2:14 a.m.
cheney-dut [http://community.jboss.org/people/cheney-dut] created the discussion
"How to make a process instance go on with jBPM5?"
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Hi all ,
The Code:
KnowledgeBase kbase = readKnowledgeBase("demo.bpmn");
StatefulKnowledgeSession ksession = createKnowledgeSession(kbase, 1); //
JPAKnowledgeService.loadStatefulKnowledgeSession(sessionId, kbase, config, env);
ProcessInstance processInstance = ksession.getProcessInstance(1); // i get the trucial
process instance
But what can i do to make the process instance go on?
Anyone can help? :(
Thanks!
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10:01 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Esteban Aliverti [http://community.jboss.org/people/eaa] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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In jBPM5, when you start a process, it executes all the nodes it can. If you don't
have any wait-state, then the process will be completed when the session.startProcess()
method returns.
There are 3 ways (somebody please correct me if I'm forgeting someone) to define
wait-points:
1. Asyncronous WorkItemHandlers in your Service Task Nodes:
When you define a Service Task in your process, you need to assign a handler for it. This
handler could be synchronous or asynchronous. It will be synchronous only if you invoque
workItemManager.completeWorkItem() inside handler's executeWorkItem() method. The only
difference with asynchnornous handlers is that they don't complete the work item
inside. They delegate this behaviour to an external mechanism.
When the process finds a Service Task Node, its executes the associated handler. If the
handler conpletes the work item, the execution continues. If the handler doesn't
complete the work item, the process reaches a wait-state (if there are no more parallel
paths to continue with). When the process reaches a wait-state, it state is persisted (if
you are using persistence, of course :p ).
Asynchronous work item handlers are good for (time) expensive calls to external systems.
If you don't know how long the external sytem will take to respond, then you could use
an asynchronous work item handler. The process will call the external system, everythng is
going to be persisted and you can even dispose you ksession and stop the Thread that
performed the startProcess() call. You still need to have a mechanism for continue the
execution of the process when the external system ends. You will need at least the id of
the ksession and the id of the work item to be able to restore you ksession (
JPAKnowledgeService.loadStatefulKnowledgeSession() ) and to complete the work item (
ksession.getWorkItemManager().completeWorkItem()). The completeWorkItem() method wil
execute as many nodes as it can until it reaches a new wait-point or until the process
finishes.
2. Human Task Nodes: Human tasks are handled like asynchronous Work Items by jBPM5. jBPM5
already comes with a WorkItemHandler implementation for Human Tasks: WSHumanTaskHandler.
This handler will communicate with a Task Service (also provided by jBPM5) and create a
new Task in it. Then, it will wait for someone (using Human Client API) to complete/cancel
the task.
3. External Events: You can define external events handlers in your process using an
intermediateCatchEvent. Then, from outside your process you can signal the event using
ksession.signalEvent() method. If you combine a intermediateCatchEvent with a converging
parallel gateway, you get a wait-state.
I have a set of simple tests that show some of the things I have mentioned here. You can
download and try them from here:
https://github.com/esteban-aliverti/JBPM-Samples
https://github.com/esteban-aliverti/JBPM-Samples
Best Regards,
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2:50 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Mauricio Salatino [http://community.jboss.org/people/salaboy21] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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That's right!
Check out the examples located here too:
https://github.com/Salaboy/Drools_jBPM5-Training-Examples
https://github.com/Salaboy/Drools_jBPM5-Training-Examples
Please give us feedback about them if you find them useful :)
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9:24 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
cheney-dut [http://community.jboss.org/people/cheney-dut] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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Thanks! These exampls are useful. But the process is ended in one testCase.
Now the scene is that i generate one process instance in a testCase and i want to make it
go on in another.
How?
Have any suggestion!?
Thank you!
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9:32 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Esteban Aliverti [http://community.jboss.org/people/eaa] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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--------------------------------------------------------------
If you want to start a process in one test and complete it in another, you will need to
follow these steps:
* Your process must have a wait-state. If it doesn't the process will start and end in
the startProcess() call.
* You need to enable persistence. When the process reaches the wait-state in the first
test it will be persisted in the DB.
* The second test needs to know the session id generated in the first test. You can get
this id from the session object created in the first test. You wil need to store it in a
place reachable by the second test. If you want to keep it simple, just use a static
variable.
* Whithin the first test, your process will eventually execute the Handler you have
configured for your Work Item. This handler will need to store the workItem id somewhere
(again, in a place reachable by test number 2)
* In the second test, using the session id stored in th efirst test, you need to retrieve
the session from the database. The best way to do this is using JPAKnowledgeService.
* Once you have the session, you need to call
session.getWorkItemManager().completeWorkItem() using the work item id previously saved.
