IntelliJ: Why java.net.InetAddress is deprecated Class?

Question

I've got a some problem. My program cant't run, throws: nullPointException. On other IDE it's running.

One day ago I just click something, I don't know what that was :( Now this is look like this:

InetAddress localHost = Inet4Address.getLocalHost();

But InetAddress is strike throuh.

Please help, how can I undo this.

Answer 1

This method is not deprecated in the version up to Java 9

https://docs.oracle.com/javase/9/docs/api/java/net/InetAddress.html#getLocalHost--

I have seen this fail on mis-configured machines. e.g. you have an invalid hosts file, though it shouldn't ever throw a NullPointerException AFAIK.

What I do is catch UnknownHostException and use "localhost" instead if this fails.

https://github.com/OpenHFT/Chronicle-Core/blob/master/src/main/java/net/openhft/chronicle/core/OS.java#L133

private static String getHostName0() {
    try {
        return InetAddress.getLocalHost().getHostName();
    } catch (UnknownHostException e) {
        return "localhost";
    }
}