The Java memory model describes how threads in the Java programming language interact through memory. Together with the description of single-threaded execution of code, the memory model provides the semantics of the Java programming language.
The original Java memory model developed in 1995, was widely perceived as broken,[1] preventing many runtime optimizations and not providing strong enough guarantees for code safety. It was updated through the Java Community Process, as Java Specification Request 133 (JSR-133), which took effect back in 2004, for Tiger (Java 5.0).[2][3]
^Pugh, William (2000). "The Java memory model is fatally flawed" (PDF). Concurrency: Practice and Experience. 12 (6): 445–455. doi:10.1002/1096-9128(200005)12:6<445::AID-CPE484>3.0.CO;2-A. Retrieved 15 July 2021.
^Goetz, Brian (2004-02-24). "Fixing the Java Memory Model, Part 2" (PDF). IBM. Retrieved 2010-10-18.
^Jeremy Manson and Brian Goetz (February 2004). "JSR 133 (Java Memory Model) FAQ". Retrieved 2010-10-18. The Java Memory Model describes what behaviors are legal in multithreaded code, and how threads may interact through memory. It describes the relationship between variables in a program and the low-level details of storing and retrieving them to and from memory or registers in a real computer system. It does this in a way that can be implemented correctly using a wide variety of hardware and a wide variety of compiler optimizations.
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