Problem persisting human tasks
by raic
Hi,
I'm having problems using drools flow persistance with human tasks. I'm
using drools server.
On one hand, I have my test application, which starts a MinaTaskServer for
registering human tasks, and then, the application generates JSON commands
for executing a flow with human tasks on the execution server.
Without using flow persistence, this is working ok, i'm able to retrieve the
pending tasks and completing them without problems.
When I try to configure flow persistence on the execution server, i can
start the process, the tasks are registered ok and drools flow tables are
generated in my database (processinstanceinfo,sessioninfo,workiteminfo...)
with the correct flow information. The problem appears when i retrieve a
pending task, and then, i want to complete it. It seems that the
communication between MinaTaskServer and ExecutionServer is not ok.
The error i'm getting is the following:
[2010:11:327 18:11:661:debug] Message receieved on client :
EventTriggerResponse
[2010:11:327 18:11:661:debug] Arguments :
[org.drools.task.event.EventPayload@1b2df13]
Task completed 1
[2010:11:327 18:11:661:debug] Message receieved on client :
EventTriggerResponse
[2010:11:327 18:11:661:debug] Arguments :
[org.drools.task.event.EventPayload@1f7c6e1]
Task completed 1
[2010:11:327 18:11:770:debug] Message receieved on client : GetTaskResponse
[2010:11:327 18:11:770:debug] Arguments : [org.drools.task.Task@d17fbb51]
[2010:11:327 18:11:770:exception] Uncaught exception on client
java.lang.IllegalStateException: EntityManager is closed
at org.hibernate.ejb.EntityManagerImpl.getSession(EntityManagerImpl.java
:66)
at
org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:182)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:358)
at $Proxy132.find(Unknown Source)
at
org.drools.persistence.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:88)
at
org.drools.process.workitem.wsht.WSHumanTaskHandler$GetCompletedTaskResponseHandler.execute(WSHumanTaskHandler.java:250)
at
org.drools.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:80)
at
org.drools.task.service.mina.MinaTaskClientHandler.messageReceived(MinaTaskClientHandler.java:47)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:713)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793)
at
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:375)
at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:229)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:793)
at
org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:638)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:598)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:587)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:61)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:969)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
Source
)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
Source)
at java.lang.Thread.run(Unknown Source)
And here is my configuration:
knowledge-services.xml (spring configuration)
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:drools="http://drools.org/schema/drools-spring"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://drools.org/schema/drools-spring
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-containe...">
<bean id="ds"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/drools_flow" />
<property name="username" value="user" />
<property name="password" value="pass" />
</bean>
<drools:connection id="connection1" type="local" />
<drools:execution-node id="node1" connection="connection1" />
<drools:kbase id="kbProcessWorkItems" node="node1">
<drools:resources>
<drools:resource type="CHANGE_SET"
source="classpath:changeset.xml"/>
</drools:resources>
</drools:kbase>
<bean id="myEmf"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="ds" />
<property name="persistenceUnitName"
value="org.drools.persistence.jpa.local" />
</bean>
<bean id="txManager"
class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="myEmf" />
</bean>
<drools:kstore id="kstore1" />
<drools:ksession id="ksession1" type="stateful" kbase="kbProcessWorkItems"
node="node1">
<drools:configuration>
<drools:jpa-persistence>
<drools:transaction-manager ref="txManager" />
<drools:entity-manager-factory ref="myEmf" />
<drools:variable-persisters>
<drools:persister for-class="javax.persistence.Entity"
implementation="org.drools.persistence.processinstance.persisters.JPAVariablePersister"/>
</drools:variable-persisters>
</drools:jpa-persistence>
</drools:configuration>
</drools:ksession>
</beans>
And here my persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd
http://java.sun.com/xml/ns/persistence/orm
http://java.sun.com/xml/ns/persistence/orm_1_0.xsd">
<persistence-unit name="org.drools.persistence.jpa.local"
transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>org.drools.persistence.session.SessionInfo</class>
<class>org.drools.persistence.processinstance.ProcessInstanceInfo</class>
<class>org.drools.persistence.processinstance.WorkItemInfo</class>
<class>org.drools.persistence.processinstance.variabletypes.VariableInstanceInfo</class>
<class>org.drools.persistence.processinstance.variabletypes.JPAPersistedVariable</class>
<!-- my persistent variables -->
<class>com.sample.bussiness.model.ClientModel</class>
<properties>
<property name="hibernate.dialect"
value="org.hibernate.dialect.MySQL5Dialect"/>
<property name="hibernate.max_fetch_depth" value="3" />
<property name="hibernate.hbm2ddl.auto" value="create" />
<property name="hibernate.show_sql" value="false" />
</properties>
</persistence-unit>
</persistence>
I've seen some examples that uses bitronix but i'm not using it, i don't
know if that is the problem...
Some ideas?
Thanks
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15 years, 3 months
How to specify relative URL in chagenset.xml file
by Pardeep Ruhil
Hi,
I am getting File Not Found Exception when I try to give relative path of the file.
