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Modern J2EE applications are typically based on highly distributed architectures comprising multiple components deployed in a clustered environment. This makes it difficult for deployers to estimate the capacity of the deployment environment needed to guarantee that Service Level Agreements are met. This paper looks at the different approaches to this problem and discusses the difficulties that arise when one tries to apply them to large, real-world systems. The authors study a realistic J2EE application (the SPECjAppServer2002 benchmark) and show how analytical models can be exploited for capacity planning.
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