BufferedReader with new InputStreamReader(System.in) 抛出异常资源暂时不可用

Question

In my standalone application I have to read the user input from console in different classes. I created a static class member variable in Installer class

public static final BufferedReader buffReader = new BufferedReader(new InputStreamReader(System.in));

but Installer.buffReader.readLine(); throws an IO exception - "Temporarily unavailable resource" sometime

public static void startApplication() {
        System.out.println("Would you like to start the application? [y/n]");
        String userChoice = null;
        try {
            userChoice = Installer.buffReader.readLine();
            if (userChoice != null && userChoice.equalsIgnoreCase("y")) {
                start();
            }
        } catch (IOException ex) {
            LOGGER.error("Exception occured in startApplication() :{}", ex.getMessage());
        }
    }

How can I debug or prevent it?

Answer 1

I think is because you are calling here to the same method:

if (userChoice != null && userChoice.equalsIgnoreCase("y")) {
            startApplication();
        }

so the second time you call the method is throwing you the exception because the bufferedReader is still opened.

Try to close the bufferedReader before with buffReader.close(). Or don't use the static for BufferedReader because if other part of the app is using it, you will have a exception as well.

EDIT:

I was searching a little bit in google and can be because your operative system that is blocking the input for any reason. I tried your code and for me is not failing. Check here is a similar case: Link