<resource source='file:../HelloWorld.drl' type='DRL' />
But when I give the complete path, It picks the changeset.xml file.
<resource source='file:C:/Tomcat/webapps/DroolsCheck/HelloWorld.drl' type='DRL' />
Please tell me the syntax for using the relative path for my workflow or rule files.
Thanks & Regards
Pradeep Ruhil
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15 years, 3 months
taskService restart problem (urgent response needed)
by KiranP
i m having 2-3 tasks in my flow the flow works fine in the normal conditions
the tasks are handled by the MinaTaskServer and MinaTaskClient but the
problem is that it uses the command and the call back mechanism using the
map of tasks request (if i m not wrong) hence when the taskservice restarts
all the callback refrence is lost and completing any task wont updated to
the MinaTaskServer (even if the task is available)
can any one hint me who i can achieve trans-restart task completion.....
till today none of my posts got a reply..............i think u r all
busy............if some one gets time plz help....
bcoz now it has become a grave matter.........it urgent...
thanks
-----
Keep Working >>:working:
KiranP
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15 years, 3 months
Declaring events separately from rules breaks expires
by Samuli Saarinen
Hello,
I have the following situation with Drools 5.1.1: 2 drl files where one
contains an event declaration:
declare Event1
@role(event)
@expires(1s)
end
and other has a simple rule:
rule "Evt1"
when
e: Event1(value == 10)
then
System.out.println(e);
end
And I have the following test which fails:
ses.insert(new Event1(1));
ses.fireAllRules();
clock.advanceTime(2, TimeUnit.SECONDS);
ses.fireAllRules();
assertEquals(ses.getFactCount(), 0L);
The same test passes if the rule and event declaration are on the same
drl file.
Further more if I declare the event in both of the files with different
@expires the one being used is the one that is added first. I was hoping
that the first declaration to be a "default expires" that could be
overwritten later on with a new declaration but it seems that this is
currently not possible.
Cheers,
Samuli
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Samuli Saarinen tehostamiseen
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fax +358 (0)3 2125064 www.remion.com
15 years, 4 months
Instructions for upgrading designer.war?
by Han Ming Low
Hi,
I understand that the designer.war is a project by intalio.
When looking at the source for the war at
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/contrib/designer/desi...,
I saw the changes to be made to make it compatible with Drools.
I think I can do some of the steps like
1) changing the web.xml to use tomcat instead of jetty
2) added slf4j library
3) move lib/bpmn2 library to web-inf/lib
4) changes to oryx.js that involve
- commenting out the header
- commenting out the log
- change the repository url from "/designer/uuidRepository?uuid="+ uuid to
"/drools-guvnor/org.drools.guvnor.Guvnor/guvnorAPI?action=load&uuid="+ uuid
However, I'm not sure what is the BPMN2 import/export classes to replace in
WEB-INF/classes
Can someone could tell me which are the classes?
I can also help to update the designer. :)
Thanks.
Han Ming
15 years, 4 months
How do I prevent the package registry from being null in my package builder?
by retoy
I just installed Drools and wanted to build a simple RuleFlow.
But When I add any process containing constraints or rules to my
Knowledgebuilder, I'm always getting a NullPointerException, because the
"package registry" seems to be null.
.....
java.lang.NullPointerException
at org.drools.compiler.ProcessBuilder.buildProcess(ProcessBuilder.java:119)
at
org.drools.compiler.ProcessBuilder.addProcessFromFile(ProcessBuilder.java:223)
at
org.drools.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:447)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:503)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
.....
ProcessBuilder.java:118 PackageRegistry pkgRegistry =
this.packageBuilder.getPackageRegistry(process.getPackageName());
ProcessBuilder.java:119 org.drools.rule.Package p =
pkgRegistry.getPackage();
.....
The ruleflow is successfully validated though when i press that button in
eclipse... Can somebody give me a hint what's missing?
Thanks!
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15 years, 4 months
Trying to get Eclipse Java code to call Guvnor
by John Peterson
I'm using the example code from the Red Hat Magazine -
http://magazine.redhat.com/2008/08/12/jboss-drools-how-to-tuning-guvnor-
part-1/ - to try to get the sample code to work, but I keep getting the
following error:
Exception in thread "main" java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Unknown Source)
at java.util.Properties.load0(Unknown Source)
at java.util.Properties.load(Unknown Source)
at
org.drools.agent.RuleAgent.loadFromProperties(RuleAgent.java:299)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:256)
at test.GuvnorTest.main(GuvnorTest.java:15)
It appears to be unable to find my 'Guvnor.properties' file, but I have
it in the classpath (I actually have it in several different places on
my C: drive as I tried to figure out why it couldn't find it). Does
anyone have any thoughts on what's wrong here?
I'd appreciate any guidance. It seems like this should be a simple
answer but I haven't been able to figure it out.
15 years, 5 months
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
15 years, 5 months
