Hello,

I have many problems to integrate Drools in my existing Application that is running on JBoss AS 4.0.5 GA.

When I try to load and execute the rule-file I get the following Exception:

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

javax.ejb.EJBException: java.lang.RuntimeException: java.lang.NoSuchMethodError: org.eclipse.jdt.internal.compiler.CompilationResult.getProblems()[Lorg/eclipse/jdt/core/compiler/CategorizedProblem;

      at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:69)

      at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)

      at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)

      at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)

      at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)

      at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)

      at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62)

      at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)

      at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)

      at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:102)

      at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)

      at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)

      at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)

      at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)

      at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)

      at org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:263)

      at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)

      at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)

      at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)

      at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:681)

      at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:358)

      at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:412)

My Application consists of the following parts:

The rule-file:

#created on: 04.09.2007

package drools.rules

#list any import classes here.

import drools.session.Message;

#declare any global variables here

rule "Hello World"

when

            m : Message( status == Message.HELLO, message : message )

then

            System.out.println( message );

            m.setMessage( "Goodbye cruel world" );

            m.setStatus( Message.GOODBYE );

update( m );

end

rule "GoodBye"

no-loop true

when

            m : Message( status == Message.GOODBYE, message : message )

then

System.out.println( message );

            m.setMessage( message );

end

a Class to encapsulate the rule-initialisation and rule-execution (wrapper-Class):

public class RuleEngineWrapper

{

private WorkingMemory workingMemory;

private boolean debugMode = false;

private DebugAgendaEventListener debugListener;

public RuleEngineWrapper(WorkingMemory wm) {

this.workingMemory = wm;

debugListener = new DebugAgendaEventListener();

        }

/**

* construct a RuleEngineWrapper with only a rule-file-name, no idea of

* callers' class. Assume the rule file is located

*

* @param rulesFile

*/

public RuleEngineWrapper(String rulesFile) {

this(RuleEngineWrapper.class, rulesFile);

        }

/**

* construct a RuleEngineWrapper with only a calling object known

*

* @param caller

* @param rulesFile

*/

public RuleEngineWrapper(Object caller, String rulesFile) {

this(caller.getClass(), rulesFile);

        }

/**

* construct a RuleEngineWrapper with Class caller and rule-file-name known.

* We load the rule-file as classpath resource.

*

* @param caller

* @param rulesFile

*/

public RuleEngineWrapper(Class caller, String rulesFile) {

super();

try {

final PackageBuilder builder = new PackageBuilder();

System.out.println(caller);

                builder.addPackageFromDrl(new InputStreamReader(caller

                        .getResourceAsStream(rulesFile)));

final RuleBase ruleBase = RuleBaseFactory.newRuleBase();

ruleBase.addPackage(builder.getPackage());

workingMemory = ruleBase.newStatefulSession();

debugListener = new DebugAgendaEventListener();

            } catch (Exception e) {

                System.out.println("cannot read rule file: " + rulesFile);

            }

        }

/**

* Allow to add arbitrary objects as facts. Users can add any objects to

* workingMemory

*

* @param o

* the fact to be added

*/

public void addFact(Object o) {

workingMemory.insert(o);

        }

/**

* Execute rules.

*

*/

public void executeRules() {

workingMemory.fireAllRules();

        }

/**

* toggle debugging mode (adds a DebugAgendaEventListener if called once.

* Removes if called again.

*/

public void setDebugMode( boolean debug ) {

if (debugMode ) {

workingMemory.removeEventListener( debugListener );

            }

else workingMemory.addEventListener(debugListener);

        }

public WorkingMemory getWorkingMemory() {

return workingMemory;

            }

public void setWorkingMemory(WorkingMemory workingMemory) {

this.workingMemory = workingMemory;

            }

}

A stateless Sessionbean for the access from the Testcase

@Remote(droolsManagement.class)

public @Stateless class droolsManagementBean implements droolsManagement

{

public void startRuleEngineWrapper(String rulesFile, ArrayList<Object> objektListe) throws Exception

      {

try

            {  

//load up the rulebase + StatefulSession (WorkingMemory)

                  RuleEngineWrapper rew = new RuleEngineWrapper("/drools/rules/" + rulesFile);

for (Object object : objektListe)

                  {

                    rew.addFact(object);

                  }

                  rew.executeRules();

            }

catch (Exception e)

            {

            System.out.println("exception in 'droolsManagementBean.startRuleEngineWrapper(String, ArrayList<Object>)', cannot handle it...");

        }

      }

}

And the test-case:

@Test

public void TestDroolsRuleEngineWrapper()

      {

try

            {

                  String rulesFile = "testRule.drl";

//go !

                  Message message = new Message();

                  message.setMessage(  "Hello World" );

                  message.setStatus( Message.HELLO );

                  ArrayList<Object> objektListe = new ArrayList<Object>();

objektListe.add(message);

droolsM.startRuleEngineWrapper(rulesFile, objektListe);

            }

catch (Exception e)

            {

                  System.out.println("Exception in TestDroolsRegeln.TestDroolsRuleEngineWrapper: " + e.getMessage());

e.printStackTrace();

            }

      }