Emmanuel Cecchet et al

 Performance Scalability of J2EE application servers.  Test effect of: ◦ Application Implementation Methods ◦ Container Design ◦ Communication Layer ◦ Persistence Management  Using an ebay like auction site server benchmark.

 J2EE ◦ Java 2 Platform Enterprise Edition ◦ Java API’s to build dynamic content web sites. ◦ Scalable run-time infrastructure to host.  EJB ◦ Enterprise JavaBeans ◦ Managed server-side component architecture for modular construction of enterprise applications. ◦ Encapsulates the business logic of the application. ◦ Specifically for multi-tier client/server systems. ◦ Containers are responsible for providing:  Component pooling and lifecycle management  Client session management  Database connection pooling  Persistence  Transaction management  Authentication and access control.

Apache; Tomcat; JBoss,JOnAS; MySQL

 Bean developer decides to manage persistence by: ◦ Bean-Managed Persistence (BMP)  SQL is embedded in bean code.  Only database connection pooling and transaction management services of the container are used. ◦ Container-Managed Persistence (CMP)  A deployment descriptor contains a one-to-one mapping between bean instance variables and database columns.  The container uses the descriptor to generate the necessary SQL statements and ensure concurrency control in the database.

 Test both with and without optimizations.

 Entity beans that map data stored in the database. ◦ (usually one entity bean instance per database table row)  Session beans that are used to: ◦ Perform temporary operations (stateless session beans). ◦ Represent temporary objects (stateful session beans).

1. Dynamic Proxy approach ( Jboss ). 1.Container Classes are generated at run time making extensive use of reflection. 2. Pre-Compilation ( JOnAS and most commercial implementations ). 1.Classes are generated during deployment reducing run time reflection.

 Java servlets-only (for comparison)  EJB ◦ Stateless Session Beans ◦ Entity Beans  Container-managed persistence  Bean-managed persistence  Session Façade beans ◦ EJB 2.0 Local Interfaces (entity beans with only local interfaces and session beans with remote interfaces)

CMP & BMP

Session Façade & EJB 2.0 local interfaces