[rules-users] Problem in Defining Rules
I am trying to use Drools with Spring-Hibernate. I don't know whether it's a proper way of using Drools with Spring and Hibernate. I am having the MVC application in Spring. This MVC application is having the form for adding the employee id and employee name. I have a bean for Employee. And EmployeeContoller using SimpleFormController in Spring. And I am having the DAO Interface with two methods addEmp(Employee e) and displayEmp(empid) and the implementation for this interface in Hibernate. What I am trying to do is, I am checking a conditon in .drl file, if it satisfies the condition in the then part I need to save the employee bean into database. My DRL: package com.example; import com.example.EmployeeBean; rule My First Rule when a:EmployeeBean(empName == Andrew) then System.out.println(Hi Andrew -- My First Rule is Fired Successfully!!); a.getempDAOTarget().addEmp(a); end But I am getting the following error: It's Endowment Policy -- My First Rule is Fired Successfully!! java.lang.NullPointerException at com.example.Rule_My_First_Rule_0.consequence(Rule_My_First_Rule_0.java:9) at com.example.Rule_My_First_Rule_0ConsequenceInvoker.evaluate(Rule_My_First_Rule_0ConsequenceInvoker.java:22) at org.drools.common.DefaultAgenda.fireActivation(Unknown Source) at org.drools.common.DefaultAgenda.fireNextItem(Unknown Source) at org.drools.common.AbstractWorkingMemory.fireAllRules(Unknown Source) at org.drools.common.AbstractWorkingMemory.fireAllRules(Unknown Source) at com.example.PolicyController.onSubmit(PolicyController.java:41) at org.springframework.web.servlet.mvc.SimpleFormController.onSubmit(SimpleFormController.java:356) at org.springframework.web.servlet.mvc.SimpleFormController.processFormSubmission(SimpleFormController.java:258) at org.springframework.web.servlet.mvc.AbstractFormController.handleRequestInternal(AbstractFormController.java:249) at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153) at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:44) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:723) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:663) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:394) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:358) at javax.servlet.http.HttpServlet.service(HttpServlet.java:709) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595) ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] How to stop rules
Hello, i want to stop the rule engine when some spezial rules fire. I am working for rules for an online shop. The Problem (example) A rule finds out that we cannot put a book into the onlineshop besause the price is to low, not defined, ! These rule has a high salience. When this happends we can stop going on and create an error. In javacode i can write my one exception and and throw it. But what can i do in Jboss Rule? Regards Thanks Stefan ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Problems with Decision Table
Hello, I am using JBoss Rules 3.1.0M1. I am using the decision table. I don't know how we can check something like DateField = currentDate? I have tried to put Today() in data column and in condition I have put DueDt = $1. But this gives error that 'Unexpected Token' .Is there any way to put current date like new Date() in Dicision table. Also I noticed that the 'Or' condition doesn't work properly. For example if i have to enter the condition like Policy is Live or Policy is Cancelled do this 'Msg'. I have to repeat the Action (Msg) field for both the rows with live and cancelled. Is there any other way to implement 'Or'? Another thing is can we use the condition without passing the data field? For example if I put DueDt = new java.util.Date() in condition table and no fields in data column, will it work? Please let me know. Regards, Heli. -- View this message in context: http://www.nabble.com/Problems-with-Decision-Table-tf3267439.html#a9083103 Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] Rules Repository and Rule Modeller
Sorry to press; but is a release schedule available? From: Anstis, Michael (M.) Sent: 15 February 2007 09:03 To: 'Rules Users List' Subject: RE: [rules-users] Rules Repository and Rule Modeller Thanks Michael, Just so that I can acquaintance myself with your release numbering system; 3.0.5 is the current production release and 3.1.0-M1 I assume to be 3.1 Milestone 1 (pre-release). Presumably M2 and M3 are other milestones on the way to production release of 3.1 (you're going to call it 3.2 I think?)?!?! Is there a release schedule available - so we can pile the pressure on when (if) they're late? ;-) Cheers, Mike From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Neale Sent: 14 February 2007 23:59 To: Rules Users List Subject: Re: [rules-users] Rules Repository and Rule Modeller yeah, very much so. Hopefully have a demo of it in M2 or M3. I have been meaning to update the blog with the latest on package management, but haven't found time, I will do ASAP. On 2/15/07, Anstis, Michael (M.) [EMAIL PROTECTED] wrote: Hi, Just a note to enquire as to the status of the captioned? Have they progressed towards release since http://markproctor.blogspot.com/2007/01/relocation-relocation-repository .html http://markproctor.blogspot.com/2007/01/relocation-relocation-repositor y.html ? With kind regards, Michael Anstis --- COSMO(S) * Trafford House (Int) 8 718 2239 * Trafford House (Ext) +44 (0)1268 702239 * [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] Ford Motor Company Ltd. Registered in England: No. 235446 Registered Office: Eagle Way BRENTWOOD Essex CM13 3BW ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] Another upgrade to 3.0.5 question
