Referential Integrity in RMI:

If two references to an object are passed from one JVM to another JVM in parameters (or in the return value) in a single remote method call and those references refer to the same object in the sending JVM, those references will refer to a single copy of the object in the receiving JVM.

To test:

sbt clean compile test

To run Server:

sbt clean compile "runMain Server" or sbt clean compile run (select Server i.e option 2)

To run Client:

sbt "runMain Client" or sbt run (select Client i.e option 1)