Description of problem:

The error message says "Error when loading properties for DB user group callback" instead of JAAS user group callback. This is probably a copy/paste error.

See snipp:
{code}
	public JAASUserGroupCallbackImpl() {
		// use default JBoss AS role principle name
		this("Roles");
		
		String propertiesLocation = System.getProperty("jbpm.usergroup.callback.properties");
        
        if (propertiesLocation == null) {
            propertiesLocation = DEFAULT_PROPERTIES_NAME;
        }
 
        InputStream in = this.getClass().getResourceAsStream(propertiesLocation);
        if (in != null) {
            Properties config = new Properties();
            try {
                config.load(in);
                
                this.rolePrincipleName = config.getProperty("jaas.role.principle.name");
            } catch (IOException e) {
                logger.error("Error when loading properties for DB user group callback", e);
                config = null;
            }
        }
	}
{code}