Help with Java Memory Leak in URLConnection

Question

Hi everyone,
I can't seem to find the memory leak in the below code, if anyone could help, i would greatly appreciate it. The jist of the code is: I open up a URLConnection to update a ColdFusion page that takes in URL parameters passed in my URL. Then, I get the response. I also check for proxy usage and take that into consideration when making the connection.
I have one class to handle the Connections, Connect.java:
     * Connection using Username and Password, as well as boolean option to use Basic Proxy Authentication
     public Connect(String pHost, String pPort, String urlString,
                         String pUsername, String pPassword, boolean useProxy) {
          this.pHost = pHost;
          this.pPort = pPort;
          this.urlString = urlString;
          this.pUsername = pUsername;
          this.pPassword = pPassword;
          this.useProxy = useProxy;
     * Get the Input Stream from the Connection given a specific URL
     public java.io.InputStream getInputStream(String urlString) {
          if (urlString == null) urlString = this.urlString;
             exDialog = new ExceptionDialog(new javax.swing.JFrame());
          try {
               String auth = "";
               if (useProxy) {
                    System.getProperties().put("proxySet", "true");
                    System.getProperties().put("proxyHost", pHost);
                    System.getProperties().put("proxyPort", pPort);
                    String authString = "";
                    if (pUsername != null && pUsername != "") authString = pUsername + ":";
                    else authString = "username:";
                    if (pPassword != null && pPassword != "") authString = authString + pPassword;
                    else authString = authString + "password";
                    auth = "Basic " + new sun.misc.BASE64Encoder().encode(authString.getBytes());
               java.net.URL url = new java.net.URL(urlString);
               java.net.HttpURLConnection conn = (java.net.HttpURLConnection)url.openConnection();
               if (useProxy) conn.setRequestProperty("Proxy-Authorization", auth);
               conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.0)");
               conn.setDoInput( true );
               conn.setDoOutput( true );
               conn.connect();
               return conn.getInputStream();
          } catch (java.io.IOException ioe) {
               exDialog.showForThrowable(ioe.toString(),ioe);
               return null;
     }I call the code in Download.java:
Connect conn = new Connect(sm.pHost, sm.pPort, null, sm.pUser, sm.pPass, sm.useProxy);
new BufferedReader(new InputStreamReader(conn.getInputStream(sUpdateURL)));
in.close();For some reason, as I loop through this call, the memory footprint of my program grows through every iteration, eventually resulting in a Java Out of Memory error. I can't track the leak down and it's fairly frustrating. If anyone can help, that would be greatly appreciated. Thanks!

Answer 1

One place there might be a memory leak is in the line
exDialog = new ExceptionDialog(new javax.swing.JFrame());Even though the JFrame object goes out of scope when the ExceptionDialog method returns, JFrames stay around until they are closed, even though in this case it isn't even shown on the screen.