Apache Jelly is a Java

Java (programming language)

Java is a programming language originally developed by James Gosling at Sun Microsystems and released in 1995 as a core component of Sun Microsystems' Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities...

 and XML

XML

Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....

 based scripting and processing engine for turning XML

XML

Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....

 into executable code. Jelly is a component of Apache Commons.

Custom XML languages are commonly created to perform some kind of processing action. Jelly is intended to provide a simple XML based processing engine that can be extended to support various custom actions.

Use by Clarity Software

Clarity Software, a product of CA, Inc. uses Jelly extensively in the implementation of its XML Open Gateway application architecture. The Clarity language is known as GEL (Generic Execution Language) and is a scripting language that is based on the Jelly libraries.

The following example shows how Clarity implements the classical "Hello World" application.

  

    Hello World ${i}!

  

External links

• Apache Jelly
• Apache Commons Homepage