discrepency between drools eclipse editor and runtime
by saprar
Hi,
I am trying to work with Activiti and drools. I am new to both.
I have a simple drl written using the eclipse drools editor.
-----------
package com.x.workflow
import com.x.api.dto.User;
rule "validate_user"
when
userX : User(getName().equals("test123"))
then
userX.setDescription("changed in workflow)";
System.out.println("user is test123");
end
--------
The editor does not flag any errors, but, when I run the workflow through my
webapp, I see the following error :
Rule Compilation error : [Rule name='validate_user']
com/x/workflow/Rule_validate_user.java (7:439) : Syntax error, insert ")"
to complete Expression
904224 [tomcat-http--51] ERROR
org.activiti.engine.impl.interceptor.CommandContext - Error while closing
command context
java.lang.IllegalArgumentException: Could not parse knowledge.
at
org.drools.builder.impl.KnowledgeBuilderImpl.newKnowledgeBase(KnowledgeBuilderImpl.java:67)
at
org.activiti.engine.impl.rules.RulesDeployer.deploy(RulesDeployer.java:61)
the java file Rule_validate_user.java is not written by me, in fact I cannot
locate it in my source.
It appears it is generated by drools engine.
And, I cannot find what is wrong with my drl file from the error printed.
Appreciate any pointers.
thanks
sapra
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14 years, 10 months
Problem with DroolsFlow transaction
by HMandic
I have a problem with transaction manager in drools flow (at least I think
so).
I'm running an EJB3 application in Jboss AS 5.1.0GA with Postgres 8.4.4 as
database. I use one schema for my data and another for drools data. The
application itself is also split in two projects, one for my utility classes
that interact with drools and the other for my application that uses those
utility classes.
I'm using the same datasource and transaction type is JTA.
I have an object that holds a reference to processID from drools flow as one
of its fields. When I invoke my method to create that object (in a stateless
session bean), a transaction is opened and it lasts until the end of said
method. But somewhere inside that method I need to invoke
ksession.startProcess(processName, params) and then I get this:
java.lang.IllegalStateException: Wrong tx on thread: expected
TransactionImple < ac, BasicAction: -3f57ffd6:dfb:4c878d37:7e status:
ActionStatus.ABORTED >, actual null
at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:157)
at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)
at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:190)
at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
at org.jboss.ejb3.tx.NullInterceptor.invoke(NullInterceptor.java:42)
at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
.
.
.
Does that mean that I need to run the drools part in a separate thread?
I'm clueless...
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14 years, 10 months
Date comparison
by Deshpande, Prasad
Hi,
As per documentation, I'm trying to use a simple rule for date comparison,
rule "EFP_14"
when
v:ResourceValue(QName == "A.datetime", value > "01-nov-2011")
then
System.out.println("--> Rule executed");
end
but I get following error while executing rule.
Not possible to compare a class java.util.Date with a class java.lang.String
It's actually default date format so should work, why is it complaining for class casting? Am I doing something wrong here?
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14 years, 10 months
Re: [rules-users] Showstopper issues for Drools Adoption in our organization
by GPatel＠tsys.com
For issue 2, combination of DSL and wrapper layer around ur engg objects might help
----- Original Message -----
From: kapokfly [ivan.jiang.ww(a)foxmail.com]
Sent: 11/11/2011 02:53 AM PST
To: rules-users(a)lists.jboss.org
Subject: [rules-users] Showstopper issues for Drools Adoption in our organization
Not sure if these are also your questions you might have with the rule engine
adoption, but we have seen 2 showstopper issues for drools adoption in our
organization, or it is just because we are lack of some necessary knowledge.
Issue 1) : pattern match for large data
There are cases in a rule we need find matched records against a large
population of data and perform some actions.
Example:
From 2 millions employee directory, find those belongs to Depart1 and
with salary increased by 10% last year.
Inserting all these employee's data into WorkingMemory is HUGE and
mission impossible, we can't simply load the entire db into the working
memory, do we have any other approach to accomplish or this is just not a
use case can be resolved by a rule engine?
Issue 2): Map business object to real engineering implementation
What we are trying to do is to build a rule UI which a business user without
engineering background of our codebase can work with; the business object we
show on the UI might be different with the real engineering objects already
in system, for example, on the UI a user might be able to able to see
something like person.address.addressLine1 but the actually implementation
might not be an object traverse implementation.
