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  • Ashishkumar Patel thinks this is interesting:

Service

From

Cover of OCM Java EE 6 Enterprise Architect Exam Guide (Exams 1Z0-807, 1Z0-865 & 1Z0-866), 3rd Edition

Note

Also called "Session Facade"

1) Fine-grained, reusable logic in an EJB with local access only, product of decomposition
2) Used by a Service Facade
3) Usually @Stateless s Tx=Mandatory
4) Uses EntityManager and/or specialized DAOs

Ref : https://theholyjava.wordpress.com/2010/05/08/book-real-world-java-ee-patterns-rethinking-best-practices-review-digest/

For more details on Session Facade , Please check Core J2EE design pattern