Any object in Java can be used as a lock using a synchronized block. This will also automatically take care of releasing the lock when an exception occurs. Object someObject = …; synchronized (someObject) { … } You can read more about this here: Intrinsic Locks and Synchronization
Multiple options for IPC: Socket-Based (Bare-Bones) Networking not necessarily hard, but: might be verbose for not much, might offer more surface for bugs, as you write more code. you could rely on existing frameworks, like Netty RMI Technically, that’s also network communication, but that’s transparent for you. Fully-fledged Message Passing Architectures usually built on either … Read more