I am relatively to JBoss/jBPM but have been having good sucess with it so far.
However I have just hit a problem that has had me stumped for the better part
of a day now.
I am using:
- jboss-EJB-3.0_RC5-PFD
- jbpm-3.1
- jboss-4.0.4RC1
Most of it works fine, except I am having trouble with the execution of a jBPM
process invoked from a @Stateless session bean.
I have a process definition deployed into my database that I can successfully
invoke from a method in the stateless session bean. However if I attempt to
trigger a custom ActionHandler from the process, jBPM complains that it cannot
find the action handler class.
Here is an extract of my processdefinition.xml file:
anonymous wrote :
| | <start-state name="start">
| | <transition name="" to="Invoke Call"></transition>
| | </start-state>
| | <state name="Invoke Call">
| | <event type="node-enter">
| | <action name="createCall" config-type="field"
class="com.vieo.ccs.process.actions.CreateCallActionHandler" />
| | </event>
| | <transition name="ACTIVE" to="Setup Success"></transition>
| | </state>
| |
The exception I am getting is as follows:
anonymous wrote :
| 18:30:00,156 ERROR [GraphElement] action threw exception: couldn't get
value for file
'classes/com/vieo/ccs/process/actions/CreateCallActionHandler.class'
org.jbpm.JbpmException: couldn't get value for file
'classes/com/vieo/ccs/process/actions/CreateCallActionHandler.class'
| at
org.jbpm.file.def.FileDefinition.getBytes(FileDefinition.java:186)
| at
org.jbpm.instantiation.ProcessClassLoader.findClass(ProcessClassLoader.java:55)
| at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
| at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
| at
org.jbpm.instantiation.Delegation.instantiate(Delegation.java:140)
| at
org.jbpm.instantiation.Delegation.getInstance(Delegation.java:125)
| at
org.jbpm.instantiation.Delegation$$FastClassByCGLIB$$6bae1598.invoke()
| at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
| at
org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:161)
| at
org.jbpm.instantiation.Delegation$$EnhancerByCGLIB$$1e6cb7ea.getInstance()
| at org.jbpm.graph.def.Action.execute(Action.java:122)
| at
org.jbpm.graph.def.GraphElement.executeAction(GraphElement.java:235)
| at
org.jbpm.graph.def.GraphElement.executeActions(GraphElement.java:212)
| ...
| <stuff cut>
| ...
| Caused by: org.jbpm.JbpmException: file
'classes/com/vieo/ccs/process/actions/CreateCallActionHandler.class' not found
in db
| ...
| <more stuff cut>
| ...
| 18:30:00,156 ERROR [StartProcessActionHandlerBean] JBPMException:
org.jbpm.graph.def.DelegationException
|
Now, to me this looks like jBPM cannot find my ActionHandler class
(com.vieo.ccs.process.actions.CreateCallActionHandler) so I wrote a little bit
of code in my stateless session bean to test it:
anonymous wrote :
| | try {
| | ClassLoader classloader =
this.getClass().getClassLoader();
| | Class systemC =
classloader.loadClass("com.vieo.ccs.process.actions.CreateCallActionHandler");
| | logger.info("Loaded system class: " + systemC);
| | } catch (ClassNotFoundException e) {
| | logger.error("Error system class loader! : " +
e);
| | }
| | try {
| | // Test org.jbpm.util.ClassLoaderUtil
| | Class jbpmC =
ClassLoaderUtil.loadClass("com.vieo.ccs.process.actions.CreateCallActionHandler");
| | if( jbpmC != null ) {
| | logger.info("Loaded jbpm class: " +
jbpmC);
| | } else {
| | logger.info("Loaded jbpm class: null");
| | }
| | } catch (JbpmException e) {
| | logger.error("Error jbpm class loader! : " + e);
| | }
| |
And sure enough, I can successfully access this class from my code, but for
some reason if I use the jBPM ClassLoader then it cannot be found!
Here is the output:
anonymous wrote :
| 18:30:00,109 INFO [StartProcessActionHandlerBean] Loaded system class:
class com.vieo.ccs.process.actions.CreateCallActionHandler
| 18:30:00,125 ERROR [StartProcessActionHandlerBean] Error jbpm class loader!
: org.jbpm.JbpmException: class not found
'com.vieo.ccs.process.actions.CreateCallActionHandler'
|
My understanding is that, for some reason, jBPM cannot access my classes (which
are currently deployed as a .jar within my .ear package).
How do I make the classes in my .ear visible to the installed jBPM instance?
(jBPM was installed using 'ant -f build.deploy.xml create.jbpm.configuration'
and I'm using the jbpm JBoss configuration).
Thanks for your help!
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