Shutdown Hook

Sometimes it is necessary to perform some cleanup before your java application shuts down. But problem is user may not always exit properly. User may terminate by pressing Ctrl + C or may simply logoff or shutdown the Operating system while application is still running.

How to ensure that cleanup code executes in such scenario?

Well! Java provides an elegant way to execute cleanup code in the middle of shutdown process. We will discuss it in this article.

Let’s start by understanding what happens when JVM (Java Virtual Machine) shuts down!