How to deal with ^ C in JVM console applications?

Question

When the JVM ran (actually written in Scala, but I am inclined to believe that the solution will be almost the same as for Groovy, Clojure or pure Java), my console program ends with the Ctrl+ button C(or the system shutdown sequence, I don’t know is there any difference for the program), how can I make sure that external resources change by the application (databases, files, abstracted web service resources) remain in a predictable, not logically damaged state?

Answer 1

Take a look at Runtime.addShutdownHook .

Usually you use it like this:

Runtime.addShutdownHook(new Thread() {
    public void run() {
        // do your clean up here.
    }
});

Answer 2

, :

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Answer 3

You can capture this signal and close resources. Most services do not need to be closed gracefully, however the files you write usually do.

Perhaps just adding a shutdown hook is all you need. But I would experience this for your situation.