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The above process is repeated until all objected that can be transitively reached from GC roots are visited and marked as “in use”.

One object can reference another in different ways in Java, most commonly being when object A is stored in a field of object B.

Any object referenced from those GC roots are assumed to be in use and not discarded.

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They are, for example, currently executing method’s local variables and input parameters, application threads, references from native code and similar “global” objects. These are called GC roots and are (almost) never discarded.

There are some objects which are considered “important” by GC.

How can GC distinguish between the unused objects and the ones the application will use at some point in time in the future? The basic algorithm can be described as follows: Here I would like to stress one very important point: the notion of “object is not used by the application any more” is totally, absolutely, 100% application-specific! Apart from some specific cases, where the lifespan of the object can be logically determined (such as the local variable of the method, which does not under any circumstances escape the method), object usage can be understood only by the application developer taking into account all usage patterns of the application. As a result, these objects remain in memory indefinitely, reducing the amount of memory available to the application. Simplifying a bit, we can say that a memory leak in Java is a situation where some objects are not used by the application any more, but GC fails to recognize them as unused. Java’s automatic memory management relies on GC which periodically looks for unused objects and removes them. This process is called garbage collection and the corresponding piece of JVM is called a Garbage Collector or GC. Unused objects can be discarded and memory reclaimed and reused again. During the life of the application JVM periodically checks which objects in memory are still being used and which are not. new Integer(5), he doesn’t have to allocate memory – this is being taken care of by the Java Virtual Machine (JVM). In Java, when a developer wants to create and use a new object using, e.g. the code freeing the memory has to be written by the developer. After the application finishes using that value, the region of the memory must be manually freed, i.e. When a C-programmer wants to use a variable, he has to manually allocate a region in the memory where the value will reside. Let us start by outlining the difference between memory management in Java and, for example, C languages.

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Looking for an easy solution to a Java memory leak? Plumbr automatically detects the leak and tells you how to solve it. In this post I will explain why memory leaks are in fact a common problem for Java applications. But when we add Java into the equation, the initial excitement is often complemented with questions: “Are there memory leaks in Java? Isn’t Java a garbage-collected language?” When we talk to people about our solution for discovering memory leaks we immediately get positive feedback.