http://blog.xebia.com/2009/07/13/jpa-implementation-patterns-wrap-up/ 차근 차근 봐둬야 할 글목록이 있군요. Basic patterns Data Access Objects Saving (detached) entities Retrieving entities Removing entities Service Facades and Data Transfers Objects Advanced patterns Bidirectional assocations Lazy loading Bidirectional associations vs. lazy loading Using