ravi_eze wrote:
hi,
even this doesnt seem to be working.
is it possible to load the constant class to the context and then display it
form there.? or in that case it expects a setters and getters... or some way
of getting this done.. the code is very bad to read 'cos every time i am
using @com.company....
any help???
cheers,
ravi
I have a solution, but first...
OGNL only provides access to static fields and static methods. It
cannot reference a static class, nor even an inner static class.
http://www.ognl.org/2.6.9/Documentation/html/LanguageGuide/apa.html
It's terrible that struts2 provides no feedback all for all those
invalid ONGL expressions. It only provides feedback for valid
expressions referencing invalid properties.
<s:set value="@com.blueskyminds.web.test.Constants" var="C"/>
008-05-02 00:36:18,747 WARN [http-8080-Processor23] [OgnlValueStack]
Could not find property [EMAIL PROTECTED]
<s:set value="@[EMAIL PROTECTED]" var="I"/>
008-05-02 00:36:18,747 WARN [http-8080-Processor23] [OgnlValueStack]
Could not find property [EMAIL PROTECTED]@InnerClass]
However, there is a bearable solution / hack:
1. In your Constants class, create a public static singleton instance of
itself. Lets call it C. (Remember, OGNL can reference static fields)
public static final Constants C = new Constants();
2. In your Constants class, create a static getter for each constant.
Thank goodness for the IDE's auto-generation of getters.
public static final String TEST_CONSTANT1 = "test1";
public static String getTEST_CONSTANT1() {
return TEST_CONSTANT1;
}
3. Get get static field C and put it into scope
<s:set value="@[EMAIL PROTECTED]" var="C"/>
4. Access its properties using dot notation.
<s:property value="#C.TEST_CONSTANT1"/>
Note: You can't access the static fields of an instance, so you can't
use [EMAIL PROTECTED] It likes a static property.
Tested in Struts 2.1.1 with OGNL 2.6.11. Dumb.
To summarize:
package com.blueskyminds.web.test;
public class Constants {
public static final String TEST_CONSTANT1 = "test1";
// hack for OGNL follows:
public static final Constants C = new Constants();
public static String getTEST_CONSTANT1() {
return TEST_CONSTANT1;
}
}
In the JSP:
<s:set value="@[EMAIL PROTECTED]" var="C"/>
<s:property value="#C.TEST_CONSTANT1"/>
*Note: this is code for 2.1. In 2.0, the s:set tag uses the id
attribute instead of var (I think).
*Note again: <s:property value="[EMAIL PROTECTED]"/> does not work. OGNL
won't find a static field of an instance.
regards,
Jeromy Evans
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
