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Editorial Team
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Asked: 2026-06-12T20:07:26+00:00

I’m trying to build a hello world application utilising GCM for Android notifications. When

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I’m trying to build a hello world application utilising GCM for Android notifications. When developing the server part, I’m not entirely sure how to get the gcm-server.jar file into the project. I’ve added it to the build path and Eclipse finds it perfectly fine, but when I build and deploy the project to a tomcat server (from within eclipse) it’s throwing the following error at runtime:

java.lang.NoClassDefFoundError: com/google/android/gcm/server/Sender

I’m assuming I’m doing something wrong when importing the jar. What exactly is the procedure for getting a jar into a dynamic web project using Eclipse?

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  1. Editorial Team

    Going to answer my own question because I just got it working.

    Turns out adding the .jar’s to the Java build path is not enough. Tomcat has a seperate classpath for each project, and won’t see the classes in the jar unless you dump the jar files into the WEB-INF/lib folder (which Eclipse does not do automatically).

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