The EntityManager API is much simpler to use than the ObjectMap API as it handles many of the relationship management tasks that would normally need to be done manually when using the ObjectMap API. The EntityManager utilizes ObjectGrid maps by using {@link com.ibm.websphere.projector.Tuple} objects. Each entity is associated with a single BackingMap that matches the entity's simple class name. The data within the entity is converted to a key tuple and a value tuple and the tuples are inserted into the map. The EntityManager automatically converts entities to and from tuples and interacts with the maps when needed.
Use the {@link com.ibm.websphere.objectgrid.em.ProjectorFactory} to access a {@link com.ibm.websphere.projector.Projector} for advanced functionality. @see com.ibm.websphere.projector