Best Regards,
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10:06 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
cheney-dut [http://community.jboss.org/people/cheney-dut] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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--------------------------------------------------------------
Taking your advise, i store the session id and the work item id and can complete a process
instance which has only one Huam Task. When my process has one more and the process
instance reached the second Huam Task node, i can get an exception:
2011-04-18 10:59:17,773 ERROR [org.drools.persistence.SingleSessionCommandService] - Could
not commit session
org.drools.WorkItemHandlerNotFoundException: Could not find work item handler for Human
Task
at
org.drools.persistence.jpa.processinstance.JPAWorkItemManager.throwWorkItemNotFoundException(JPAWorkItemManager.java:60)
at
org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:55)
at
org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:102)
at
org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:122)
at
org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:186)
at
org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:150)
at
org.jbpm.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:47)
at
org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:162)
at
org.jbpm.workflow.instance.node.StateBasedNodeInstance.triggerCompleted(StateBasedNodeInstance.java:143)
at
org.jbpm.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:206)
at
org.jbpm.workflow.instance.node.HumanTaskNodeInstance.triggerCompleted(HumanTaskNodeInstance.java:90)
at
org.jbpm.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:268)
at
org.jbpm.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:244)
at
org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:333)
at
org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:119)
at
org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:69)
at
org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:32)
at
org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:295)
at
org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:146)
at jbpm.demo.bpm.process.PersistenceTest.testProcessGoOn(PersistenceTest.java:144)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at
org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
What's the matter? How to deal?
Thanks!
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7:20 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Esteban Aliverti [http://community.jboss.org/people/eaa] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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Ups... I forgot to tell you something :) . Work Item Handlers bindings are not persisted.
So each time you restore your session, you need to configure the handlers again using
ksession.getWorkItemManager().registerWorkItemHandler(id, handler);
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9:10 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
cheney-dut [http://community.jboss.org/people/cheney-dut] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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That is very good. Thank you!
But i have another question that i can't find the end information of the process
instance ended, such as the end_date field in processinstancelog table which is null.
Why? Or what i have to do?
Looking forward to your reply!
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9:14 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Esteban Aliverti [http://community.jboss.org/people/eaa] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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When a process instence ends, its information is deleted from the data base. AFAIK, you
will need to use jbpm-bam to get execution history.
Best Regards,
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8:49 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
cheney-dut [http://community.jboss.org/people/cheney-dut] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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It's my mistake. i start process with jbpm-bam, but do not use it when make then
process instance go on.
Hhe! Thank you!
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7:23 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Melih Cetin [http://community.jboss.org/people/mscetin] created the discussion
"Re: How to make a process instance go on with jBPM5?"
To view the discussion, visit: http://community.jboss.org/message/620092#620092
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Hi,
I restore a session using JPAKnowledgeService.loadStatefulKnowledgeSession (copy/paste
from org.jbpm.integration.console.CommandDelegate which looks like a workaround) and
re-registering work item handlers using WorkItemManager.registerWorkItemHandler method.
What I notice is; these handlers are invoked for any newly created process instance but
they are not invoked for process instances created before re-storing the session. (Human
Task handler - CommandBasedWSHumanTaskHandler works with no problem though). Do I need to
do anything extra to associate existing process instances with the handlers?
I am testing this scenario by deploying a web application that uses jBPM to Glassfish,
enabling persistence and stopping and starting the application server in between.
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11:27 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Donald Walters [http://community.jboss.org/people/dondragon2] created the discussion
"Re: How to make a process instance go on with jBPM5?"
To view the discussion, visit: http://community.jboss.org/message/624084#624084
--------------------------------------------------------------
Hi,
I want to implement the same wait-state but without using the database. I need everything
to be in memory.
Currently, I have the following definition in the XML
<intermediateCatchEvent id="_5" name="_5" >
<timerEventDefinition>
<timeDuration>60s</timeDuration>
</timerEventDefinition>
</intermediateCatchEvent>
What I want to achieve is that the process waits for x minutes until some external event
to complete the subsequent activities or end the process instance if the time elapses. How
can i achieve this without JPA?
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11:33 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Mauricio Salatino [http://community.jboss.org/people/salaboy21] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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if you don't configure persistence it will work. Cheers
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12:10 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Donald Walters [http://community.jboss.org/people/dondragon2] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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But how would I load the session in order to signal the event ?
Because the JPAKnowledgeService will not be used.
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1:41 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Sebastien Lelarge [http://community.jboss.org/people/slelarge] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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@ Melih> did you find a solution to restore WorkItemhandler for ProcessInstances
created before session restore ?
I am interested in knowing hwo to do that.
thanks
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9:25 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Melih Cetin [http://community.jboss.org/people/kafsinkaf] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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Hi Sebastien,
We found out that calling only TaskClient.complete is not sufficient to progress the
process instance that was waiting at a Human Task node. You need to call
WorkItemManager.completeWorkItem as well. Attached is the piece code that we used. It was
modified a bit to remove the internal dependencies. I hope it helps you.
