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From Jeanfrancois Arcand <jeanfrancois.arc...@sun.com>
Subject Re: [PROPOSAL] EL Transition to Jakarta Commons
Date Wed, 18 Dec 2002 19:23:49 GMT
+1

-- Jeanfrancois

Jan Luehe wrote:

>I'd like to resume discussion on a proposal circulated by James
>Strachan on March 13, 2002, about turning the implementation of JSTL's
>expression language (EL) into a reusable component and moving it from
>the Standard Taglib, an implementation of JSTL hosted by
>jakarta-taglibs, to jakarta-commons, in order to make it available to
>a larger number of projects.
>
>James' original proposal received some positive feedback from the
>taglibs-dev community. Below is a draft proposal for a formal
>submission to jakarta-commons, following the format of the
>jakarta-commons charter at http://jakarta.apache.org/commons/charter.html.
>
>(0) Rationale
>
>The JSP Standard Tag Library (JSTL), version 1.0, introduced the
>concept of an Expression Language (EL), whose main goal is to provide
>page authors with an easy way to access and manipulate application
>data without requiring the use of scriptlets
>
>JSP 2.0 adopted the EL specification from JSTL, and expanded its
>scope: EL expressions are no longer limited to JSTL action attributes,
>but may be used in any standard or custom action attribute declared to
>accept a runtime expression. In addition, EL expressions may now also
>be used directly in template text outside of any actions. JSP 2.0 also
>added an important feature to the EL specification: EL functions,
>which allow page authors to invoke static methods in Java classes from
>EL expressions. Additionally, JSP 2.0 allows programmatic access and
>customization of the EL evaluator through a set of standard interfaces
>and abstract classes.
>
>Currently, there are a number of projects (including Tomcat 5 and Java
>Server Faces) that leverage the EL implementation of the Standard
>Taglib. In addition, there seems to be interest in leveraging the EL
>in the context of scripting workflow activities using custom tag
>libraries.
>
>In order to make the EL implementation available to Tomcat 5, the
>Tomcat team defined a new "ant" target for the Standard Taglib that
>builds just the EL portion and packages it in a JAR file
>("jsp20el.jar") which is stored in Tomcat's common/lib directory. This
>approach has always been considered an interim solution only, until
>the EL implementation would move from the Standard Taglib to a more
>visible location such as jakarta-commons.
>
>(1) Scope of the package
>
>The package shall provide an implementation of the Expression Language
>specification which is part of the JSP 2.0 standard.
>
>(1.5) Interaction with other packages
>
>The package shall provide an implementation of the standard interfaces
>and abstract classes of the javax.servlet.jsp.el package, which is
>defined in the JSP 2.0 specification.
>
>(2) Identify the initial source for the package
>
>The initial codebase will be taken from the Standard Taglib project
>hosted at jakarta-taglibs. The source of the Standard Taglib is
>available as part of the jakarta-taglibs nightly source distribution
>at http://jakarta.apache.org/builds/jakarta-taglibs/nightly/src/
>
>(2.1) Identify the base name for the package
>
>The base name of the package shall be org.apache.commons.el
>
>(2.2) Identify the coding conventions for this package
>
>The package follows Sun's Java coding conventions (see
>http://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html).
>
>(3) Identify any Jakarta-Commons resources to be created
>
>(3.1) Mailing list
>
>The package shall use the jakarta-commons mailing list.
>
>(3.2) CVS repositories
>
>The package shall use a root branch of the jakarta-commons CVS.
>
>(3.3) Bugzilla
>
>The package shall be listed as the "EL" component under the "Commons"
>project in Bugzilla.
>
>(3.4) Jyve FAQ (when available)
>
>n/a
>
>(4) Identify the initial set of committers to be listed in the Status File.
>
>The initial set of committers will be identical to the set of
>committers of the Standard Taglib project.
>
>
>Thoughts?
>
>Jan
>
>
>--
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>
>
>  
>


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