Example, the model could be Long Person.addressId ; then referring to his
address we need another lookup and we want to hide such complexity to the
end user.
The approach we took is to design a translation layer to translate the user
input to drools rule string, is this the right approach?
If not, any suggestions? I know Drools is mainly designed for developers but
just trying to see if there is any way we can work it around.
Thanks and looking forward to your recommendations.
Ivan
-----
Ivan, your Panda, forever
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14 years, 10 months
Human Task - ERROR : JPAKnowledgeService.newStatefulKnowledgeSession ...
by S.M.H.Jamali
Hello all,
I get an exception while last line of below method executed :
public StatefulKnowledgeSession createSession() throws Exception {
/*
* Create the knowledgebase using the required bpmn and drl files
*/
KnowledgeBase kbase = readKnowledgeBase("HumanTask.bpmn");
EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.jbpm.persistence.jpa" );
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf );
env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() );
env.set( EnvironmentName.GLOBALS, new MapGlobalResolver() );
Properties properties = new Properties();
properties.put("drools.processInstanceManagerFactory", "org.jbpm.persistence.processinstance.JPAProcessInstanceManagerFactory");
properties.put("drools.processSignalManagerFactory", "org.jbpm.persistence.processinstance.JPASignalManagerFactory");
KnowledgeSessionConfiguration config = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties);
return JPAKnowledgeService.newStatefulKnowledgeSession(kbase, config, env);
}
its stack-trace is :
14:26:13,111 WARN [JtaTransactionManager] Participating in existing JTA transaction, but no JTA TransactionManager or TransactionSychronizationRegistry available:
java.lang.NullPointerException
at org.drools.persistence.jta.JtaTransactionManager.registerTransactionSynchronization(JtaTransactionManager.java:221)
at org.drools.persistence.SingleSessionCommandService.registerRollbackSync(SingleSessionCommandService.java:333)
at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:123)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)...
Can anyone help me to solve this problem ?
Thanks in advance
S.M.H.Jamali
14 years, 10 months
Fw: jbpm 3.2.x verssion .....
by Sumeet Karawal
Hi,
I have to meet an urgent requirement and not getting any information
regarding which of these version is stable. Could any body please help me
on this.
Is it better to use jbpm v 3.2.2 or jbpm v 3.2.8 with Drools v5.3 and JBoss
AS v5.1.
or any other version of jbpm among v3.2.x
Thanks & Regards,
Sumeet Karawal
Mailto: sumeet.karawal(a)tcs.com
----- Forwarded by Sumeet Karawal/MUM/TCS on 11/11/2011 11:16 PM -----
From: Sumeet Karawal <sumeet.karawal(a)tcs.com>
To: Rules Users List <rules-users(a)lists.jboss.org>
Date: 11/11/2011 03:11 PM
Subject: Re: [rules-users] jbpm 3.2.x verssion .....
Sent by: rules-users-bounces(a)lists.jboss.org
Thanks Thomas
No, I am a little confused which version to use. I visited the site
http://sourceforge.net/projects/jbpm/files/jBPM%203/. Here the maximum
downloads are for v 3.2.2 and the latest among these is v3.2.8. It would
be very helpful if you could suggest me which one to use among the versions
3.2.x. As my requirement is to use jbpm v3.2.x with Drools and Jboss AS,
and later on Mule ESB v3.1 will also be used. So I am thinking of
installing jbpm among v3.2.x with Drools v5.3 Final and JBoss AS v 5.1.
Will these components work together?
Also, jbpm Enterprise Supports v3. So is there much difference between the
enterprise version of jbpm v3 and the community versions of v3.2.x
Thanks & Regards,
Sumeet Karawal
Mailto: sumeet.karawal(a)tcs.com
From: "Swindells, Thomas" <TSwindells(a)nds.com>
To: Rules Users List <rules-users(a)lists.jboss.org>
Date: 11/11/2011 02:56 PM
Subject: Re: [rules-users] jbpm 3.2.x verssion .....
Sent by: rules-users-bounces(a)lists.jboss.org
It's java. As long as you have a compatible JVM then it should run.
