Can't diagnose build error, no logs

I have a dead simple java program and IntelliJ fails to build it. I'm just using IntelliJ's built-in build system. The IDE Messages: Build frame just prints:

Information:2/28/20, 9:36 AM - Build completed with 1 error and 0 warnings in 10 ms
Error:Address already in use

The error makes no sense to me, this is just some plain vanilla pure Java code:

import java.util.Arrays;

public class Test {

    static String[] sortTest = new String[] { "x", "x_1", "x_100", "x_2", "x_2000" };

    public static void main(String[] args) {
        Arrays.sort(sortTest);
        System.out.println("Sorted: " + Arrays.toString(sortTest));
    }

}

I clicked on show build logs and the directory named build-log doesn't have any files in it that have been touched today. I grepped the entire system/log directory and never found "address already in use".

How can I diagnose this issue. It seems IntelliJ is just throwing logs away.

I quit the IDE and started it again, and the issue persists.