topic Re: serviceTask can not instantiate class in Alfresco Archive

serviceTask can not instantiate class

eranriesenfeld — Sun, 22 Aug 2010 03:15:42 GMT

hi activiti forum!at first i want to send my congratulations for the work done so far, on the activiti project within the last ~4(?) month!I am testing around with activiti and have a problem right now, when executing a process with a serviceTask contained. in my bpmn20.xml I had defined a service T

Re: serviceTask can not instantiate class

tombaeyens — Mon, 23 Aug 2010 06:57:22 GMT

yes it is

Re: serviceTask can not instantiate class

jbarrez — Wed, 25 Aug 2010 12:43:05 GMT

That is the easiest way to get it working, yes (If you are testing the process through Explorer).

If you are building your own application, you must make sure that the class is on the same classpath as on which you create the process engine on.

Re: serviceTask can not instantiate class

jeff1 — Thu, 26 Aug 2010 01:51:59 GMT

I think it would be great if we can obtain the existing service objects of the application with serviceTask. : )

Re: serviceTask can not instantiate class

tombaeyens — Thu, 02 Sep 2010 09:06:47 GMT

I think it would be great if we can obtain the existing service objects of the application with serviceTask. : )

Jeff, can you explain that suggestion a bit more elaborate?

Re: serviceTask can not instantiate class

jeff1 — Thu, 02 Sep 2010 11:38:21 GMT

so sorry for my english, tom : (

I said that because in my mind(I don't know what it is like now), jbpm4 uses relfect to invoke the target java method, which may newly create a target object, for example:


<java name="greet"
        class="org.jbpm.examples.java.JohnDoe"
        method="hello"
        var="answer">

of course, we can use jndi to obtain object in jbpm4 too.

now, let's assume that there are some domain service objects inside my application, which are stateful and have been initiated with specific business logic, how can I access such objects with service task? since I can not newly create one.
need I manually expose them to somewhat like jndi, do some integration work, or I can access them more conveniently.

Re: serviceTask can not instantiate class

jbarrez — Mon, 06 Sep 2010 10:45:47 GMT

The service task does indeed do the instantiation, which has as a consequens that the beans are stateless.

However, I do believe that when you use Spring for example, you can reference a stateful bean from the service task (I havent tried this yet, though)

Re: serviceTask can not instantiate class

rrabbit — Sat, 02 Oct 2010 17:06:14 GMT

That is the easiest way to get it working, yes (If you are testing the process through Explorer).

is there any way to update the jar file in the tomcat/lib folder without having to restart tomcat?

Re: serviceTask can not instantiate class

jbarrez — Wed, 06 Oct 2010 08:34:40 GMT

No, unfortunately not. That's the way Tomcat works (and JBoss too and probably other app servers too).

When you have your own web application with activiti jar inside, you can however hot deploy you war, and that will give you what you need.