October 2010 - rules-users - Jboss List Archives

by Charles SOUILLARD

Hi all, i'm a newbie on Drools and want to understand the general architecture of the solution. Is it true that Drools Guvnor helps managing rules definition but it is not a rule server ? Meaning we can define, update, archive, test... rules but not execute them in Guvnor? My understanding is that Drools expert is the engine, let's say the rules server) on which one rules are executed. Is there any graphical tool to manage this engine? I mean to add/remove rules, access a dashboard... Is it … [View More]

13 years, 11 months

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KnowledgeAgent and Guvnor restart

by Gerret Hansper

Hello, I have got an issue with the KnowledgeAgent that seems not to survive a Guvnor restart. The scenario is as follows: * We use Drools 5.0 * On our application server we create a KnowledgeAgent applying a ChangeSet that points to a package binary on a separate Guvnor server like so: SystemEventListenerFactory.setSystemEventListener(new SystemEventLogger()); ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); … [View More]KnowledgeAgent agent = KnowledgeAgentFactory.newKnowledgeAgent(workflowName); agent.applyChangeSet(changeSet); * Creating the kbase, registering globals and running sessions works fine. * We shut down Guvnor (or the connection goes down, this was how we spotted the problem) and restart it after a minute * We then try to run sessions from the same agent as above via kagent.getKnowledgeBase().newStatefulKnowledgeSession(); which returns a ksession, but then setting a global we get java.lang.RuntimeException: Unexpected global [log] at org.drools.common.AbstractWorkingMemory.setGlobal(AbstractWorkingMemory.java:5 50) at org.drools.impl.StatefulKnowledgeSessionImpl.setGlobal(StatefulKnowledgeSessio nImpl.java:284) >From the debugger I can see that indeed the ruleBase's globals map is empty. The SystemEventLogger indicates that the KnowledgeAgent unsubscribes from its resource when Guvnor is down and rebuilds its kbase. Also, it stops scanning the resource and does not find it once Guvnor is up again. (See log snippet below). Wouldn't it be better in these cases to keep the resource as is in memory and try to rescan? I figure that as long as the resource is specified in the changeSet it should be considered part of the kbase and not be removed if it cannot be found. For the time being, does anyone have a suggestion how to avoid these problems? We could catch the RuntimeException and recreate the KnowledgeAgent, but perhaps there is a better way? Thanks, Gerret -- SystemEventLog -- # Guvnor is up here 07:58:01,881 ResourceChangeScanner attempt to scan 1 resources 07:58:02,209 ResourceChangeScanner thread is waiting for 60 07:58:15,067 ResourceChangeScanner attempt to scan 1 resources # Guvnor goes down here 07:58:16,738 ResourceChangeScanner removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification received ChangeSet notification 07:58:16,738 ResourceChangeScanner thread is waiting for 60 07:58:16,738 ResourceChangeNotification processing ChangeSet 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@1053d6d 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@b71c17 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 ResourceChangeNotification thread is waiting for queue update 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1053d6d to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@b71c17 to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:59:02,202 ResourceChangeScanner attempt to scan 0 resources 07:59:02,202 ResourceChangeScanner thread is waiting for 60 # Guvnor back up here 07:59:16,731 ResourceChangeScanner attempt to scan 0 resources 07:59:16,731 ResourceChangeScanner thread is waiting for 60 -- Nur noch bis 31.01.2010: DSL-Komplettpaket für 16,99 Euro/mtl.!* http://portal.gmx.net/de/go/dsl02 [View Less]

13 years, 11 months

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Can Drools Flow Persistence Work without JTA

by Rui Tang

Hi list, According to the documents and some test cases, I found that Drools Flow persistence examples have to work with JTA to enable transaction management. Is there some way to not use JTA as my transaction manager? -- 唐睿

