December 2012 - rules-users - Jboss List Archives

by paulB

I'm having a problem connecting my KnowledgeAgent to a package in Guvnor. I'm using Spring to instantiate the KnowledgeAgent. The agent initializes perfectly well when I point to a local change-set that in-turn points to a local rule. However, even though I have the same rule in a package in Guvnor, the KnowledgeAgent fails with the following exception when I point to the package's change-set in Guvnor: The code at KnowledgeBaseImpl.java:148 is (using 5.3.0.Final): Here is the simple rule in the Guvnor as returned by the URL for the package source URL: Here is the local change-set definition. The line that is commented is the failing resource, whereas the local file resource works fine: Guvnor is residing on a Tomcat server. I could not find anything related to this on the forum. Thank you for any hints. -Paul -- View this message in context: http://drools.46999.n3.nabble.com/Spring-KnowledgeAgent-and-Guvnor-tp3500... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 1 month

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Starting resource change scanner and notifier in drools-server.

by Graham Thomson

Hi, I would like to ask for help with setting up drools-server with Guvnor. I am using version 5.1.1 of both. I am trying to set up an instance of drools-server in Tomcat that periodically loads new updates of packages published in Guvnor (both drools-server and Guvnor run in the same instance of Tomcat). My change set definition is as follows: <?xml version="1.0" encoding="UTF-8"?> <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs='http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation='http://drools.org/drools-5.0/change-set http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/...'> <add> <resource source='http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/<one of my packages>/LATEST' type='PKG' basicAuthentication="enabled" username="<username>" password="" /> <resource source="http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/<another of my packages>/LATEST" type="PKG" basicAuthentication="enabled" username="<username>" password="" /> </add> </change-set> My knowledge-services.xml configuration is as follows (based on the unit test examples highlighted in http://article.gmane.org/gmane.comp.java.drools.user/20992/match=drools+s...): <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:drools="http://drools.org/schema/drools-spring" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://drools.org/schema/drools-spring http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-containe..."> <drools:resource-change-scanner id="s1" interval="5" /> <drools:execution-node id="node1" /> <drools:ksession id="ksession1" type="stateless" kbase="kbase1" node="node1"/> <drools:kbase id="kbase1" node="node1" /> <drools:kagent id="kagent1" kbase="kbase1"> <drools:resources> <drools:resource type="CHANGE_SET" source="classpath:changeset.xml" /> </drools:resources> </drools:kagent> </beans> On loading drools-server, the resources listed in the change set are loaded and available. The problem is that when a new package built and published in Guvnor, drools-server does not detect this and update itself. The effect is the same as if a KnowledgeAgent were used locally and ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); were not called. This leads me to the assumption that drools-server does not start these services by default. My question is then can/how do I configure drools-server to start these services such that it will update new changes from Guvnor automatically? Thanks a lot for any help you can offer, Cheers, Graham.

12 years, 1 month

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named query TasksAssignedAsPotentialOwner doesn't work with MySql db

by Frank Knoll

Hi, When I add a task (having two potential owners) by calling the method addTask followed by calling the method getTasksAssignedAsPotentialOwner of org.jbpm.task.service.TaskClient I expect to receive a list of TaskSummaries containing at least the previously added task. But I actually get an empty list! Here is my setup and possible solution: I am using the trunk version of ./jbpm-human-task/src/main/resources/META-INF/orm.xml and a MYSQL database. When calling addTask the Task table will be populated with a NULL actualOwner_id. The named query TasksAssignedAsPotentialOwner "select new org.jbpm.task.query.TaskSummary(...t.taskData.actualOwner...) from ... left join t.taskData.actualOwner ..." of orm.xml generates SQL consisting of an inner join "inner join OrganizationalEntity user7_ on task0_.actualOwner_id=user7_.id" which doesn't take the NULL actualOwner_id correctly into account. When I replace the named query TasksAssignedAsPotentialOwner with "select new org.jbpm.task.query.TaskSummary(...actualOwner...) from ...left join t.taskData.actualOwner as actualOwner ...", then the generated SQL consists of an "left outer join OrganizationalEntity user2_ on task0_.actualOwner_id=user2_.id" which takes the NULL actualOwner_id correctly into account. So I get a List of TaskSummaries containing the added task. Is this a correct fix? Cheers, Frank -- View this message in context: http://drools.46999.n3.nabble.com/named-query-TasksAssignedAsPotentialOwn... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 2 months

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I give up, where is drools:execution-node defined??

by dunnlow

I see <drools:execution-node id="node1"/> in the drools server knowledge-services.xml and throughout the documentation. But, my app can't compile because that is undefined. I looked in drools-spring.xsd and spring-beans.xsd (the two namespaces defined in that file), but no joy. Am I just blind?? Anyone know where it is defined? Thanks -J -- View this message in context: http://drools.46999.n3.nabble.com/I-give-up-where-is-drools-execution-nod... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 3 months

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Does drools generate document from drl files?

by Zhao Yi

I want to add some comments on drl files and get a document from that. I know that guvnor can do this for me but it simply copy all the drl file content into a pdf file. What I want is that we can write some comments in a specified format provided by drools and generate a document like, html. Can I do this in drools or not? -- View this message in context: http://drools.46999.n3.nabble.com/Does-drools-generate-document-from-drl-... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 3 months

