Sun GlassFish Enterprise Server 2.1 Developer's Guide

Eager Loading of Field State

By default, the EJB container loads the state for all persistent fields (excluding relationship, BLOB, and CLOB fields) before invoking the ejbLoad method of the abstract bean. This approach might not be optimal for entity objects with large state if most business methods require access to only parts of the state.

Use the fetched-with element in sun-cmp-mappings.xml for fields that are used infrequently. See fetched-with in Sun GlassFish Enterprise Server 2.1 Application Deployment Guide.