URL class heavy on COU usage

From: jmm-list-gn (jmm-list.AXSPAMGN_at_sohnen-moe.com)
Date: 09/24/04 

Date: Thu, 23 Sep 2004 23:07:33 -0700

Hello,
   Java v1.4.2_05.
   I am using the URL and HttpsURLConnection classes in a program. As soon
as the openConnection() method is called, the CPU usage goes to 100%
greatly slowing the functioning of other programs. When the connection
closes, the usage drops back to normal.
   Is this expected? A possible problem in the JVM?
   Is there an alternate, low CPU usage, way of connecting?

Here is the code that pegs the CPU meter (less the exception code):

     URL url;
     String url_str = protocol + "://" + hostname
                      + "/" + prefix + "/" + service;

     // Create new URL and connect
     //
     // Let Sun's JSSE to deal with SSL
     java.security.Security.addProvider(
                 new com.sun.net.ssl.internal.ssl.Provider());
     System.getProperties().put("java.protocol.handler.pkgs",
                "com.sun.net.ssl.internal.www.protocol");
     url = new URL(url_str);
     HttpsURLConnection connection =
        (HttpsURLConnection) url.openConnection();

     // Setup HTTP POST parameters
     connection.setDoOutput (true);
     connection.setDoInput (true);
     connection.setUseCaches(true);

     // Get POST data from input StringBuffer containing an XML document
     //
     String queryString = XmlIn.toString();

     // POST data
     //
     System.out.println("...sending request..."); System.out.flush();
     OutputStream out = connection.getOutputStream();
     out.write(queryString.getBytes());
     out.close();

     // get data from URL and return the XML doc as a StringBuffer
     //
     String data = "";
     data = readURLConnection(connection);

     // Data is saved and the function exits here closing the connection. 

-- 
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