Have you encountered any problems using it?
Thomas
> -----Original Message-----
> From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-
> bounces(a)lists.jboss.org] On Behalf Of Sumeet Karawal
> Sent: 11 November 2011 09:12
> To: rules-users(a)lists.jboss.org
> Subject: [rules-users] jbpm 3.2.x verssion .....
>
>
> Hi,
>
> Can any body let me know whether jbpm v 3.2.8 is compatible with sun
> solaris. If not then which of the versions among v3.2.x is compatible
with it.
> As I have to install it in both Windows and Sun Solaris.
>
>
> Thanks in advance,
> Sumeet Karawal
> Mailto: sumeet.karawal(a)tcs.com
>
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14 years, 10 months
ClassLoader parameter and Init function of RuleBaseConfiguration
by ssprick
Hello everyone,
I'm struggling with the following error after updating from Drools 5.1M1 to
5.3Final when handing over a URLClassloader as a parameter for
RuleBaseConfiguration. The URL of the classLoader points to Jar file
containing the facts.
ERROR JobRunShell - Job TIQRULES_PROJECT4.TIQRULES_PROJECT4 threw an
unhandled Exception:
java.lang.NoSuchMethodError:
org.drools.RuleBaseConfiguration.<init>([Ljava/lang/ClassLoader;)V
at
de.tiq.rules.drools.DroolsEngine.createKnowledgeBase(DroolsEngine.java:263)
at
de.tiq.rules.drools.DroolsEngine.run(DroolsEngine.java:95)
at
de.tiq.rules.TIQRulesEngine.executeRuleResource(TIQRulesEngine.java:178)
at
de.tiq.quartz.QuartzTaskExecutor.execute(QuartzTaskExecutor.java:173)
at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:546)
ERROR ErrorLogger - Job (TIQRULES_PROJECT4.TIQRULES_PROJECT4 threw an
exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested
exception: java.lang.NoSuchMethodError:
org.drools.RuleBaseConfiguration.<init>([Ljava/lang/ClassLoader;)V]
at org.quartz.core.JobRunShell.run(JobRunShell.java:210)
at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:546)
Caused by: java.lang.NoSuchMethodError:
org.drools.RuleBaseConfiguration.<init>([Ljava/lang/ClassLoader;)V
at
de.tiq.rules.drools.DroolsEngine.createKnowledgeBase(DroolsEngine.java:263)
at
de.tiq.rules.drools.DroolsEngine.run(DroolsEngine.java:95)
at
de.tiq.rules.TIQRulesEngine.executeRuleResource(TIQRulesEngine.java:178)
at
de.tiq.quartz.QuartzTaskExecutor.execute(QuartzTaskExecutor.java:173)
at org.quartz.core.JobRunShell.run(JobRunShell.java:199)
This is the part of the code where the ClassLoader is given as a parameter:
/**
* create a knowledge base of a given rule resource
*
* @param ruleResource
* the rule resource
* @return the created knowledge base
*/
private KnowledgeBase createKnowledgeBase(IRuleResource
ruleResource) {
if (ruleResource == null) {
throw new
NullPointerException("ruleResource is null");
}
KnowledgeBase kbase;
ClassLoader[] arrayOfClassLoaders = new
ClassLoader[1];
arrayOfClassLoaders[0] =
currProject.getFactsClassLoader();
final KnowledgeBaseConfiguration kbaseconfig
= new RuleBaseConfiguration(currProject.getFactsClassLoader());
kbase =
KnowledgeBaseFactory.newKnowledgeBase(kbaseconfig);
kbase.addKnowledgePackages(ruleResource.getKnowledgePackages(kbase));
return kbase;
}
This is what getFactsClassLoader does:
public ClassLoader getFactsClassLoader() {
try {
if (factsClassLoader == null) {
URL jarURL;
jarURL = getExecuteJarFile().toURI().toURL();
factsClassLoader = new URLClassLoader(new URL[] { jarURL },
Thread.currentThread()
.getContextClassLoader());
}
return factsClassLoader;
} catch (final MalformedURLException e) {
throw new RuntimeException(e);
}
}
Thx in advance for any hint on solving the mentioned problem!
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14 years, 10 months
