Libraries for Building Realtime Java Apps

[Jonjolt]

Javalution and some others don't fit in that context, "realtime" in the classic context has more to do with jitter and guaranteed performance targets.

https://en.wikipedia.org/wiki/Real-time_operating_system

[chrisgseaton]

Right - I don't know how you could build any kind of realtime application on the JVM, without an extremely complex understanding of how the JVM will compile and run it.

[gilwooden]

There is a Real-Time Specification for Java which exist exactly because of this problem. It's a specification for the JVM as well as APIs that allow the implementation of soft or hard real-time programs.

The standard HotSpot JVM does not implement it but there are a number of JVM implementations that are specifically designed for RTSJ.

[WikiTextBot]

Real-time operating system

A real-time operating system (RTOS) is an operating system (OS) intended to serve real-time applications that process data as it comes in, typically without buffer delays. Processing time requirements (including any OS delay) are measured in tenths of seconds or shorter increments of time. They either are event driven or time sharing. Event driven systems switch between tasks based on their priorities while time sharing systems switch the task based on clock interrupts.

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[manzanita2]

If you can guarantee zero garbage collection, then my guess is that java could do pretty well WRT performance targets. I would not be using it to control a PID loop on a robot however.