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  Tutorial: Designing J2EE Applications for Real-Life Clustered Environments

Designing J2EE Applications for Real-Life Clustered Environments In this article, the authors draw from their practical experience to list and discuss some critical considerations when building J2EE applications so that they can be deployed in a cluste

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Static Variables for Application State
When an application needs to share a state among many objects, a state that needs to have a single instance, the most popular solution is to store the state in a static variable. Many Java applications do it, and so do many J2EE applications -- and that\'s where the problem is. This approach works absolutely fine on a single server, but fails miserably in a cluster. Each node in the cluster would maintain its own copy of the static variable, thereby creating as many different values for the state as the number of nodes in the cluster.


 

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