13 years, 11 months

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mvn failed to install under drools-5.1.1-examples.zip

by Aman

When I tried to run mvn install, it gave me following error- [INFO] Scanning for projects... Downloading: http://repo1.maven.org/maven2/org/drools/drools/5.1.1/drools-5.1.1.pom [INFO] Unable to find resource 'org.drools:drools:pom:5.1.1' in repository central (http://repo1.maven.org/maven2) [INFO] ------------------------------------------------------------------------ [ERROR] FATAL ERROR [INFO] ------------------------------------------------------------------------ [INFO] Error … [View More]building POM (may not be this project's POM). Project ID: null:drools-examples:pom:null Reason: Cannot find parent: org.drools:drools for project: null:drools-examples:pom:null for project null:drools-examples:pom:null [INFO] ------------------------------------------------------------------------ [INFO] Trace org.apache.maven.reactor.MavenExecutionException: Cannot find parent: org.drools:drools for project: null:drools-examples:pom:null for project null:drools-examples:pom:null at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:404) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:272) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138) at org.apache.maven.cli.MavenCli.main(MavenCli.java:362) at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39 ) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl .java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315) at org.codehaus.classworlds.Launcher.launch(Launcher.java:255) at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430) at org.codehaus.classworlds.Launcher.main(Launcher.java:375) Caused by: org.apache.maven.project.ProjectBuildingException: Cannot find parent: org.drools:drools for project: null:drools-examples:pom:null for project null:drools-examples:pom:null at org.apache.maven.project.DefaultMavenProjectBuilder.assembleLineage(DefaultM avenProjectBuilder.java:1396) at org.apache.maven.project.DefaultMavenProjectBuilder.buildInternal(DefaultMav enProjectBuilder.java:823) at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromSourceFileInter nal(DefaultMavenProjectBuilder.java:508) at org.apache.maven.project.DefaultMavenProjectBuilder.build(DefaultMavenProjec tBuilder.java:200) at org.apache.maven.DefaultMaven.getProject(DefaultMaven.java:604) at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:487) at org.apache.maven.DefaultMaven.getProjects(DefaultMaven.java:391) ... 12 more Caused by: org.apache.maven.project.ProjectBuildingException: POM 'org.drools:drools' not found in repository: Unable to download the artifact from any repository org.drools:drools:pom:5.1.1 from the specified remote repositories: central (http://repo1.maven.org/maven2) for project org.drools:drools at org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepository( DefaultMavenProjectBuilder.java:605) at org.apache.maven.project.DefaultMavenProjectBuilder.assembleLineage(DefaultM avenProjectBuilder.java:1392) ... 18 more Caused by: org.apache.maven.artifact.resolver.ArtifactNotFoundException: Unable to download the artifact from any repository org.drools:drools:pom:5.1.1 from the specified remote repositories: central (http://repo1.maven.org/maven2) at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultAr tifactResolver.java:228) at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultAr tifactResolver.java:90) at org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepository( DefaultMavenProjectBuilder.java:558) ... 19 more Caused by: org.apache.maven.wagon.ResourceDoesNotExistException: Unable to download the artifact from any repository at org.apache.maven.artifact.manager.DefaultWagonManager.getArtifact(DefaultWag onManager.java:404) at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultAr tifactResolver.java:216) ... 21 more [INFO] ------------------------------------------------------------------------ [INFO] Total time: < 1 second [INFO] Finished at: Sat Oct 02 16:37:04 EDT 2010 [INFO] Final Memory: 1M/4M [INFO] ------------------------------------------------------------------------ [View Less]

13 years, 11 months

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StatefulKnowledgeSession Vs StatefulSession

by DeepakA

I used a KnowledgeBuilder ro read the resources (DSL & DSLR files) Then created a KnowledgeBase and created a StatefulKnowledgeSession out of the KnowledgeBase. The StatefulKnowledgeSession was used to start the process and fire all rules. Then I realized I was not able to access the RuleBase from StatefulKnowledgeSession. So, now I create a RuleBase, then a PackageBuilder, add the resources to the packageBuilder, then add the package to the RuleBase and create a StatefulSession out of … [View More]

