The latest major Java release (Java SE 6, aka Mustang), is now in its beta version.
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This new version is not as major an update as Java 5, it does come with a few interesting new features. Undoubtedly, one of these is its support for scripting languages.
Scripting languages such as PHP, Ruby, JavaScript, Python (or Jython), and the like are widely used in many domains, and are popular because of their flexibility and simplicity. Scripts are interpreted, not compiled, so they can be easily run and tested from the command line. This tightens the coding/testing cycle, and increases developer productivity. They are generally dynamically typed, and have expressive syntaxes that allow an equivalent algorithm to be written much more concisely than in Java. They are also often fun to work with.
Using scripting languages from Java can be useful in many situations, such as providing extensions to your Java application so that users can write their own scripts to extend or customize the core functionalities. Scripting languages are both simpler to understand and easier to write, so they can be ideal to give (technical) end users the possibility to tailor your product to their needs.
Many independent scripting packages have been available for Java for some time, including Rhino, Jacl, Jython, BeanShell, JRuby, and others. The novelty is that Java 6 provides built-in support for scripting languages via a standard interface.
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