Memory leaks :
objects are no longer being used by the application, but the Garbage Collector is unable to remove them from working memory
Java does automatic Garbage collection. However there can be situations where garbage collector does not collect objects because there are references to them. There might be situations where where an application creates lots of objects and does not use them. Just because every objects has valid references, garbage collector in Java can’t destroys the objects. Such types of useless objects are called as Memory leaks. If allocated memory goes beyond limit, program will be terminated by rising OutOfMemoryError. Hence if an object is no longer required, it is highly recommended to make that object eligible for garbage collector.