Java code inspections not working

I wrote this class, turned on Resource Management -> AutoCloseable used without 'try'-with-resources with a default Warning severity, and I was expecting a warning that I am not getting.

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;

public class InspectionTest {

    public void leakMemory() throws IOException {
        URLConnection conn
                = new URL("http://norvig.com/big.txt").openConnection();
        BufferedReader br = new BufferedReader(
                new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
    }

    public static void main(String[] args) throws IOException {
        System.out.println("Hello world");
        new InspectionTest().leakMemory();
    }

}