public void createForum(Person owner, String name, String description, Group readersGroup, Group writersGroup) {
public void createForum(String name, String description) {
    public void createForum(Person owner, String name, String description, Group readersGroup,	    Group writersGroup) {	if (hasForumWithName(name)) {	    throw new DomainException("executionCourse.already.existing.forum");	}	ExecutionCourseForum executionCourseForum = new ExecutionCourseForum(owner, name, description);	this.addForuns(executionCourseForum);    }