Retrieve value of key when key is declared on java class

I am using spring web flow 2.5.0 along with thymeleaf 3.0.9.

I have a class containing some static keys ex:

public class MyKeys{
 .....
 public static final String myKey = "myKey1"
 .....  
}

Somewhere in my controller I store a value for that key in order to be available in the template file.

(pseudo-code):

context.add(MyKeys.mykey,"screen.home.welcome");

screen.home.welcome is an i18n message key(store on application's message.properties) whose value I want to present to the user.

This works but I want to use the key from MyKeys class to access its value.

<div th:utext="#{${myKey1}}"></div>

What I have tried and is not working:

<div th:utext="#{${T(com.package.MyKeys).myKey}}"></div>

With this what I get in the template is myKey1. How I can instruct thymeleaf to retrieve the value which is associated to myKey1?

Solution

That level of indirection you want is a little weird... the reason this doesn't work:

<div th:utext="#{${T(com.package.MyKeys).myKey}}"></div>
// Resolves to
<div th:utext="#{myKey1}"></div>
// Which isn't the actual message key since it's supposed to look like this:
<div th:utext="#{screen.home.welcome}"></div>

I probably wouldn't recommend it, but you could probably use preprocessing for this. Something like this would probably work for you:

<div th:utext="#{${__${T(com.package.MyKeys).myKey}__}}"></div>
// Resolves to
<div th:utext="#{${myKey1}}"></div>
// Resolves to
<div th:utext="#{screen.home.welcome}"></div>

This would probably work as well:

<div th:utext="#{${#root.get(T(com.package.MyKeys).myKey)}}"></div>