O'Reilly - Java Message Service

9.6.2 Next Version
Java Message Service
The next version of WebLogic server will support JMS 1.0.2, clustering of JMS services, a
web console based on the Java Management Extension ( JMX), and 2PC. In addition, the
next version of WebLogic will include support for the EJB message-driven bean discussed
in Chapter 7. The next version requires that JMS clients run on the JDK 1.2 or JDK 1.3
Virtual Machine, while the servers must run on the JDK 1.3 Virtual Machine.
9.7 ExoLab: OpenJMS
The ExoLab Group is a major contributor of open source J2EE servers. OpenJMS is their
JMS server.
9.7.1 Beta Version 0.4
The OpenJMS project was started by Jim Alateras and Jim Mourikis. It is sponsored by
The ExoLab Group. OpenJMS was developed to the JMS 1.0.2 specification and supports
both the pub/sub and p2p JMS messaging models. OpenJMS is currently in development
but its source code is freely available and can be used in testing and learning about JMS.
Obviously, the final version will be more complete. The server and clients are written in
Java and can run on any platform with a Java 2 Virtual Machine. OpenJMS is based on a
centralized hub-and-spoke messaging architecture. Clustering is not currently supported,
so scalability and load balancing are limited to a single server instance.
Persistent messages are supported through any relational database that can be accessed
with JDBC. Only local transactions are supported, so OpenJMS cannot participate as a
resource in a two-phase commit. OpenJMS does not currently support firewall tunneling or
any level of authentication or access control.
9.7.2 Version 1.0
In the final release, clustering will be supported through a server-to-server communication
protocol. OpenJMS will also support IP multicast and the HTTP 1.1 protocol, two-phase
commit (as a XA resource), firewall tunneling, and security services such as authentication
and access control.
140