First, build the project
./gradlew clean build
And then start the server in port 5000
java -cp build/libs/Echo-server-0.1.0.jar Server/EchoServer 5000
java -cp build/libs/Echo-server-0.1.0.jar Client/EchoClient 5000
Start netcat and connect to localhost on port 9090
netcat localhost 5000
Right after, type your the name of the client or your name
netcat