[rules-users] Drools 5.4.0.FINAL and OSGI. Unable to instantiate service for Class 'org.drools.concurrent.ExecutorProvider'
Per Sterner
pelle711 at yahoo.de
Tue May 29 09:30:21 EDT 2012
Hello,
I have been using Drools 5.3.0.FINAL until now. I am upgrading my
running system with 5.4.0.FINAL. The bundles are all runing. I got some
error messages and tried to reduce the problem and created a simple bundle.
The code only inserts facts and after 20 facts I get the following error:
[ERROR] [System] - Exception in thread "Thread-8"
java.lang.ExceptionInInitializerError
[ERROR] [System] - at
org.drools.concurrent.ExecutorProviderFactory.getExecutorProvider(ExecutorProviderFactory.java:12)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint$ExecutorHolder.<clinit>(MvelConstraint.java:208)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint.jitEvaluator(MvelConstraint.java:199)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:164)
[ERROR] [System] - at
org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:124)
[ERROR] [System] - at
org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
[ERROR] [System] - at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
[ERROR] [System] - at
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
[ERROR] [System] - at
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:337)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:123)
[ERROR] [System] - at
org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:53)
[ERROR] [System] - at
de.pelle7.drools.test1.simpletest.SimpleTestDrools$1.run(SimpleTestDrools.java:74)
[ERROR] [System] - Caused by: java.lang.IllegalArgumentException: Unable
to instantiate service for Class 'org.drools.concurrent.ExecutorProvider'
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:162)
[ERROR] [System] - at
org.drools.concurrent.ExecutorProviderFactory$ExecutorProviderHolder.<clinit>(ExecutorProviderFactory.java:8)
[ERROR] [System] - ... 14 more
[ERROR] [System] - Caused by: java.lang.IllegalArgumentException: Unable
to instantiate 'org.drools.concurrent.ExecutorProviderImpl'
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:213)
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:205)
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:160)
[ERROR] [System] - ... 15 more
[ERROR] [System] - Caused by: java.lang.ClassNotFoundException:
org.drools.concurrent.ExecutorProviderImpl
[ERROR] [System] - at
org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506)
[ERROR] [System] - at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
[ERROR] [System] - at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
[ERROR] [System] - at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
[ERROR] [System] - at java.lang.ClassLoader.loadClass(Unknown Source)
[ERROR] [System] - at java.lang.Class.forName0(Native Method)
[ERROR] [System] - at java.lang.Class.forName(Unknown Source)
[ERROR] [System] - at
org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:210)
[ERROR] [System] - ... 17 more
The Rule file:
package de.pelle7.drools.test1.users.rules.impl;
import de.pelle7.drools.test1.simpletest.*;
import org.jbpm.ruleflow.instance.*;
rule "Funny Rule #1"
dialect "java"
when
$testObject : TestObjectA( value == 0 ) from entry-point "my_entry"
then
System.err.println("New Item: " + $testObject);
retract($testObject);
end
If I change the line
--> $testObject : TestObjectA( value == 0 ) from entry-point "my_entry"
to
--> $testObject : TestObjectA( ) from entry-point "my_entry"
there is no problem.
In the java code i initialize a Drools Session programatically and add
one rule file:
package de.pelle7.drools.test1.simpletest;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseConfiguration;
import org.drools.KnowledgeBaseFactoryService;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderConfiguration;
import org.drools.builder.KnowledgeBuilderFactoryService;
import org.drools.builder.ResourceType;
import org.drools.definition.KnowledgePackage;
import org.drools.io.ResourceFactory;
import org.drools.io.ResourceFactoryService;
import org.drools.runtime.StatefulKnowledgeSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class SimpleTestDrools {
public static final String DEFAULT_ENTRY = "my_entry";
private static Logger logger =
LoggerFactory.getLogger(SimpleTestDrools.class);
private StatefulKnowledgeSession droolsSession;
private KnowledgeBuilderFactoryService
droolsKnowledgeBuilderFactoryService;
private ResourceFactoryService droolsResourceFactoryService;
private KnowledgeBaseFactoryService droolsKnowledgeBaseFactoryService;
public static Logger getLogger() {
return logger;
}
public StatefulKnowledgeSession getDroolsSession() {
return droolsSession;
}
public void start() {
