If the common project also contains server side code, then you have to copy these server side classes to your .war file. So your build.xml file should include app-project/war/WEB-INF/classes AND common-project/bin (or common-project/war/WEB-INF/classes depending on your project setup) when building the war file. Otherwise your common server classes will be missing in the war file as Eclipse compiles the project's source to the classes folder of the corresponding project.
If you see a NoClassDefFoundException then you are missing server classes and you should fix your build.xml.
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