I failed to include the reproducer, which is: import java.net.*;
public class Test { public static void main(String[] args) { for (int i = 0; i < 500; i++) { new Thread(() -> { try { URL url = new URL(args[0]); var huc = url.openConnection(); huc.getInputStream().readAllBytes(); } catch (Exception e) { e.printStackTrace(); } }).start(); } System.out.print("."); } }