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Introduction The Java TM 2 Platform Standard Edition (J2SE TM platform) is used for a wide variety of applications from small applets on desktops to web services on large servers. In the J2SE platform version 1.4.2 there were four garbage collectors from which to choose but without an explicit choice by the user the serial garbage collector was always chosen. In version 5.0 the choice of the collector is based on the class of the machine on which the application is started. This “smarter choice” of the garbage collector is generally better but is not always the best. For the user who wants to make their own choice of garbage collectors, this document will provide information on which to base that choice.