Error When Starting the Axis2 Server - Error: Could not find or load main class samples.util.SampleAxis2Server

The following error shows up sometimes when starting Axis2 Server.

Error: Could not find or load main class samples.util.SampleAxis2Server

One possible reason for this is permission issues. In-order to overcome this you can start the Axis2 server in the following manner.

                  sudo sh axis2server.sh                           

Or you can login as Super user and start the Axis Server.