July 2010 - rules-users - Jboss List Archives

by Mark Proctor

For anyone looking for a good and complex example on how to write rules properly, please look at Conways Game of Life in drools-examples, for extra bonus points compare it to the old version in M1. You'll see nearly all the logic is moved from java to the drl and we have removed the need for nested objects by using objects relaitionally, which also allows us to exploit cross products to drive the application. Mark

2 weeks

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how to debug rules in JBoss AS?

by Marina

Hello, I know one can debug rules (put breakpoints in .drl and ruleflow files) when running/debugging an application as a Drools Application. However, I would like to debug rules when my application is running in JBoss AS - just like we do a normal debugging of a Remote application running in a different JVM ,by enabling the JDWP on the server (-Xrunjdwp:transport=dt_socket,address=8787,server=y,suspend=n) and then connecting to the specified port. Basically, I would like to be able to debug both my Java classes and rules together. Is it possible? thanks, Marina

12 years, 2 months

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FW: Implementation of expert system

by Binyala, Krishna Gopal IN BLR SISL

Hello, I am new to drools community... I want to develop an expert system for medical application using drools. can you please let me know how to use history data in drools... Because as far as i know we have to keep all the data in the working memory to access. How should i implement such system? Would be better if you can provide some reference to existing expert system implemented using drools. Thanks in advance. Krishna Gopal In three words I can sum up everything I've learned about life: it goes on... Important notice:This e-mail and any attachment thereto contains corporate proprietary information. If you have received it by mistake, please notify us immediately by reply e-mail and delete this e-mail and its attachments from your system. Thank You.

12 years, 8 months

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enquiry on drools webservice

by Prem Kumar L

12 years, 11 months

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java.lang.OutOfMemoryError: Java heap space

by vdelbart

Hello, In my tests of the 4.0.3, I have some : java.lang.OutOfMemoryError. So, I try a simple test with 10.000 sequential execution of 1 rule with no context and just a workingmemorylogger and I have the error : java.lang.OutOfMemoryError: Java heap space My code is : public class ExecReglesMemotyTest { private static final Reader DRL = new InputStreamReader(ExecReglesMemotyTest.class .getResourceAsStream("/rules/exemple.drl")); private static final String FICHIER_LOG = "session"; /** * @param args */ public static void main(String[] args) { try { PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl(DRL); RuleBase ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage(builder.getPackage()); for (int i = 0; i < 10000; i++) { StatefulSession session = ruleBase.newStatefulSession(); WorkingMemoryFileLogger logger = new WorkingMemoryFileLogger(session); logger.setFileName(FICHIER_LOG); session.fireAllRules(); logger.writeToDisk(); session.dispose(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } with this rule (doesn't matter): #created on: Fri Nov 09 15:48:45 CET 2007 package initPackage #list any import classes here. rule "ERG9" when then end I try this in 4.0.1, and it's working (no OutOfMemoryError) What's the problem ? thanks for any information, V. -- View this message in context: http://www.nabble.com/java.lang.OutOfMemoryError%3A-Java-heap-space-tf477... Sent from the drools - user mailing list archive at Nabble.com.

13 years

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Problem with gateway(diverge) executing first

by Jian Feng Ng

13 years, 1 month

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Challenge! Using javassist and drools presents an issue with drl

by markricard

In order to make writing drl files easy and not requiring writers to be developers, I have written some JavaAssist code that dynamically creates a subclass and new methods in memory. If for example there is a REAL java class called 'com.foo.Instance'. Via javasssist, I create a new in-memory subclass called 'com.foo.InstanceEx'. The new class dynamically creates a new getter called getFoo(). The drl writer would like to directly reference 'foo' in the drl file like so: when i : Instance(foo == 'fee') The problem is, in order to reference foo, I would need the drl file to do this: import com.rrd.xspace.drools.InstanceEx; But I cannot do that because InstanceEx does not exist at runtime. The error I get, which is an obvious one, is "Unable to create Field Extractor for 'foo' of '[ClassObjectType class=com.foo.Instance]' in rule 'Test' : [Rule name='Test']" Is there a way to include a dynamic import of a JavaAssist class while I am constructing the KnowledgeBase instances to run the rules so that I can reference that new method? I would hope to have something similar to: KnowledgeBuilder kbuilder = .... kbuilder.addImport("com.foo.InstanceEx") or kbuilder.addClass(Class.forName("com.foo.InstanceEx")) Any help GREATLY appreciated. -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Challenge-Using-javas... Sent from the Drools - User mailing list archive at Nabble.com.

13 years, 5 months

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Re: [rules-users] Error running Drools 5.0 HelloWorldExample on WebSphere 6.1

by Blythe, Marshall

A quick follow-up: this error occurs only when I have rules using the MVEL dialect. I rewrote the MVEL rule in the HelloWorld.drl to use the Java dialect, and now the problem is gone. I may need to raise this issue on the MVEL mailing list instead. ----------------------------------------- This e-mail and any attachments may contain CONFIDENTIAL information, including PROTECTED HEALTH INFORMATION. If you are not the intended recipient, any use or disclosure of this information is STRICTLY PROHIBITED; you are requested to delete this e-mail and any attachments, notify the sender immediately, and notify the LabCorp Privacy Officer at privacyofficer(a)labcorp.com or call (877) 23-HIPAA.

13 years, 8 months

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OSGi version of Drools

by Flavius Vespasianus

Hello, is there anywhere a OSGi bundle with Drools 4.0.7? I know about com.springsource.org.drools.* but these had a lot of additional dependencies and I wasn't able to get them work. My problem is that I need to have three projects: one is the basic library which uses Drools very intensively. The second project is editor - an Eclipse plugin (that's why I need the OSGi bundle) using some classes from the basic library. It doesn't use Drools, but there is a dependency. The third project is classic Java application, also using the basic library. The basic library was originally created using standard Drools project wizard (I have downloaded the Eclipse Drools plugin - org.drools.eclipse). But when I tried to deploy it as an Eclipse plugin, it couldn't find the Drools classes. I found a little workaround - I have compiled the binaries (drools-core, drools-compiler and from libs the mvel, antlr3 and eclipse-jdt-core) into separate plugin using "Create a plugin from existing jars" wizard. But if I add this dependency to the basic library, I get a NullPointerException error on every dslr file and I cannot run the application properly). At least the second project (editor) can be compiled. What am I doing wrong? Or can I find somewhere the binaries compiled correctly into OSGi bundle? Thanks a lot! Flavius

13 years, 9 months

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Drools Expert 5 OSGi

by jflamy

I want to manage Drools Expert rules with Drools Guvnor. My understanding is that requires the use of Drools Expert version 5. I also need to use an OSGi-packaged version of Drools Expert. I saw a forum posting in 2010 alluding to such a beast, but the springsource forums only provide 4.0.7. Is there a ready-made OSGi bundle for drools expert 5, or alternately specific instructions for building one ? Jean-François Lamy -- View this message in context: http://n3.nabble.com/Drools-Expert-5-OSGi-tp681546p681546.html Sent from the Drools - User mailing list archive at Nabble.com.

13 years, 9 months

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rules-users July 2010