Out of boredom and a school project, I started writing a messenger. The following things were important to me:

• a good-looking JavaFX frontend to learn something about the lib
• a pleasant user experience
• security (password hashing and RSA + AES for messages)
• a good grade

Download and run the server jar using java -jar KMesReworkClient_stable-x.y.z.jar PortOnWhichTheServerRuns &.

Running a client is equaly simple. If you want to use the default server just run the client jar. If you want to use a different self-hosted server define port and ip in ClientBackend.

All database location are os dependent.
Linux: ~/KMes/kmes_server.db && ~/KMes/kmes_client.db
Windows: ~\AppData\Roaming\kmes_server.db && ~\AppData\Roaming\kmes_server.db
MacOS: ~/Library/Application Support/kmes_server.db && ~/Library/Application Support/kmes_server.db

Note: the default server ip in ClientBackend is defined as 134.122.74.216 and the default port is 4242.