KnowledgeBuilder kbuilder =
getDroolsKnowledgeBuilderFactoryService().newKnowledgeBuilder();
KnowledgeBaseConfiguration config =
getDroolsKnowledgeBaseFactoryService().newKnowledgeBaseConfiguration();
//config.setOption( MBeansOption.ENABLED );
KnowledgeBase knowledgeBase =
getDroolsKnowledgeBaseFactoryService().newKnowledgeBase(config);
droolsSession = knowledgeBase.newStatefulKnowledgeSession();
LinkedList<URI> resourcesList = new LinkedList<URI>();
try {
resourcesList.add(
getClass().getResource("MyDrools.drl").toURI() );
addResources(droolsSession,
getDroolsKnowledgeBuilderFactoryService(),
resourcesList);
} catch (Exception e) {
e.printStackTrace();
}
new Thread() {
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
}
System.out.println("Go 1");
for (int i = 0; i< 1000; i++) {
System.out.println(i);
getDroolsSession().getWorkingMemoryEntryPoint(DEFAULT_ENTRY).insert(new
TestObjectA());
getDroolsSession().fireAllRules();
try {
Thread.sleep(1);
} catch (InterruptedException e) {
}
}
System.out.println("Go 2");
};
}.start();
System.err.println("wait");
//getDroolsSession().fireUntilHalt();
}
public static void addResources(
StatefulKnowledgeSession droolsSession,
KnowledgeBuilderFactoryService
droolsKnowledgeBuilderFactoryService,
List<URI> resources
) throws MyDroolsException {
getLogger().debug("Drools: Register: " + resources);
MyDroolsException exception = null;
KnowledgeBuilderConfiguration lnowledgeBuilderConfiguration =
droolsKnowledgeBuilderFactoryService.newKnowledgeBuilderConfiguration();
HashSet<URI> defects = new HashSet<URI>();
KnowledgeBuilder kbuilder = null;
while (true) {
URI uriError = null;
kbuilder =
droolsKnowledgeBuilderFactoryService.newKnowledgeBuilder(lnowledgeBuilderConfiguration);
try {
Iterator<URI> it = resources.iterator();
while (it.hasNext()) {
URI uri = (URI) it.next();
if (defects.contains(uri)) {
continue;
}
StringBuilder builder = new StringBuilder();
builder.append("Adding drools file '" +
uri.toString() + "'");
URL url = uri.toURL();
InputStream iStream = url.openStream();
ResourceType resourceType;
String path = uri.getPath().toLowerCase();
resourceType =
ResourceType.determineResourceType(path);
getLogger().debug(builder.toString());
kbuilder.add(ResourceFactory.newInputStreamResource(iStream), resourceType);
// Check the builder for errors
if (kbuilder.hasErrors()) {
uriError = uri;
//getLogger().error(kbuilder.getErrors().toString());
String errorMessage =
kbuilder.getErrors().toString();
kbuilder.getErrors().clear();
throw new MyDroolsException(errorMessage);
}
try {
iStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
} catch (Throwable e) {
if (uriError != null) {
defects.add(uriError);
}
String msg = "Error in Resource '" + uriError + "'";
getLogger().error(msg);
e.printStackTrace();
if (exception != null) {
exception = new MyDroolsException(msg, exception);
} else {
exception = new MyDroolsException(msg);
}
exception = new MyDroolsException(e.getMessage(),
exception);
continue;
}
// All done!
break;
}
final Collection<KnowledgePackage> pkgs =
kbuilder.getKnowledgePackages();
droolsSession.getKnowledgeBase().addKnowledgePackages(pkgs);
if (exception != null) {
throw new MyDroolsException("Error while adding
resources!", exception);
}
}
public KnowledgeBuilderFactoryService
getDroolsKnowledgeBuilderFactoryService() {
return droolsKnowledgeBuilderFactoryService;
}
public void setDroolsKnowledgeBuilderFactoryService(
KnowledgeBuilderFactoryService
droolsKnowledgeBuilderFactoryService) {
this.droolsKnowledgeBuilderFactoryService =
droolsKnowledgeBuilderFactoryService;
}
public ResourceFactoryService getDroolsResourceFactoryService() {
return droolsResourceFactoryService;
}
public void setDroolsResourceFactoryService(
ResourceFactoryService droolsResourceFactoryService) {
this.droolsResourceFactoryService = droolsResourceFactoryService;
}
public KnowledgeBaseFactoryService
getDroolsKnowledgeBaseFactoryService() {
return droolsKnowledgeBaseFactoryService;
}
public void setDroolsKnowledgeBaseFactoryService(
KnowledgeBaseFactoryService
droolsKnowledgeBaseFactoryService) {
this.droolsKnowledgeBaseFactoryService =
droolsKnowledgeBaseFactoryService;
}
}
Some of the bundles in my runtime are:
39 ACTIVE org.drools.core_5.4.0.Final
66 ACTIVE org.drools.compiler_5.4.0.Final
78 ACTIVE org.drools.templates_5.4.0.Final
94 ACTIVE org.drools.internalapi_5.4.0.Final
136 ACTIVE org.drools.decisiontables_5.4.0.Final
189 ACTIVE org.drools.api_5.4.0.Final
191 ACTIVE org.mvel2_2.1.0.drools16
6 ACTIVE org.jbpm.flow.core_5.3.0.Final
13 ACTIVE org.jbpm.bpmn2_5.3.0.Final
71 ACTIVE org.jbpm.flow.builder_5.3.0.Final
142 ACTIVE org.jbpm.flow-persistence-jpa_5.3.0.FINAL
regards,
Per Sterner
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