Submitting a Map/Reduce job from inside JBoss Fuse fails with a ClassNotFoundException for my Mapper class?

Issue

When submitting a map/reduce job inside of JBoss Fuse, the job fails due to the following exception:

JBossFuse:karaf@esb1> java.lang.RuntimeException: java.lang.ClassNotFoundException: com.redhat.support.MyMapper
    at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:849)
    at org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:199)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:719)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
    at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
    at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.ClassNotFoundException: gov.dot.faa.enroute.fdps.subscriptions.MyMapper
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:249)
    at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:802)
    at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:847)
    ... 8 more