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How do I set a global resource bundle?

In webwork.properties(as of Webwork 2.1.1),
you can now use:

webwork.custom.i18n.resources=global-messages

Serveral resource bundles can be specified by comma separating them.
for example see webwork.properties : http://wiki.opensymphony.com/display/WW/webwork.properties^{Image Removed}

Java class (thanks Drew McAuliffe):

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public class WebworkGlobalMessagesListener implements ServletContextListener {
    private static Logger log = Logger.getLogger(WebworkGlobalMessagesListener.class);
    private static final String DEFAULT_RESOURCE = "global-messages";

    /**
     * Uses the LocalizedTextUtil to load messages from the global
     message bundle.
     * @see
     javax.servlet.ServletContextListener#contextInitialized(javax.servlet.Servle
     tContextEvent)
     */
    public void contextInitialized(ServletContextEvent arg0) {
        log.info("Loading global messages from " + DEFAULT_RESOURCE);
        LocalizedTextUtil.addDefaultResourceBundle(DEFAULT_RESOURCE);
        log.info("Global messages loaded.");
    }

    /**
     * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
     */
    public void contextDestroyed(ServletContextEvent arg0) {

        // do nothing
    }

}

web.xml:
(under listeners section)

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<listener>
<listener-class>mypackagename.WebworkGlobalMessagesListener</listener-class>
</listener> 

How do I change the error message for invalid inputted fields?
You need to create a message for that field, for example if you have a user.dob field you would use this in your messages file (see above for example on setting a global messages file):
invalid.fieldvalue.user.dob=Please enter Date of Birth in the correct format.

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