          ResourceType.DRL );

            if ( kbuilder.hasErrors() ) {
                System.out.println( kbuilder.getErrors() );
                throw new RuntimeException( kbuilder.getErrors().toString()
);
            }

            KnowledgeBaseConfiguration kbaseConf =
knowledgeBaseFactoryService.newKnowledgeBaseConfiguration( null,


getClass().getClassLoader() );

            KnowledgeBase kbase =
knowledgeBaseFactoryService.newKnowledgeBase( kbaseConf );
            kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
            StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();
            List list = new ArrayList();
            ksession.setGlobal( "list",
                                list );

            ksession.insert( new Person( "name",
                                         34 ) );

            ksession.fireAllRules();
            ksession.dispose();


        }

        public class Person
        {
            private String name;
            private int age;


            public Person(String name, int age)
            {
                this.name = name;
                this.age = age;
            }
        }

The other methods work fine. I then added the following packages to my
dependencies in the manifest:

Import-Package: org.drools,
 org.drools.builder,
 org.drools.builder.impl,
 org.drools.io,
 org.drools.rule,
 org.drools.rule.builder,
 org.drools.runtime,
 org.drools.runtime.rule,
 org.drools.util,
 org.drools.vsm;version="5.1.0.SNAPSHOT",
 org.osgi.framework;version="1.5.0"

However, when I run I get this error:
Testing compiler
org.osgi.framework.BundleException: Activator start error in bundle
droolstest [2].
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:1751)
    at org.apache.felix.framework.Felix.startBundle(Felix.java:1622)
    at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:915)
    at
org.apache.felix.shell.impl.StartCommandImpl.execute(StartCommandImpl.java:114)
    at
org.apache.felix.shell.impl.Activator$ShellServiceImpl.executeCommand(Activator.java:286)
    at
org.apache.felix.shell.tui.Activator$ShellTuiRunnable.run(Activator.java:184)
    at java.lang.Thread.run(Unknown Source)
*Caused by: java.lang.IllegalArgumentException: Unable to instantiate
service for Class 'org.drools.builder.KnowledgeBuilderFactoryService'*
    at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:157)
   * at droolstest.Activator$SimpleOsgiTest.testCompiler(Activator.java:79)*
    at droolstest.Activator.start(Activator.java:44)
    at
org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:639)
    at org.apache.felix.framework.Felix.activateBundle(Felix.java:1700)
    ... 6 more
Caused by: java.lang.ClassCastException
    at java.lang.Class.cast(Unknown Source)
    at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:155)
    ... 10 more
java.lang.IllegalArgumentException: Unable to instantiate service for Class
'org.drools.builder.KnowledgeBuilderFactoryService'
->

The registry is not null. He just can't seem to find this service. Allthough
the drools project with all bundles of the lib directory in
org.drools.eclipse-5.1.0.SNAPSHOT.zip.<https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/org.drools.eclipse-5.1.0.SNAPSHOT.zip>are
installed and started. (this should register the service I believe)

These issues have been driving me crazy. :-(

Kind regards

Aerv
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