Vendor agnostic way to determine you have a proxy.

Question

In the Java Persistence API is there a vendor agnostic way to determine that an object is an unitialized proxy? The only thing that seems to be consistent is that trying to access a property on the proxy will throw an exception. Can I determine ahead of time that an exception would be thrown?
Thanks much.

Answer 1

You might catch the Exception and have a look at it what it says. Maybe the proxy server is not the reason for the problem. Perhaps Yahoo does not like to be accessed in the way your application does.
import java.net.*;
import java.io.*;
public class URLReader {
    public static void main(String[] args) {
        URL yahoo = new URL("http://www.yahoo.com/");
        BufferedReader in = null;
        try {
            in = new BufferedReader(new InputStreamReader
                                   (yahoo.openStream()) );
            String inputLine;
            while ((inputLine = in.readLine()) != null) {
                System.out.println(inputLine);
        } catch (Exception e) {
            System.out.println(e.getMessage());
        } finally {
            in.close();