code: public static WampSession currentAttributes() throws IllegalStateException {
  		WampSession attributes = getAttributes();
  		if (attributes == null) {
  			throw new IllegalStateException("No thread-bound WampSession found. "
  					+ "Your code is probably not processing a client message and executing in "
  					+ "message-handling methods invoked by the WampAnnotationMethodMessageHandler?");
  		}
  		return attributes;
  	}
docs: Return the WampSession currently bound to the thread or raise an
  {@link java.lang.IllegalStateException} if none are bound..
  @return the attributes, never {@code null}
  @throws java.lang.IllegalStateException if attributes are not bound