IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator > The collector and the allocator

Garbage collection

When the JVM cannot allocate an object from the heap because of lack of contiguous space, a memory allocation fault occurs, and the Garbage Collector is called.

The first task of the Garbage Collector is to collect all the garbage that is in the heap. This process starts when any thread calls the Garbage Collector either indirectly as a result of allocation failure, or directly by a specific call to System.gc(). The first step is to acquire exclusive control on the virtual machine to prevent any further Java™ operations. Garbage collection can then begin.

Parent: The collector and the allocator

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