It’s recommended practice that all tag handlers implement a release method, which releases resources allocated during the execution of the tag handler. The release method of MapTag as follows:
public void release() { super.release(); current = null; styleClass = null; actionListener = null; immediate = null; action = null; }
This method first calls the UIComponentTag.release method to release resources associated with UIComponentTag. Next, the method sets all attribute values to null.