This tutorial assumes that you have completed Chapter 10, Networking in Java - Client/Server Applications. The client-server application that was discussed in that tutorial worked well, however there was one main difficulty. The Server could only handle one client connection at a time, i.e. A connection is made and the server is locked to that client. The service is performed and then when complete, the client is released and the server is available for more client connections. In this section we want to develop a threaded server that will allow multiple client connections at the same time.