Java class loader example

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Java Classloader is a part of the Java Runtime Environment that dynamically loads Java classes into the Java Virtual Machine. classes are only loaded on creation of an object.

Three class loaders are used:


  1. Bootstrap class loader
  2. Extensions class loader
  3. System class loader


The bootstrap class loader loads the core Java libraries located in the <JAVA_HOME>/jre/lib directory. This class loader, which is part of the core JVM, is written in native code.

The extensions class loader loads the code in the extensions directories (<JAVA_HOME>/jre/lib/ext, or any other directory specified by the java.ext.dirs system property). It is implemented by the sun.misc.Launcher$ExtClassLoader class.

The system class loader loads code found on java.class.path, which maps to the CLASSPATH environment variable. This is implemented by the sun.misc.Launcher$AppClassLoader class.

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