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Date: Wed, 3 May 2006 18:36:47 +0000 (GMT+00:00)
From: "Eddie O'Neil (JIRA)" <dev@beehive.apache.org>
To: dev@beehive.apache.org
Subject: [jira] Commented: (BEEHIVE-1070) bindingUpdateErrors
 expression="${aValue}" always returns tag error
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    [ http://issues.apache.org/jira/browse/BEEHIVE-1070?page=comments#action_12377608 ] 

Eddie O'Neil commented on BEEHIVE-1070:
---------------------------------------

Krista -- after looking at this, I think that the documentation is incorrect.  This tag's "expression" attribute should resolve to a NetUI expression because it's specified in the tag as:

  <netui:bindingUpdateErrors expression="actionForm.foo"/>

or because the container executes a JSP 2.0 expression whose value is a NetUI expression:

  <% pageContext.setAttribute("theexpression", "actionForm.foo");%>
  <netui:bindingUpdateErrors expression="${theexpression}"/>

The exception is caused because the "expression" attribute requires a value.  Iroincally, I think that the real bug is that the <bindingUpdateErrors> tag should have runtime expressions disabled.  I'll make both of these changes -- disabling runtime expressions and the documentation fix.

> bindingUpdateErrors expression="${aValue}" always returns tag error
> -------------------------------------------------------------------
>
>          Key: BEEHIVE-1070
>          URL: http://issues.apache.org/jira/browse/BEEHIVE-1070
>      Project: Beehive
>         Type: Bug

>   Components: NetUI
>     Versions: 1.0.1
>     Reporter: Krista Baker
>      Fix For: v.next

>
> As listed in the JSP tag documentation, the following tag will always produce a tag error 
> <netui:bindingUpdateErrors expression="${actionForm.firstName}"/>
> with a message of: Attribute 'expression' is required to have a value. The value "" is illegal. This is often caused by binding to an object with a null value.
> If the above expression="${actionForm.firstName}" is changed to "actionForm.firstName", the expected behavior will be observed.
> The netui test of coretags/binding/nullbinding is an example of this where the error is seen only because the expression="${ }".  
> From this index.jsp:
>   <li><netui:bindingUpdateErrors expression="${pageFlow.nullValue}" /> -- Binding Errors</li>
> Even though the value remains null, if the expression is changed to the following, 
>   <li><netui:bindingUpdateErrors expression="pageFlow.nullValue" /> -- Binding Errors</li>
> the error will not occur even though the pageFlow value is still null.
> There are three netui testRecorder tests that use this element and attribute combination:
> coretags/binding/nullbinding - uses expression="${}"
> coretags/binding/report - uses expression=""
> tags/bindingUpdateErrors - uses expression=""
> I am not sure if the example in the docs (http://beehive.apache.org/docs/1.0.1/netui/apidocs/taglib/beehive.apache.org/netui/tags-html-1.0/bindingUpdateErrors.html) and the nullbinding test are incorrect or if it is the other way around that the other two tests, even though currently producing expected results, are wrong.

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