[rules-users] Multiple Object Referencing error
Fnu Mahalakshmi
FMahalakshmi at nyx.com
Mon Jun 7 17:21:39 EDT 2010
Hi David,
I am giving it the input exactly as I put up. It seems to be fine.
Could it be because there are new objects of room formed even though the attributes they hold are similar???
Thank you
M
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Today's Topics:
1. Re: Exception using persistence (Robert)
2. Multiple Object Referencing problem (Fnu Mahalakshmi)
3. Re: Multiple Object Referencing problem (David Sinclair)
----------------------------------------------------------------------
Message: 1
Date: Mon, 07 Jun 2010 20:49:45 +0200
From: Robert <robert.weissmann at web.de>
Subject: Re: [rules-users] Exception using persistence
To: "Rules Users List" <rules-users at lists.jboss.org>, "Mark Proctor"
<mproctor at codehaus.org>, "PAYET, Manuel" <manuel.payet at capgemini.com>
Message-ID: <op.vdx087wrgqrarf at ntnbrwe.rgb.systemagmbh.de>
Content-Type: text/plain; charset=iso-8859-15; format=flowed;
delsp=yes
For additional information:
JPAKnowledgeService.newStatefulKnowledgeSession uses
org.drools.persistence.session.SingleSessionCommandService
where "java:comp/UserTransaction" is used (I checked the drools source
code). Looks like there is no way to change this.
I just wonder that I am the only one having this problem.
As I said "comp/UserTransaction" works, but "java:comp/UserTransaction"
doesn't, but in the docs "java:comp/UserTransaction" is used !?!?!?
Cheers, Rob.
Am 07.06.2010, 16:22 Uhr, schrieb PAYET, Manuel
<manuel.payet at capgemini.com>:
> It's probably that your transaction manager, for an odd reason, doesn't
> bind with the good name;
> You can do the following workaround:
>
> Final InitialContext initContext = new InitialContext();
> initContext.bind("java:comp/UserTransaction",initContext.lookup("comp/UserTransaction"));
>
> And voila, those two jndi name should point to the same object.
>
> I stress the fact that what I've written hasn't been tested.
>
> -----Message d'origine-----
> De : rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] De la part de Robert
> Envoy? : lundi 7 juin 2010 16:16
> ? : rules-users at lists.jboss.org; Mark Proctor
> Objet : Re: [rules-users] Exception using persistence
>
> Hi,
>
> still struggling with this one (see below),
>
> but I did a slide change in the test-code
>
> try {
> val env = new java.util.Hashtable[String, String]
> env.put(Context.INITIAL_CONTEXT_FACTORY,
> "bitronix.tm.jndi.BitronixInitialContextFactory")
> val ctx = new InitialContext(env)
> val ut1 : UserTransaction = (ctx.lookup(
> "java:comp/UserTransaction")).asInstanceOf[UserTransaction]
> } catch {
> case ex: Exception => ex.printStackTrace()
> }
>
> (Sorry, code is in Scala, but should not be a problem to read it).
>
> Instead of "java:comp/UserTransaction" (as written in the docs) I wrote
> "comp/UserTransaction" and it works.
>
> But since this is some test-code and I am able to do the look-up as I
> want ("comp/UserTransaction"), as soon as I use
>
>
> JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env )
>
>
> I have no influence anymore (its drools-code ;-) and it looks like its
> using internally "java:comp/UserTransaction".
>
>
> Is there any way to change this (setting it) ?
>
> Cheers, Rob
>
>
>
> Am 01.06.2010, 23:54 Uhr, schrieb Robert <robert.weissmann at web.de>:
>
>> Well, I tried this but it does not work.
>>
>> Checking additionally the BitronixInitialContextFactory API where it
>> says:
>>
>> ---------------------------------------------
>> "Implementation of InitialContextFactory that allows lookup of
>> transaction manager and registered resources.
