[jsr-314-open] [C036-ElInResources] ACTION: Vote: Resource.getInputStream() underspecified (was: Evaluating EL in resource files)

[Ed Burns]

>>>>> On Fri, 25 Sep 2009 08:55:11 +0200, Werner Punz <werner.punz at gmail.com> said:

WP> Anyway I think this discussion gets a little bit off topic ;-), wasnt it
WP> about how to apply the el to javascripts originally?

Thank you.  Please take the valuable discussion of caching and resources
to a separate thread.

>From the previous discussion, I draw two alternatives, which I place on
the table for further debate.  

OPTION RestrictAllowableExpressions

With this option, we modify Resource.getInputStream() to state that the
implementation must evaluate EL Expressions in resource files if and
only if the expression is simple (not compound) and starts with the
"resource" implicit object.  Handling of any other kinds of EL
Expressions requires decorating the ResourceHandler.

OPTION DefaultToOptOut

With this option, we modify Resource.getInputstream() to state that EL
evaluation in Resource files is disabled by default.  For simplicity, I
suggest the user convey their intention at a per-application granularity
using a context-param.  If the user does decide to opt-in, all EL
Expressions in all resources are evaluated every time the resource is
served.  Resource.getInputStream() will include non-normative text
alerting the user to possible scope complications.

I prefer RestrictAllowableExpressions because decorating the
ResourceHandler is an easy way to allow more powerful behavior.

ACTION: Please voice your opinion by 1700 EDT Monday 28 September 2009.

Ed


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