CODEWITHSUNDEEP
javajspstruts2
Daniel Morgan
Daniel Morgan

Reputation: 772

How to access a java interface from jsp

I am trying to access to an interface of constants from my jsp but it shows the following error.

Caused by: tag 'select', field 'list', name 'title': 
The requested list key 'Constants.TITLE' 
could not be resolved as a collection/array/map/enumeration/iterator type. 
Example: people or people.{name} - [unknown location]

My interface

public interface Constants {
    public List<String> TITLE = Arrays.asList("Mr","Mrs","Ms","Miss"); 
    // public String[] TITLE = {"MR","MRs"}; << does not work as well
   //public static final String[] TITLE = {"MR","MRs"}; << does not work as well
}

My Jsp Code

...
<%@page import="com.myconstants.Constants" %>
<head>
</head>
<body>
     <s:form>
     <s:select label="title" name="title" list="Constants.TITLE" value=" "/>
     </s:form>
 ....

Upvotes: 1

Views: 1624

Answers (1)

Dave Newton
Dave Newton

Reputation: 160321

Make a class. Put the list in a class. Use normal OGNL static property access:

<s:select key="title" list="@some.package.Constants@TITLES" />

Would I do it like this? Probably not; harder to I18Nize, harder to find/refactor usages in JSP (depends on IDE). In general I'd recommend exposing data to the view layer via a service/layer in actions.

Upvotes: 2

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