I am getting “java.lang.ClassNotFoundException: com.google.gson.Gson” error even though it is defined in my classpath

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In case of a JSP/Servlet webapplication, you just need to drop 3rd party JAR files in /WEB-INF/lib folder. If the project is a Dynamic Web Project, then Eclipse will automatically take care about setting the buildpath right as well. You do not need to fiddle with Eclipse buildpath. Don’t forget to undo it all.

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