All, OK, in my current 2.1 version of my app, I have 8 different rules files that have different sets of rules. In looking at 3.0.5 [and maybe this existed previously, but I missed it], there is a method on PackageBuilder called addPackageFromDrl. Can I load all the individual sets into 1 rule package? Then Drools will determine which rules to fire based upon what objects are asserted into working memory? The reason I came to this is I was looking at the Spring integration and was wondering if I should have 1 RuleBased of the 8 individual ones like I have today. Thoughts and Suggestion Welcome! Ron ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
RE: [rules-users] Problems with Decision Table
Hi Heli. I was doing something similar in a DT and it took ages to figure it out. I was trying to compare dates from two different bound objects. I wanted to know if one date was later than the other. To compund the problem, the value in the condition cell (the user editable part) needed to be true or false. I ended up putting the whole thing in an eval() statement like this: eval(obj1.getDate().before(obj2.getDate()) == $1) Using similar logic, yours might look like this: eval(obj1.getDateField().before(new Date()) == $1) The construct new Date() should be the current date/time. The eval() statement will return either true or false, so put that in your condition cell. Hope this helps. --Jeff -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of helidesai Sent: Wednesday, February 21, 2007 7:41 AM To: rules-users@lists.jboss.org Subject: [rules-users] Problems with Decision Table Hello, I am using JBoss Rules 3.1.0M1. I am using the decision table. I don't know how we can check something like DateField = currentDate? I have tried to put Today() in data column and in condition I have put DueDt = $1. But this gives error that 'Unexpected Token' .Is there any way to put current date like new Date() in Dicision table. Also I noticed that the 'Or' condition doesn't work properly. For example if i have to enter the condition like Policy is Live or Policy is Cancelled do this 'Msg'. I have to repeat the Action (Msg) field for both the rows with live and cancelled. Is there any other way to implement 'Or'? Another thing is can we use the condition without passing the data field? For example if I put DueDt = new java.util.Date() in condition table and no fields in data column, will it work? Please let me know. Regards, Heli. -- View this message in context: http://www.nabble.com/Problems-with-Decision-Table-tf3267439.html#a90831 03 Sent from the drools - user mailing list archive at Nabble.com. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
[rules-users] accumulate / collect behaviour question - another stupid question
Hi, Edson quoted the following sample rule some time ago: rule transaction consistency when Transaction( $id : id ) $credits: Double( ) from accumulate( TransactionEntry( id == $id, operation == credit, $amount : amount ), init( double balance = 0 ), action( balance += $amount ), result( new Double( balance ) ) ); $debits: Double( ) from accumulate( TransactionEntry( id == $id, operation == debit, $amount : amount ), init( double balance = 0 ), action( balance -= $amount ), result( new Double( balance ) ) ); eval( ! $credits.equals( $debits ) ) then // inconsistency for transaction $id End If there are 100 transactions overall and only 10 unique transaction ids (eg, id = 1..10), so that we have on average 10 Transaction facts per id, - how many times will 'eval' be called? - how many times will the action be called, assuming 'eval' always returns 'true'? I guess the answer for the above should be '10 times', once per each id? What if I put another eval statement like eval($id == 1) after existing 'eval'? Would that be evaluated 100 times (for all Transaction facts) or only 10 times (once per unique id)? I think I'm missing quite significant piece on how tuples are selected in DROOLS and how 'eval' and new 'from accumulate' features work Any pointers would be greatly appreciated! (would some general literature on rule engines help to clear up this types of questions?...) Thanks, Vlad PS: sorry for posting so many questions and answering so few. ___ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
