A DESCRIPTION OF THE PROBLEM :
When setting an empty list for select, connect throws NPE. Maybe internal variable not init correctly.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
using DIRECT for empty lists
ACTUAL -
java.lang.NullPointerException: Cannot invoke "sun.net.www.http.HttpClient.getOutputStream()" because "this.http" is null

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import java.net.*;

public class HttpURLConWithProxy {
    public static void main(String[] args) throws Exception {
        ProxySelector.setDefault(new EmptyProxySelector());
        
        URL url = new URL("http://localhost:80");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.connect();
    }
}

class EmptyProxySelector extends ProxySelector {
    public java.util.List<Proxy> select(URI uri) {
        return java.util.Collections.emptyList();
    }
    
    public void connectFailed(URI uri, java.net.SocketAddress sa, java.io.IOException ioe) {
    }
}
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