Future Development - Red Hat APPLICATION SERVER - JONAS Manual

Chapter 1. Java Open Application Server (JOnAS): a J2EE Platform
In addition to clustering solutions, JOnAS provides many intrinsic mechanisms to ensure high scalable
and efficiency:
A pool of stateless Session Bean instances
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A pool of Entity Bean instances, configurable for each Entity Bean within its deployment descriptor
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Activation/passivation of entity beans (passivation can be controlled through the management con-
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sole)
Pools of connections, for JDBC, JMS, J2EE CA connectors
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A pool of threads for message-driven beans
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Session Bean timeout can be specified at deployment
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A "shared" flag in the specific deployment descriptor of an Entity Bean that indicates whether the
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persistent representation of this Entity Bean is shared by several servers/applications, or whether it
is dedicated to the JOnAS server where it is loaded. In the latter case, the optimization performed
by JOnAS consists of not reloading the corresponding data between transactions.
The usual EJB 1.1 "isModified" (or "Dirty") mechanism is available, for avoiding storage of un-
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modified data.
Some benchmarks and JOnAS Use cases have already proven that JOnAS is highly scalable. Re-
fer to the Rubis http://www.cs.rice.edu/CS/Systems/DynaServer/perf_scalability_ejb.pdf results or the
OpenUSS Use case (http://openuss.sourceforge.net/openuss/). Rubis is a benchmark for e-commerce
J2EE applications, which now belongs to the ObjectWeb JMOB (Java Middleware Open Benchmark-
ing) project (http://www.objectweb.org/jmob/index.html). OpenUSS is an operational university por-
tal that has approximately 20,000 users.

1.6. Future Development

As an open source implementation of a J2EE server, JOnAS is constantly evolving to satisfy user
requirements and to follow the related standards. These are the current JOnAS plans:
J2EE 1.4 compliance, JOnAS being currently in the process of passing the Sun J2EE Compatibility
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Test Suite.
JOnAS administration will be enhanced by completing the concept of management domain, and by
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introducing cluster management facilities.
Addressing performance issues by developing workbenches and by producing tuning guides.
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Support of "Web Services" and tools for developing those services.
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Deployment APIs as specified in JSR88 (J2EE 1.4) will be supported as a result of the Ishmael
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project.
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