[rules-users] Rule Compilation Problems

[Jean-Philippe Steinmetz]

Hello everyone,

 

I'm fairly new to Drools, having only worked with a basic setup for a
little while now. I've successfully gotten a Drools 5.0.1 runtime
working with an app running under JBoss 5 but now I need Drools to run
under a standalone application. I've more or less copied all of the set
up that I used in the JBoss app but am experiencing weird compilation
problems.

 

My application code looks like the following...

 

KnowledgeAgent kagent =
KnowledgeAgentFactory.newKnowledgeAgent("MyAgenda");

kagent.applyChangeSet(ResourceFactory.newClassPathResource("my_rules.xml
"));

KnowledgeBase kbase = kagent.getKnowledgeBase();

final StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();

ksession.addEventListener(new DebugAgendaEventListener());

ksession.addEventListener(new DebugWorkingMemoryEventListener());

KnowledgeRuntimeLogger krlogger =
KnowledgeRuntimeLoggerFactory.newConsoleLogger(ksession);

 

ksession.insert(myObject);

ksession.fireAllRules();

 

krlogger.close();

ksession.dispose();

 

and my rules file looks like...

 

package mypackage

 

rule "test"

    when

        Object()

    then

        System.out.println("Hello World!");

end

 

Finally this is the output I am seeing from my application...

 

[2010:06:180 18:06:144:info] ResourceChangeNotification created

[2010:06:180 18:06:147:info] ResourceChangeScanner created with default
interval=60

[2010:06:180 18:06:147:debug] ResourceChangeNotification monitor added
monitor=org.drools.io.impl.ResourceChangeScannerImpl at 7d0b8078

[2010:06:180 18:06:149:info] KnowledgAgent created, with configuration:

monitorChangeSetEvents=true scanResources=true scanDirectories=true

[2010:06:180 18:06:149:info] KnowledegAgent has started listening for
ChangeSet notifications

(null: 3, 78): SchemaLocation: schemaLocation value =
'http://drools.org/drools-5.0/change-set.xsd' must have even number of
URI's.

(null: 3, 78): cvc-elt.1: Cannot find the declaration of element
'change-set'.

[2010:06:180 18:06:181:info] KnowledgAgent applying ChangeSet

[2010:06:180 18:06:182:debug] KnowledgeAgent subscribing to
resource=[ClassPathResource path='TestRules.drl']

[2010:06:180 18:06:182:debug] ResourceChangeNotification subscribing
listener=org.drools.agent.impl.KnowledgeAgentImpl at 61176350 to
resource=[ClassPath

Resource path='TestRules.drl']

[2010:06:180 18:06:185:debug] ResourceChangeScanner subcribing
notifier=org.drools.io.impl.ResourceChangeNotifierImpl at 46794afc to
resource=[ClassPathR

esource path='TestRules.drl']

[2010:06:180 18:06:187:debug] KnowledgeAgent ChangeSet requires
KnowledgeBuilder

[2010:06:180 18:06:187:debug] KnowledgeAgent rebuilding KnowledgeBase
using ChangeSet

[2010:06:180 18:06:315:debug] KnowledgeAgent building
resource=[ClassPathResource path='TestRules.drl']

java.lang.NoSuchMethodError:
org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/e
clipse/jdt/core/compiler/CategorizedProblem;

        at
org.drools.commons.jci.compilers.EclipseJavaCompiler$3.acceptResult(Ecli
pseJavaCompiler.java:321)

        at
org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:335)

        at
org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJava
Compiler.java:351)

        at
org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJa
vaCompiler.java:51)

        at
org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.
java:389)

        at
org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompile
timeRegistry.java:56)

        at
org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:74)

        at
org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:690)

        at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:653)

        at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java
:290)

        at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.j
ava:488)

        at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.ja
va:25)

        at
org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgent
Impl.java:386)

        at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm
pl.java:120)

        at
org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentIm
pl.java:109)

 

Now I've checked all of the maven dependencies to make sure the they are
all there and I can doubly confirm everything is fine. In fact, I even
went so far to make sure the jars included in my app contained the
org.eclipse.jdt.core.compiler.CategorizedProblem.class file. The only
difference I've been able to think of so far is that my standalone
application uses the Java service wrapper where JBoss does not.

 

Any help is greatly appreciated.

 

Cheers,

 

Jean-Philippe Steinmetz

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