David Raal

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Service-oriented architectures (SOA) provide numerous benefits: reuse of business logic by many clients, location transparency of business logic, simplified unit testing, better scalability through distributed and load-balanced processing, and the composition of new services from existing services. Enterprise JavaBeans are a favorite platform on which to base service-oriented architectures because of their enterprise-class features. As many new SOA applications are now developed on the J2EE platform, a problem arises: how to maintain 100% availability while deploying maintenance fixes and new versions of the services. Most application server vendors do not recommend hot deployment of applications in production; problems may occur with unloading classes, class loaders, and resources being used by existing deployments. Instead, the vendors recommend restarting the serv... (more)