The Java Unified Expression Language is a special purpose programming language mostly used in Java web applications for embedding expressions into web pages. The Java specification writers and expert groups of the Java web-tier technologies have worked on a unified expression language which is now part of the JSP 2.1 specification (JSR-245). While the expression language is part of the JSP specification, it does not depend on the JSP specification and therefore it is available for a variety of technologies.
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