Why changing text in properties file (using ConstantsWithLookup) doesn't make any change in the constants in Production Mode?

Here is my problem. I want to change the Constants dynamically for my web app when it's already in the Production Mode.

So here is what I did

import com.google.gwt.i18n.client.ConstantsWithLookup;  public interface MyConstants extends ConstantsWithLookup{     String email();  }  

In the MyConstants.properties file

email=My email  

Now i compiled the whole project & deploy it into server. At first test in server, it showed correctly "My email", then I went to C:\tomcat\webapps\myApp\WEB-INF\classes\myApp\client\MyConstants.properties & change the text in that file to:

email=Your email  

Now i ran myApp in tomcat but nothing happened. It still uses the My email String rather than Your email string.

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