This paper explains how to diagnose and find the source of Java memory leaks on IBMR WebSphere Application Servers 3.5, 4.01 and 5.0 in the distributed and z/OS environments. It presents a general methodology, explains how to gather diagnostic data, describes tools for analyzing the data and gives examples of use. This paper is the first in a two-part series exploring how to diagnose Java memory leaks on various IBM platforms. Due to the wide diversity of tools and techniques available, the authors have been forced to make some drastic choices about which ones are presented in these papers. Tools and techniques that are not presented within the scope of the paper are by no means invalid.
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