In Java is there any way to share memory location to exchange some real-time small packets?

Is there any better/smarter way to put and get a boolean value from memory system, but not using any TCP/UDP nor local file system method?

For example:

#both running as 1 application separately

$ java -cp /var/tmp/J.jar System.Backend

$ java -cp /var/tmp/J.jar System.Frontend

Where Backend does memory allocation, and Frontend reads it on the fly, none of them will be able to use TCP/UDP nor File system.

Answer

AFAIK, The only way to use shared memory in pure Java is to use memory mapped files.

If you want two pieces of code to share memory, the simplest thing to do is to use one JVM. There is rarely a good reason to use more than one JVM with tightly couple code.