change the == with .equals for better proxy comparison handling.

public boolean hasBlockingTaskInstances(Token token) {
boolean hasBlockingTasks = false;
if (taskInstances!=null) {
Iterator iter = taskInstances.iterator();
while ( (iter.hasNext())
&& (! hasBlockingTasks)) {
TaskInstance taskInstance = (TaskInstance) iter.next();
if ( (! taskInstance.hasEnded())
&& (taskInstance.isBlocking())
&& (taskInstance.getToken()==token) )

}
}
return hasBlockingTasks;
}