Monday, October 18, 2004

Breaking Classloader Hierarchy

Find a way out of the ClassLoader maze "Thread context classloaders were introduced in Java 2 Platform, Standard Edition (J2SE). Every Thread has a context classloader associated with it (unless it was created by native code). It is set via the Thread.setContextClassLoader() method. If you don't invoke this method following a Thread's construction, the thread will inherit its context classloader from its parent Thread. If you don't do anything at all in the entire application, all Threads will end up with the system classloader as their context classloader. It is important to understand that nowadays this is rarely the case since Web and Java 2 Platform, Enterprise Edition (J2EE) application servers utilize sophisticated classloader hierarchies for features like Java Naming and Directory Interface (JNDI), thread pooling, component hot redeployment, and so on."
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