Chapter 8. System

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Chapter 8. System For the myth is the foundation of life; it is the timeless schema, the pious formula into which life flows when it reproduces its traits out of the unconscious. �Thomas Mann The Java platform�the Java Virtual Machine plus the libraries�contains a tremendous amount of functionality that J2EE relies on as part of its implementation. For example, the hot deployment capability of servlet engines and EJB containers is due entirely to the ClassLoader architecture of the underlying JVM; without it, bouncing the server would be a necessity to load new versions of the code. Java Object Serialization is used implicitly in a number of places throughout the JDK and so becomes a cornerstone of J2EE. And, of course, in order to allow the container to walk and chew gum at the same time (figuratively), J2EE makes heavy use of the Java threading model to provide concurrent execution of incoming client requests. As a result, understanding key parts of the Java platform is an absolute "must" for any Java developer who wants to do serious work in the J2EE platform.

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