code: public void setAttribute(String name, Object o) {
  		if(logger.isDebugEnabled()) {
          	logger.debug("setAttribute - name=" + name + ", object=" + o);
          }
  		if (name == null)
  			throw new NullPointerException("Attribute name can not be null.");
  		this.getAttributeMap().put(name, o);
  	}
docs: /*
  (non-Javadoc)
  @see javax.servlet.sip.SipServletMessage#setAttribute(java.lang.String, java.lang.Object)