How to Correctly use com.mattbertolini.hermes.Hermes to manage Constants at Server side (GWT)?

Ok, I want to manage Constants at Server level, so com.mattbertolini.hermes.Hermes is a solution.

Please see all my steps:

1- I downloaded hermes-1.2.0.jar & import into correct Library of eclipse (no problem)

2- Create MyConstantsWithLookup.java at client package

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

3- create MyConstantsWithLookup.properties file in the same client package. The file has this line:

myMsg=Deleted  

4- In ServerData.java in Server package

MyConstantsWithLookup my = Hermes.get(MyConstantsWithLookup.class, "");  String  extra=my.myMsg();  

When tested in eclipse it works fine but I got Warnign message in eclipse:

[WARN] Server class 'com.ibm.icu.util.ULocale' could not be found in the web app, but was found on the system classpath     [WARN] Adding classpath entry 'file:/C:/Users/eclipse-jee-juno-SR1-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.5.0.v201212122042-rel-r42/gwt-2.5.0/gwt-dev.jar' to the web app classpath for this session     For additional info see: file:/C:/Users/eclipse-jee-juno-SR1-win32-x86_64/eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.5.0.v201212122042-rel-r42/gwt-2.5.0/doc/helpInfo/webAppClassPath.html    

I am not sure what this warning'd about? is it serious?

The code was running ok but why eclipse generated this warning?

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