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Error Inserting events into drools fusion stream

by Ayush

Hi All, I'm trying to implement drools fusion into my app. The scenario of my app is as follows: - Facts will be received continuosly. - On receving fact I'm generating a new event and adding it into a new working memory entry point stream. Also I'm adding facts into session coz I'll be updating them. - I need to apply rules on continuous stream of events. - I've not used any camel + spring or pipeline. Are these mandatory to use? For 1st fact everything works fine but when I receive 2nd fact I'm getting Now when I'm trying to get entry point on receive of 2nd alarm I'm getting org.drools.RuntimeDroolsException: Unexpected exception executing action org.drools.reteoo.PropagationQueuingNode$PropagateAction@9ff411 Caused by: java.util.concurrent.RejectedExecutionException. On debug I found that the above exception is coming when I'm calling session.getWorkingMemoryEntryPoint("MyStream"); Can anyone please help me that how should I insert facts and events into working memory? I'd invested ample amount of time searching for this but I'm empty handed. Guys please help this is very urgent for me. Thanks in anticipation -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Error-Inserting-event... Sent from the Drools - User mailing list archive at Nabble.com.

12 years, 4 months

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Where is org.drools.server package for camel server?

by dunnlow

I downloaded and deployed the Drools 5.4 drools integration server ("drools-camel-server-5.4.0.Final.war") trying to run the test. However, there is a class referenced in test.jsp "org.drools.server.CamelServerApp" which I cannot find (actually, I found the source code for CR1 for that class in grepcode http://grepcode.com/file/repo1.maven.org/maven2/org.drools/drools-camel-s...) . Also, I can not even find the package org.drools.server. Can someone tell me anything about this class/package? Where is it and is it just for the test? Thanks, -J -- View this message in context: http://drools.46999.n3.nabble.com/Where-is-org-drools-server-package-for-... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 6 months

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Date equal comparison fails - don't understand why

by Saloojee, Karim

Hi I am comparing SimpleAccount( dateAccountOpened == "5-Feb-2011") where dateAccountOpened is "Sat Feb 05 00:00:00 GMT+02:00 2011" (if you call toString()). The equal comparator fails (==) but the greater than comparator passes (>) which I don't understand. I feel I am missing something obvious here, but I have no idea what it is. rule "Test date equality" when $acc : SimpleAccount( dateAccountOpened == "5-Feb-2011") then System.out.println("Expected and found an account opened on 5-Feb-2011: " + $acc); end rule "Some dates are more equal than others" when $acc : SimpleAccount( dateAccountOpened > "5-Feb-2011") then System.out.println("Unexpected match: " + $acc.getDateAccountOpened()); end Regards, Karim To read FirstRand Bank's Disclaimer for this email click on the following address or copy into your Internet browser: https://www.fnb.co.za/disclaimer.html If you are unable to access the Disclaimer, send a blank e-mail to firstrandbankdisclaimer(a)fnb.co.za and we will send you a copy of the Disclaimer.

12 years, 7 months

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Transaction problems in high concurrency JBPM+Drools+Hibernate instalation

by Alberto R. Galdo

Hi guys, We have an application built around long running JBPM processes with a large user base and high concurrency ... early on we began to have issues with transactions in JBPM and nowadays are watching lots of different realizations of transaction managing problems that lead to dead human tasks ( state: ERROR ), errors running processes and so on ( different exceptions follows ): 13:22:48,261 WARN [org.drools.persistence.jta.JtaTransactionManager] (pool-11-thread-1) Unable to commit transaction: javax.transaction.RollbackException: ARJUNA016053: Could not commit transaction Caused by: javax.persistence.PersistenceException: error during managed flush Caused by: javax.transaction.RollbackException: ARJUNA016053: Could not commit transaction. at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1177) at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:117) at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:75) at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.commit(ServerVMClientUserTransaction.java:167) at org.drools.persistence.jta.JtaTransactionManager.commit(JtaTransactionManager.java:179) [drools-persistence-jpa-6.0.0-SNAPSHOT.jar:6.0.0-SNAPSHOT] Caused by: javax.persistence.PersistenceException: org.hibernate.HibernateException: Flush during cascade is dangerous at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1361) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final] at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final] 11:46:23,754 ERROR [stderr] (schedulerVT_Worker-8) javax.persistence.PersistenceException: org.hibernate.HibernateException: proxy handle is no longer valid 11:46:23,754 ERROR [stderr] (schedulerVT_Worker-8) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1361) 11:46:23,755 ERROR [stderr] (schedulerVT_Worker-8) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1289) 11:46:23,756 ERROR [stderr] (schedulerVT_Worker-8) at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:261) 11:46:23,756 ERROR [stderr] (schedulerVT_Worker-8) at So, we're running this installation by the manual. Are using JBoss 7 as application server, it's transaction manager, Hibernate 4.x as entity manager, our connection pool delivers READ_COMMITED connections ( so does hibernate ) ... Is there anything else we should be doing to avoid this transactional problems? Has anyone ever tested JBPM in such concurrent scenario? Any experiences? Alberto R. Galdo argaldo(a)gmail.com

12 years, 7 months

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Drools server and knowledge agent functionality

by Manuel Ortiz

Hello everybody: I am taking a look at Drools Integration documentation to understand how Drools server works and how can be used, and have a doubt concerning, let's say... 'KnowledgeAgent capabilities'. Does Drools server support on the fly rule updating as when using KnowledgeAgent to create KnowledgeBase objects? If it does, where can be configured 'KnowledgeAgent related' properties such as newInstance or resource scanner interval? Thank you in advance for your time. Kind regards, Manuel Ortiz.

12 years, 7 months

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rules-users December 2012