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At first sight, garbage collection should be dealing with what the name suggests – finding and throwing awaythe garbage. In reality it is doing exactly the opposite. Garbage Collection is tracking down all the objects thatare still used, and marks the rest as garbage. Bearing this in mind, we start digging into more details of how theprocess of automated memory reclamation called ‘Garbage Collection’ is implemented for Java Virtual Machine.Instead of rushing into specifics, we shall start from the very beginning, explaining the general nature of garbagecollection and the core concepts and approaches.Disclaimer: This handbook focuses on Oracle Hotspot and OpenJDK behavior. In other runtimes or even onother JVMs, such as jRockit or IBM J9, some of the aspects covered in this handbook can behave differently.
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