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10:04 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Sebastien Lelarge [http://community.jboss.org/people/slelarge] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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Thank you for your answer Melih. I've tried this yesterday but it caused bad results
and Transaction related exceptions when I tried to completeWorkItem from the method where
I call the complete command with the TaskCient.
hopefully, I have just found the reason why my process instances refused to go on after
session restore and I will share this below.
Now things seems to be going well after restarts
It is possible that some users are in the same situation.
In mine, the jBPM engine is embedded in a web application and the Human Task server is
started from a dedicated servlet (as suggested by bpmn2user in another post) that launches
it as a separate thread.
On the other side, the jBPM engine is initialized (knowledge base and session creation) at
application startup in a ServletContextListener.
What I didn't realize at this time is that the Human Task server is not yet started
when I register the "Human Task" worktitem with the ksession...
It seems (but I am not sure) that the *register command tries to contact the HT server but
logs nothing whatever connection result.*
In the case where the HT server is not available, then the WorkItemHandler cannot wake up
the persisted workitems correctly. Particularly, when I tried to complete a task, the Task
Server returned a "No listeners found" message telling that it didn't have
signals to send back to the workflow engine.
Now that I know that, I have rewritten my HumanTask Server servlet in order to proceed to
WorkItem registration after the server is correctly started.
And things are working without manually completing workItem when completing tasks
Here is a snippet of my start HT server servlet
logger.info("Starting jBPM Human Task Server...");
taskServerDaemon.startServer(this.port);
logger.info("jBPM Human Task Server started.");
// Get the Knowledge Session initialized at application startup from app context
// and register Human Task WorkItem
logger.info("Registering Human Task Service for jBPM session.");
StatefulKnowledgeSession ksession =
(StatefulKnowledgeSession)this.getServletContext().getAttribute(ksessionAttribute);
if (ksession == null) {
logger.error("The retrieved ksession is null. Cannot continue");
} else {
CommandBasedWSHumanTaskHandler wsht = new
CommandBasedWSHumanTaskHandler(ksession);
try {
hostname = InetAddress.getLocalHost().getHostName();
} catch (UnknownHostException uhe) {
logger.error("Unable to resolve local host IP");
}
wsht.setConnection(this.hostname, this.port);
wsht.connect();
ksession.getWorkItemManager().registerWorkItemHandler("Human Task",
wsht);
logger.info("Human Task Service for jBPM session " +
ksession.getId() + " is registered");
}
I hope this can help
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10:43 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Donald Walters [http://community.jboss.org/people/dondragon2] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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I had to use to JPAKnowledgeService ans store the session id elsewhere.
EntityManagerFactory emf = Persistence.createEntityManagerFactory("com.test");
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
env.set(EnvironmentName.TRANSACTION_MANAGER,
TransactionManagerServices.getTransactionManager());
ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(sessionId, kbase,
null, env);
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6:44 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Sridhar J [http://community.jboss.org/people/sridhar532] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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Hi , I am also facing a similar issue. After lauching a process in a session , if i
Restart my Human Task Server and try Completing the Task by loading the same session,
Tasks get Completed but the Workflow does not move forward. Does somebody have any
thoughts ?
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6:36 a.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Marie MM [http://community.jboss.org/people/mariemm] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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Hi,
it is really necessary (or recommended) to remember sessionId when starting process in one
test and finishing in another?
It works also when you create always new session.
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9:17 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
cheney-dut [http://community.jboss.org/people/cheney-dut] created the discussion
"Re: How to make a process instance go on with jBPM5?"
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Thanks for your reply!
Right now, i take the first methord. And by the way, i have to know the workItem ID,
isn't it? But how to know?
i readed some examples, including your supply! i find that
WorkItemManager.completeWorkItem() is used in the same testCase. In another testCase, how
to get the workItem, or how to complete the workdItem?
WIth the second method, it takes C/S mode. When the jbpm is self-governed, it is userful,
isn't it? But at this time, how to manage the transaction?
Looking forward to your reply!
Thanks!
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9:25 p.m.
New subject: [jBPM] - Re: How to make a process instance go on with jBPM5?
Esteban Aliverti [http://community.jboss.org/people/eaa] created the discussion
"Re: How to make a process instance go on with jBPM5?"
To view the discussion, visit: http://community.jboss.org/message/600500#600500
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Remember that you will need to make an external mechanism to hanlde the result of async
calls. Inside the WorkItemHandler you can get the workItem Id. Two (of the probably
infinite) options that you have are:
1. Pass the id (along with the session Id) to the external system. The external system,
when finishes, can use those values to perform a call to your system and complete the work
item.
2. Create a complete isolated mechanism for handling async calls to external systems. In
this scenario, you could call the external system on your WorkItem Handler and then notify
this third system (the isolated system I have mentioned before) that a new
"task" is running. When the external system completes its work, it notifies this
to the same third system. When a task is completed, the third system will notify your
system about it.
Best Regards,
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participants (8)
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cheney-dut -
Donald Walters
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Esteban Aliverti
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Marie MM
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Mauricio Salatino
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Melih Cetin
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Sebastien Lelarge
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Sridhar J