You need to set the Content variable.
http://community.jboss.org/servlet/JiveServlet/downloadImage/2-604049-16338/450-270/ScreenHunter_01+May.+08+10.32.gif
You might want to look at the examples:
http://community.jboss.org/people/bpmn2user/blog/2011/02/21/jbpm5-example-for-forms-with-variables
http://community.jboss.org/people/bpmn2user/blog/2011/04/03/jbpm5-human-task-api-usage-example
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