14 years

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Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage

by Greg Barton

I was going to look at this at some point. I guess that point will be tonight. :) GreG On Oct 25, 2010, at 15:02, Edson Tirelli <tirelli(a)post.com> wrote: No worries, it is a good starting point anyway. Hopefully someone can continue from there or I will eventually fix it. Just a lot of stuff in my plate already that have priority over this. Edson 2010/10/25 mardo <mardo(a)abicola.de>: Unfortunately no, I just had a look how it was implemented (like http://tutorials.… [View More]jenkov.com/java-concurrency/thread-signaling.html#missedsig nals) -> missed signals and noticed that it somehow didn't work as intended. But no idea how to directly correct it, sorry. -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: Montag, 25. Oktober 2010 21:30 To: Rules Users List Subject: Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage Do you have a solution/patch for it? Edson 2010/10/25 mardo <mardo(a)abicola.de>: Luckily just stumbled upon this mail... You can take a look at http://drools-java-rules-engine.46999.n3.nabble.com/fireUntilHalt-and-OSGi-C PU-load-td1022352.html where I already provided a minimal example (don't know if it covers all cases) and tracked it down to missedNotifyAll in DefaultAgenda cheers -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli Sent: Montag, 25. Oktober 2010 21:17 To: Rules Users List Subject: Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage This is clearly a regression as Drools should be not be using busy waits in fireUntilHalt(). It should use monitors and locks as it was doing before. Can anyone open a JIRA? also, if anyone would be willing to take investigate and fix this one, it would really help. Otherwise, I will add it to my queue. Thanks, Edson 2010/10/25 Norman C <rent_my_time(a)yahoo.com>: Note that the 100% CPU issue with fireUntiHalt is only with the 5.1 version of Drools. In 5.0.x, CPU is close to 0% when there are no rules to fire. I saw this when I was testing upgrading to 5.1. Norman ----- Original Message ---- From: jschmied <nabble(a)juergenschmied.de> To: rules-users(a)lists.jboss.org Sent: Sun, October 24, 2010 4:06:02 AM Subject: Re: [rules-users] Starting engine using fireUntilHalt and inserting no facts results in 50% CPU usage Hi! fireUntilHalt uses one processor with 100%. You have a dualcore, so it's 50%. It's by design like this. You can: - Call fireAllRules after every insert if you have no ruleflow. - Use fireAllRules in a loop with a small sleep and check for the end of the ruleflow in the loop: while (prc.getState() == ProcessInstance.STATE_ACTIVE) { Threads.sleep(20); ksession.fireAllRules(); } with both methods you get a low cpu load. bye juergen -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Starting-engine-using-fi reUntilHalt-and-inserting-no-facts-results-in-50-CPU-usage-tp1760370p1761821 .html Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users [View Less]

14 years

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[Urgent] Error in ontext assist in DSLR Editor

by hamza bakkali

Hi All, I have been using drools 4 for couple of months now and I am starting to get the hang of it. We recently decided to move to Dools 5 with Eclipse 3.4.2 (Ganymede). We unfortunately hit a major 'show stopper' (for us). In the DSLR editor: Context Assist + space + enter removes/replaces the whole line, not only the place holder. In other words: DSL: [*][]Log : {msg}=System.out.println("{msg}"); [*][]id1="some id label" DSLR: rule "MyRule" when then end If I Press L , control … [View More]

14 years

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Drools planner & Scala

by Adam Warski

Hello, I'm using Planner in a Scala program and it almost works without problems; the only one is in implementing the Solution interface, as it uses raw (erased) version of Score, which is normally generic (Score<S extends Score>). Scala generally doesn't like raw types and in most cases it's impossible to extend/implement interfaces which use them. A work-around is to introduce an "adapter" in Java, which you can later extend in Scala: public abstract class ScalaSolution implements … [View More]

14 years

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How to specify relative URL in chagenset.xml file

by Pardeep Ruhil

Hi, I am getting File Not Found Exception when I try to give relative path of the file. <resource source='file:../HelloWorld.drl' type='DRL' /> But when I give the complete path, It picks the changeset.xml file. <resource source='file:C:/Tomcat/webapps/DroolsCheck/HelloWorld.drl' type='DRL' /> Please tell me the syntax for using the relative path for my workflow or rule files. Thanks & Regards Pradeep Ruhil ________________________________ This Email may contain … [View More]

14 years

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taskService restart problem (urgent response needed)

by KiranP

i m having 2-3 tasks in my flow the flow works fine in the normal conditions the tasks are handled by the MinaTaskServer and MinaTaskClient but the problem is that it uses the command and the call back mechanism using the map of tasks request (if i m not wrong) hence when the taskservice restarts all the callback refrence is lost and completing any task wont updated to the MinaTaskServer (even if the task is available) can any one hint me who i can achieve trans-restart task completion..... … [View More]

14 years, 1 month

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rules-users October 2010