This isn't in the UI layer. This is in a controller. At any rate there is a simple work around, but this sure doesn't seem like it should be generating an error. If a property doesn't exist on an object it sure seems like the test for empty=true should work, and not throw a runtime error.

At any rate there are easy workarounds in this case but workarounds make the code uglier.


Aaron


On 5/7/2010 3:57 PM, Jon Stevens wrote:
I don't know if there is a way and it isn't something I'd depend on in the UI layer. Think of [class] like you'd think of an interface. You really should only put implementations of interfaces into the context. Otherwise, I'd consider putting a Map in there for the effect you want.

jon

On Fri, May 7, 2010 at 1:43 PM, Aaron Freeman <aaron.free...@layerz.com <mailto:aaron.free...@layerz.com>> wrote:

    Bummer, what's the proper way to test if a property exists then,
    since ${!empty [class].[property]} isn't the correct way?

    Thanks,

    Aaron



    On 5/7/2010 3:07 PM, Jon Stevens wrote:
    That is what JBoss does, so I'd say that Caucho fixed a bug.

    jon

    On Fri, May 7, 2010 at 12:59 PM, Aaron Freeman
    <aaron.free...@layerz.com <mailto:aaron.free...@layerz.com>> wrote:

        We are system testing Resin 4.0.6 with our old code base and
        found a
        curiosity.  The following code used to work, regardless of
        what "type"
        "receipt" is:

        <c:if test="${!empty receipt.details}">

        Under Resin 3.0.x if receipt was a HashMap and had a
        "details" property
        then it would return "true".  If it was a HashMap and did not
        have a
        details property, it would correctly return false.  And (most
        importantly), if receipt was _any_ other class, including
        built in java
        classes, it would just return false.  With Resin 4.0.6 it now
        throws an
        error:

        'details' is an unknown bean property of 'java.math.BigDecimal'

        That's not the expected behavior is it?

        Thanks,

        Aaron



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