CHAPTER 12: Execution

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12.9 Virtual Machine Exit

A Java Virtual Machine terminates all its activity and exits when one of two things happens:

• All the threads that are not daemon threads (S20.20.24) terminate.
• Some thread invokes the exit method (S20.16.2) of class Runtime or class System and the exit operation is not forbidden by the security manager (S20.17.13).

A Java program can specify that the finalizers of all objects that have finalizers, and all classes that have class finalizers, that have not yet been automatically invoked are to be run before the virtual machine exits. This is done by invoking the method runFinalizersOnExit of class System with the argument true . The default is to not run finalizers on exit, and this behavior may be restored by invoking runFinalizersOnExit with the argument false . An invocation of the runFinalizersOnExit method is permitted only if the caller is allowed to exit , and is otherwise rejected by the SecurityManager (S20.17).