POJOs should implements Externalizable?

Hi, We are using DocumentProperties (DP) to model our POJOs (Most of the POJO attributes are defined as an entry within the DP in order to have an easy schema evolution with backward compatibility). It is possible to know how the DocumentProperties implements the write/read method from the Externalizable interface? Is it recomended to implements the Externalizable interface on all the POJOs with the new versions? Does GS ignores the POJO Externilizable implemententation? Any recomendation/advice? http://docs.gigaspaces.com/release_notes/100upgrading.html Environment: XAP 10.2.0 with Java 8 Thanks in advance, Manuel Vieda