Maciej Swiderski [https://community.jboss.org/people/swiderski.maciej] created 
the discussion

"Re: How to set UserGroupCallback for Human Task Service client"

To view the discussion, visit: https://community.jboss.org/message/746911#746911

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there is no need to inform task client about the callback implementation. It is 
only relevant to the task service side. Not sure how do you use task service 
but there are several ways of doing that:
* using web application - from 5.3 there is a human task web application that 
exposes ht features of hornetq by default, it is configurable via web.xml and 
its init parameters
* programatically - UserGroupCallbackManager is responsible for callback 
registration
* using system properties - use -Djbpm.usergroup.callback=[your custom callback 
class name] - note that your class must have default constructor
* using property file - use simple property file that will hold a single line 
(or more depending on callback implementation) to bootstrap it when callback 
manager is initiated * file name: jbpm.usergroup.callback.properties
* property name: jbpm.usergroup.callback=your custom class name
* location: org/jbpm/task/identity/ on your classpath


HTH
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