Steps:
1. Create separate resource bundles for each modules. Name them accordingly as per conventions and place them in the classpath folder.
2. Add following in the Struts-Config.xml file:
message-resources key="applicationResource_1" parameter="com/package/ApplicationResource"/>
3. Now, in a jsp to view the labels and message, you can sue the following tag:
< bundle="applicationResource_1" key="label.1">
Cheers,
-Ibu