How-to: Include Third-Party Libraries in Your MapReduce Job - Cloudera Blog“My library is in the classpath but I still get a Class Not Found exception in a MapReduce job” – If you have this problem this blog is for you. Java requires third-party and user-defined classes to be on the command line’s “–classpath” option when the JVM is launched. The `hadoop` wrapper shell script does exactly this for you by building the classpath from the core libraries located in /usr/lib/