>>
>> The easiest way to use this provider is to create a jndi.properties
>> file in your classpath with this content:
>> java.naming.factory.initial=bitronix.tm.jndi.BitronixInitialContextFac
>> tory Alternatively, you can create a InitialContext object with an
>> environment pointing to this class:
>> Hashtable env = new Hashtable();
>> env.put(Context.INITIAL_CONTEXT_FACTORY,
>> "bitronix.tm.jndi.BitronixInitialContextFactory");
>> Context ctx = new InitialContext(env);
>>
>> The transaction manager can be looked up at the standard URL
>> java:comp/UserTransaction while resources can be looked up using their
>> unique name as set in ResourceBean.getUniqueName(). "
>> ---------------------------------------------
>>
>>
>> So, I tried the following ( Its in Scala, but shouldn't be a problem
>> to
>> read):
>>
>> try {
>> val env = new java.util.Hashtable[String, String]
>> env.put(Context.INITIAL_CONTEXT_FACTORY,
>> "bitronix.tm.jndi.BitronixInitialContextFactory");
>> val ctx = new InitialContext(env);
>> val ut1 : UserTransaction = (ctx.lookup(
>> "java:comp/UserTransaction"
>> )).asInstanceOf[UserTransaction]
>> } catch {
>> case ex: Exception => ex.printStackTrace()
>> }
>>
>>
>> But still getting the same problem as before at line "val ut1 : ...".
>>
>> What I do not get is that the Bitronix API says that the standard URL
>> is "java:comp/UserTransaction", but its somehow not found !?!?!?
>>
>> Any ideas ?
>>
>> Cheers, Rob.
>>
>>
>>
>> Am 31.05.2010, 02:54 Uhr, schrieb Mark Proctor <mproctor at codehaus.org>:
>>
>>> On 30/05/2010 20:28, Robert wrote:
>>>> Hi, I followed the instructions on setting up the persistence in the
>>>> drools flow doc, but I get the following exception:
>>>>
>>>>
>>>> Exception in thread "main" java.lang.RuntimeException: Could not
>>>> commit session
>>>> at
>>>> org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:133)
>>>> at
>>>> org.drools.persistence.jpa.impl.JPAKnowledgeServiceProviderImpl.newStatefulKnowledgeSession(JPAKnowledgeServiceProviderImpl.java:44)
>>>> at
>>>> org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:93)
>>>> at
>>>> com.rob.server.core.process.drools.tasks.DroolsProcessHandler.<init>(DroolsProcessHandler.scala:130)
>>>> at
>>>> com.rob.server.core.process.drools.tasks.StartDroolsProcessHandler$.main(DroolsProcessHandler.scala:33)
>>>> at
>>>> com.rob.server.core.process.drools.tasks.StartDroolsProcessHandler.m
>>>> ain(DroolsProcessHandler.scala) Caused by:
>>>> javax.naming.NameNotFoundException; remaining name 'UserTransaction'
>>>> at
>>>> org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:576)
>>>> at
>>>> org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:663)
>>>> at
>>>> org.eclipse.jetty.jndi.NamingContext.lookup(NamingContext.java:678)
>>>> at
>>>> org.eclipse.jetty.jndi.java.javaRootURLContext.lookup(javaRootURLContext.java:110)
>>>> at javax.naming.InitialContext.lookup(InitialContext.java:392)
>>>> at
>>>> org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:109)
>>>> ... 5 more
>>>>
>>>>
>>>> I have no idea what this means. I guess SingleSessionCommandService
>>>> is looking up for "UserTransaction", but whats the "UserTransaction" ?
>>>>
>>> You need to configure JTA and JNDI, it uses the standard JNDI lookup
>>> mechanism to find the UserTransaction it's to be associated with. See
>>> javadocs example here:
>>> http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifac
>>> t/trunk/target/javadocs/stable/drools-api/org/drools/persistence/jpa/
>>> JPAKnowledgeService.html
>>>
>>> Each transaction framework has a different way to be configured, some
>>> are simpler than others.
>>>
>>> Mark
>>>> Cheers, Rob.
