[
https://issues.apache.org/jira/browse/CLK-306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150260#comment-13150260
]
Andrew Fink commented on CLK-306:
---------------------------------
+100
Also MVEL template engine can be used for internal/components templates, so
velocity (and many it's dependencies) can be removed from distribution.
> Replacing OGNL with MVEL
> ------------------------
>
> Key: CLK-306
> URL: https://issues.apache.org/jira/browse/CLK-306
> Project: Click
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.4
> Environment: Target Click 1.5
> Reporter: Bob Schellink
> Assignee: Bob Schellink
> Fix For: 2.3.1
>
> Attachments: expression-language-performance.rar,
> expression-language-performance.zip
>
>
> I have been following both OGNL and MVEL (another expression language)
> development the last couple of months. If we are going to make changes to
> this here are some things you might find interesting:
> * OGNL 2.7.1 which is included in tapestry 4.1, now sports byte code
> enhancement. This was added by one of the tapestry authors to make OGNL much
> faster than its reflection mode. However in my testing 2.7.1 threw exceptions
> every now and then. So still buggy.
> * MVEL (http://mvel.codehaus.org/) seems like a good replacement for OGNL. It
> has good docs and is actively developed. They even fixed a bug I logged! Like
> OGNL, MVEL also runs in two modes, either reflection or byte compiled. Unlike
> OGNL, MVEL's reflection mode is faster than Click's reflection mode.
> I am no expert on this but according to the article below (from MVEL's
> author), byte code enhancement have some problems in that generated classes
> accumulate in java's perm space and will only be removed when their
> classloader is removed.
> http://artexpressive.blogspot.com/2007/07/mvel-by-numbers-real-story.html
> So MVEL in reflection mode looks like an ideal solution here. The power of
> OGNL with the performance of Click reflection.
> Table columns can again take advantage of expressions. For example to
> aggregate a total for the row -> new Column("price * tax");
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
