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The latest release of the IBM JRE for Java SE 6 enhances IBM's class sharing feature first introduced in version 5. Performance analysts Adam Pilkington and Graham Rawson detail the changes, which include improvements in application startup times and memory utilization.

The multitenant nature of Software as a Service applications makes security an essential concern. This article introduces a practical approach to securing a multitenant Java application with the Spring Security framework combined with Apache Directory Server. The authors present a multitenant example Web application to demonstrate this approach.

Rod Johnson writes, "you do get a better result if you are prepared to rework things when necessary. We had a clear vision for our maintenance policy: balancing the needs of the community with those of enterprise users and the creators of Spring, for the benefit of all. We didn't get the balance quite right first time, and it's time for some refactoring."

In this last article of the series, Reza Rahman will talk about standardized global JNDI names for Session Beans and EJB 3.1 Embeddable Containers for Java SE environments. All of this is just a peek into the inner workings of the JCP so that you have a chance to provide feedback.