>>>>
>>>>
>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
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------------------------------
Message: 2
Date: Mon, 7 Jun 2010 17:04:19 -0400
From: Fnu Mahalakshmi <FMahalakshmi at nyx.com>
Subject: [rules-users] Multiple Object Referencing problem
To: "'rules-users at lists.jboss.org'" <rules-users at lists.jboss.org>
Message-ID:
<994758E35590274E955FA75763C5AA5002D01084 at MTEXMBXP01.ad.NYX.com>
Content-Type: text/plain; charset="us-ascii"
Hi,
I am trying out this example from the book :
public class Room {
private String name
// getter and setter methods here
}
public classs Sprinkler {
private Room room;
private boolean on;
// getter and setter methods here
}
public class Fire {
private Room room;
// getter and setter methods here
}
I load 2 input files: 1. with data of fire and Room { f1, r1;f2, r2}
2. with data of sprinkler and Room { " ", r1; " " , r2}
I am writing rule " if fire exists in room start sprinkler" { so if f1 and r1 in this case: I should get s1, r1 }
when
Fire($room : room)
$sprinkler : Sprinkler( room == $room, modified == false )
Then
$sprinkler.setmodified(true);
modify( $sprinkler ) { setSprinkle( "s1" ) };
end
But this gives me error:
Exception in thread "main" java.lang.NullPointerException
at java.io.Writer.write(Unknown Source)
at com.org.RulesTest.main(RulesTest.java:58)
>From what I observed this rule is not getting fired at all.
I want this rule to be fired on the data in my second input file.
The rules for my first input file get executed properly.
Can any1 tell me where I am going wrong??
Is there any way in which we can use the modified data { after rules are fired on the first input data and it is modified}to fire another set of rules on the same input depending on the next input file???
Thank you.
-M
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Message: 3
Date: Mon, 7 Jun 2010 17:12:16 -0400
From: David Sinclair <dsinclair at chariotsolutions.com>
Subject: Re: [rules-users] Multiple Object Referencing problem
To: Rules Users List <rules-users at lists.jboss.org>
Message-ID:
<AANLkTikJxjKh0BjNMqFU8RB5Mx10uv5eQ47Rd79d-prS at mail.gmail.com>
Content-Type: text/plain; charset="windows-1252"
This has nothing to do with Drools. It looks like you are giving Writer bad
input perhaps??
Exception in thread "main" *java.lang.NullPointerException*
at java.io.Writer.write(Unknown Source)
at com.org.RulesTest.main(*RulesTest.java:58*)
2010/6/7 Fnu Mahalakshmi <FMahalakshmi at nyx.com>
> Hi,
>
>
>
> I am trying out this example from the book :
>
> public class Room {
>
> private String name
>
> // getter and setter methods here
>
> }
>
> public classs Sprinkler {
>
> private Room room;
>
> private boolean on;
>
> // getter and setter methods here
>
> }
>
> public class Fire {
>
> private Room room;
>
> // getter and setter methods here
>
> }
>
>
>
> I load 2 input files: 1. with data of fire and Room { f1, r1;f2, r2}
>
> 2. with data of sprinkler and Room { ? ?, r1; ?
> ? , r2}
>
>
>
> I am writing rule ? if fire exists in room start sprinkler? { so if f1 and
> r1 in this case: I should get s1, r1 }
>
> when
>
> Fire($room : room)
>
> $sprinkler : Sprinkler( room == $room, modified == false )
>
> Then
>
> $sprinkler.setmodified(true);
>
> modify( $sprinkler ) { setSprinkle( ?s1? ) };
>
> end
>
>
>
> But this gives me error:
>
> Exception in thread "main" *java.lang.NullPointerException*
>
> at java.io.Writer.write(Unknown Source)
>
> at com.org.RulesTest.main(*RulesTest.java:58*)
>
>
>
> From what I observed this rule is not getting fired at all.
>
> I want this rule to be fired on the data in my second input file.
>
> The rules for my first input file get executed properly.
>
>
>
> Can any1 tell me where I am going wrong??
>
> Is there any way in which we can use the modified data { after rules are
> fired on the first input data and it is modified}to fire another set of
> rules on the same input depending on the next input file???
>
>
>
> Thank you.
>
>
>
> -M
>
> ------------------------------
>
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