Exception clearly says that you don't have a application_en.properties
or at least application.properties
file in the resources
package in the runtime classpath.
That's really it. Just make sure you have one.
Unrelated to the concrete problem, I just want to warn that <message-bundle>
and <f:loadBundle>
are mutually exclusive. To learn about the difference, head to Internationalization in JSF, when to use message-bundle and resource-bundle?