GPEngineException: Error filling role when invoking GP from within webdynpr

Question

Hi
I am trying to invoke a guided procedure process (the example Time-Off-process) from within a webdynpro-application. For this, I used the code given here: http://help.sap.com/saphelp_nw2004s/helpdata/en/43/fcdf77fc6510b3e10000000a11466f/frameset.htm. The process can be invoked and starts running if I configure the roles in the design time environment such that the role type is set to "Initiator". However, if I change the role type to "Instantiation defined", I get the following error:
"Error filling role role.overseer of role type 3 during instantiation".
The stack trace shows that a GPEngineException has been thron:
com.sap.caf.eu.gp.exception.api.GPEngineException: Error filling role role.overseer of role type 3 during instantiation
     at com.sap.caf.eu.gp.process.rt.impl.GPRuntimeManager.checkRoleList(GPRuntimeManager.java:307)
     at com.sap.caf.eu.gp.process.rt.impl.GPRuntimeManager.startProcess(GPRuntimeManager.java:125)
In my code, I assign roles to users exactly as described in the above mentioned document. Here's the code snippet:
     //Assign users to each role:                         
     IGPRuntimeManager rtm = GPProcessFactory.getRuntimeManager();
     IGPProcessRoleInstanceList roles =
     rtm.createProcessRoleInstanceList();
     int rolenum = process.getRoleInfoCount();
     for (int i = 0; i < rolenum; i++) {
          String roleName = process.getRoleInfo(i).getRoleName();
          //create a new role instance by specifying the role's unique name
          IGPProcessRoleInstance roleInstance =
          roles.createProcessRoleInstance(roleName);
          //add the new role to the assignment list
          roles.addProcessRoleInstance(roleInstance);
What could be the problem here? I have searched all over the forum, but didn't find any hint. It might as well be that the error doesn't mean anything. I got a similar problem earlier which was solved by activating the process in the GP-Designtime. It would be great if anybody had an idea as to what I could do here. Anything could be a helpful suggestion!
Thanks very much!
Best regards
Bettina Hepp

Answer 1

This error is thrown if the role configuration in the guided procedure design time doesn't correspond to the role assignment during process instantiation:
1. If role should be assigned at process instantiation, tick "overwritable at runtime", set role to "Initiation defined" and do assign a user to the role when you invoke the process.
2. If role should be the process initiator, set role to "Initiator". In this case it is not possible to assign a user to this role when invoking the process.
3. There is a third role type: "Runtime defined", haven't tried that so far.