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https://issues.apache.org/jira/browse/CLK-306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207130#comment-13207130
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Gilberto C Andrade commented on CLK-306:
----------------------------------------
Digging a little in the issue, I've found the class[1] that make MVEL complain
about permission as you can see in the log:
<quote>
[junit] at
org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:906)
[junit] Caused by: [Error: could not access property (bool) in:
java.lang.String]
[junit] [Near : {... bool ....}]
[junit] ^
[junit] [Line: 1, Column: 1]
[junit] at
org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeSetAccessor(ReflectiveAccessorOptimizer.java:312)
[junit] at
org.mvel2.optimizers.dynamic.DynamicOptimizer.optimizeSetAccessor(DynamicOptimizer.java:78)
[junit] at
org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:54)
[junit] at
org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:91)
[junit] at
org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)
[junit] at org.mvel2.MVEL.executeExpression(MVEL.java:969)
</quote>
If you change the access modifier of all fields(in the RequestBindingPage.java
class) from private to public the test will pass.
Thanks and good work,
Gilberto
[1]
http://svn.apache.org/viewvc/click/trunk/click/framework/test/org/apache/click/pages/RequestBindingPage.java?revision=991908&view=markup
> 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");
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