Same issue I faced,....but then realized that the message resource file name should be mentioned in the web.xml with out the extension.
So, for example,
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>com........AppControllerServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>application</param-name>
<param-value>AppErrorMessages</param-value>
</init-param>
Here, "AppErrorMessages" should not be mentioned as "AppErrorMessages.properties".
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