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Catch unhandled exception 
public class ErrorHandler implements Thread.UncaughtExceptionHandler {

    @Override
    public void uncaughtException(Thread t, Throwable e) {
        System.err.printf("Thread ID : %s%n", t.getId());
        System.err.printf("Message : %s%n", e.getMessage());
    }

    public static void main(String[] args) {
        // register handler
        Thread.setDefaultUncaughtExceptionHandler(new ErrorHandler());

        // throw error
        throw new RuntimeException("My exception!");
    }

}

Know the JVM Series – 1 – The Uncaught Exception Handler