4:21 p.m.
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(a)web.de>
Subject: Re: [rules-users] Exception using persistence
To: "Rules Users List" <rules-users(a)lists.jboss.org>, "Mark
Proctor"
<mproctor(a)codehaus.org>, "PAYET, Manuel"
<manuel.payet(a)capgemini.com>
Message-ID: <op.vdx087wrgqrarf(a)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(a)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(a)lists.jboss.org
[mailto:rules-users-bounces@lists.jboss.org] De la part de Robert
Envoy? : lundi 7 juin 2010 16:16
? : rules-users(a)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(a)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(a)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(a)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(a)nyx.com>
Subject: [rules-users] Multiple Object Referencing problem
To: "'rules-users(a)lists.jboss.org'" <rules-users(a)lists.jboss.org>
Message-ID:
<994758E35590274E955FA75763C5AA5002D01084(a)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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