The UDP transport implementation is in the Apache WS-Commons Transports project. The following classes implement the Axis2 transport listener and sender APIs respectively.
The axis2-transport-udp.jar archive file contains the above implementation classes.
To enable the UDP transport for samples, simple open the file repository/conf/axis2.xml in a text editor and add the following transport configurations. UDP transport component is shipped with the WSO2 ESB by default.
If you wish to use the sample Axis2 client to send UDP messages, you have to uncomment the UDP transport sender configuration in the samples/axis2Client/client_repo/conf/axis2.xml file.