Garbage collection happens inside a running JVM. The JVM manages memory through a process called garbage collection, which continuously identifies and eliminates unused memory in Java programs. In Java, program memory is managed by the JVM. The most common adjustment is performance-tuning the JVM's memory settings.īefore Java, all program memory was managed by the programmer. The most common interaction with a running JVM is to check the memory usage in the heap and stack. The OpenJDK project started with Sun Microsystems' decision to open-source Java and has continued through Oracle's stewardship. The JVM is widely deployed, heavily used, and maintained by some very bright programmers, both corporate and open source. All of these are considered JVM languages, meaning that, even though they are not coding in Java, the programmer retains access to the vast ecosystem of Java libraries. Another prominent example is Kotlin, which delivers a blend of object-oriented and functional styles. While it was once only for Java, the JVM is flexible and powerful enough to support many other languages today. Among the most popular are Scala, used for real-time, concurrent applications, and Groovy, a dynamically typed scripting language. Contrast this to the JVM specification, which describes the requirements for building a program that performs those tasks. When developers talk about the JVM, we usually mean the process running on a machine, especially a server, that represents and controls resource usage for a Java application. We configure the settings and then rely on the JVM to manage program resources during execution. Everyday definition: The JVM is how we run our Java programs.Technical definition: The JVM is the specification for a software program that executes code and provides the runtime environment for that code.
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