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This article helps you learn about class loaders in general and network class loaders in particular...as well as the security issues that surround them.

When Java was first released to the public in 1995 it came with a web browser (HotJava), written in Java, that had the ability to automatically and dynamically download mini-applications (or applets) when it encountered the tag in an HTML document. Such Applets are loaded on the fly across the network from remote web servers and run inside the browser's Java Virtual Machine (JVM). The mechanism that enabled such dynamic loading is a class loader, which is one of the cornerstones of Java dynamism. Class loaders are responsible for determining when and how classes can be added to a running Java environment, as well as making sure that important parts of the Java runtime environment are not replaced by impostor code.

The JVM default class loader knows how to load classes from the local file system, but what if you want to develop state-of-the-art applications that are capable of loading classes from remote servers? Class loaders can also be used to ensure safety and security of byte codes; for example, you can develop a custom class loader capable of checking a digital signature before executing untrusted foreign code.


This article provides a tutorial on network class loaders, and:

Discusses the class loader mechanism
Offers a flavor of the effort involved in developing network class loaders
Discusses the security issues surrounding network class loaders
Shows how to protect network class loaders from loading malicious code

 

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