Hi, Demian!
First, in script task I'm creating map like this:
Map<String, Object> content = new java.util.HashMap<String, Object>();
content.put("employee", employee);
//Where employee is my class passes into the process as parameter;
kcontext.setVariable("content", content);
Than, in Jboss Tools bpmn editor in properties of HumantTask I'm setting #{content} value to Content propety;
WBR, Aliaksei