July 2009 - rules-users - Jboss List Archives

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.

11 years, 9 months

8
11
0 / 0

enquiry on drools webservice

by Prem Kumar L

11 years, 12 months

3
2
0 / 0

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.

12 years

4
6
0 / 0

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

12 years, 10 months

3
3
0 / 0

MVEL expression

by Femke De Backere

Hi, The following expression keeps returning the error [112,32]: [ERR 103] Line 112:32 no viable alternative at input '+' in rule "RuleFlow-Split- masterproef.ruleflows.shortsedation-18-22" in pattern Patient: Patient(sedation.ultiva+0.02 > 0.1) with sedation.ultiva returning a double What am I doing wrong? Thx, Femke

12 years, 10 months

6
9
0 / 0

Log4j in the rules?

by granz＠MIT.EDU

Hi, Is it possible to use Log4j inside the rules (RHS)?? (drl file) Thanks, Fabrice

13 years, 1 month

4
4
0 / 0

How to Access and Execute Rules from Database

by Ashish Soni

Hi All , I am able to configure oracle database in drools but now i am not able to find how can i load rules from the DB and execute them , I gone through the documentation but not able to get much information or might be i am missing something. If any one can provide me a example or some pointer ,hints then it would be helpful. Regards, Ashish

13 years, 3 months

8
12
0 / 0

how to import rules from a drl to another drl file

by raj_drools

hi , i'm using drools 4.7 . i have requirement in Drools . i have some common rules which can be used in many places . so i want to keep them in seperate drl file and impot those rules in another drl file in same package or in other . how can i share rules or functions to other rules which are in other drl files . thanks for the help in advance . regards , sekhar -- View this message in context: http://www.nabble.com/how-to-import-rules-from-a-drl-to-another-drl-file-... Sent from the drools - user mailing list archive at Nabble.com.

13 years, 9 months

4
3
0 / 0

About for and inheritance

by Chris Woodrow

Hi, I recently find out a few issues using for, and I wanted to share it with you. I made a simple exemple to illustrate my purpose. My classes are (I did not represent accessors & constructors): public class Cheese { protected String name; } public class FrenchCheese extends Cheese{ private String smell; } public class Person { private Cheese likes; } Here is my rule set : package rules rule "likes cheese" when $person : Person () Cheese( ) from $person.getLikes() then System.out.println("likes cheese"); end rule "likes french cheese" when $person : Person () FrenchCheese( ) from $person.getLikes() then System.out.println("likes french cheese"); end First test : Cheese cheese = new FrenchCheese("good", "camembert"); Person person = new Person(); person.setLikes(cheese); Output : likes french cheese likes cheese Wich is expected... Second test : Cheese cheese = new Cheese(); Person person = new Person(); person.setLikes(cheese); Output : likes french cheese likes cheese That's the first strange thing. As far as I am concerned, rule "likes french cheese" should not match (since a Cheese is not a FrenchCheese). I made a change to the second rule : rule "likes french cheese" when $person : Person () FrenchCheese( smell == "good" ) from $person.getLikes() then System.out.println("likes french cheese"); end Third test : Cheese cheese = new Cheese(); Person person = new Person(); person.setLikes(cheese); output : It throwed an exception : Exception in thread "main" java.lang.ClassCastException: rules.Cheese I am not saying the ClassCastException is not to expect in such a case but I think I would simply expect it not to match (as far as a Cheese is not a FrenchCheese). Chris

13 years, 9 months

4
10
0 / 0

Drools 4.0, Support for multiple pattern in accumulate source pattern

by Juergen

It appears as if accumulate does support only a single pattern CE as source pattern, e.g.: Number() from accumulate( Cheese( price : price ), sum( price ) ) Is it possible to have more than one pattern in the source pattern, e.g.: Number() from accumulate( Cheese( price : price, type : type ) Person( favouriteCheese == type, age > 30 ), sum( price ) ) The same could be said for collect, but there the problem to specify which item of a matching tuple is to be collected, but this could be handled recreating collect via accumulate, e.g.: Collection() from accumulate( cheese : Cheese( type : type ) Person( favouriteCheese == type, age > 30 ), collect( cheese ) )

13 years, 10 months

5
8
0 / 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

rules-users July 2009