Understanding Classloaders: log4j in a J2EE Environment - O'Reilly Media: "Classloaders, as the name suggests, are responsible for loading classes within the JVM. Before your class can be executed or accessed, it must become available via a classloader. Given a class name, a classloader locates the class and loads it into the JVM. Classloaders are Java classes themselves. This brings the question: if classloaders are Java classes themselves, who or what loads them?
When you execute a Java program (i.e., by typing java at a command prompt), it executes and launches a native Java launcher. By native, I mean native to your current platform and environment. This native Java launcher contains a classloader called the bootstrap classloader. This bootstrap classloader is native to your environment and is not written in Java. The main function of the bootstrap classloader is to load the core Java classes."
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