Program: 4569
Project: 4569
Buggy source:
/** 
 * Sends a push request for the given file.  Returns false iff no push could be sent, i.e., because no routing entry exists. That generally means you shouldn't send any more pushes for this file.
 * @param file the <tt>RemoteFileDesc</tt> constructed from the query hit, containing data about the host we're pushing to
 * @return <tt>true</tt> if the push was successfully sent, otherwise<tt>false</tt>
 */
public boolean sendPush(RemoteFileDesc file){
  debug("String_Node_Str");
  if (file.isReplyToMulticast()) {
    PushRequest pr=new PushRequest(GUID.makeGuid(),(byte)1,file.getClientGUID(),file.getIndex(),RouterService.getNonForcedAddress(),RouterService.getNonForcedPort());
    router.sendMulticastPushRequest(pr);
    return true;
  }
  Set proxies=file.getPushProxies();
  if (!proxies.isEmpty()) {
    debug("String_Node_Str");
    boolean requestSuccessful=false;
    final String requestString="String_Node_Str" + Base32.encode(file.getClientGUID());
    final String nodeString="String_Node_Str";
    final String nodeValue=NetworkUtils.ip2string(RouterService.getAddress()) + "String_Node_Str" + RouterService.getPort();
    Iterator iter=proxies.iterator();
    while (iter.hasNext() && !requestSuccessful) {
      PushProxyInterface ppi=(PushProxyInterface)iter.next();
      try {
        String ip=ppi.getPushProxyAddress().getHostName();
        int port=ppi.getPushProxyPort();
        URL url=new URL("String_Node_Str",ip,port,requestString);
        HttpURLConnection connection=(HttpURLConnection)url.openConnection();
        connection.setUseCaches(false);
        connection.setRequestProperty(nodeString,nodeValue);
        requestSuccessful=(connection.getResponseCode() == 202);
        connection.disconnect();
      }
 catch (      MalformedURLException url) {
        ErrorService.error(url);
      }
catch (      IOException ioe) {
      }
    }
    if (requestSuccessful)     return requestSuccessful;
  }
  PushRequest pr=new PushRequest(GUID.makeGuid(),ConnectionSettings.TTL.getValue(),file.getClientGUID(),file.getIndex(),RouterService.getAddress(),RouterService.getPort());
  try {
    router.sendPushRequest(pr);
  }
 catch (  IOException e) {
    return false;
  }
  return true;
}

Fixed version (ground truth):
/** 
 * Sends a push request for the given file.  Returns false iff no push could be sent, i.e., because no routing entry exists. That generally means you shouldn't send any more pushes for this file.
 * @param file the <tt>RemoteFileDesc</tt> constructed from the query hit, containing data about the host we're pushing to
 * @return <tt>true</tt> if the push was successfully sent, otherwise<tt>false</tt>
 */
public boolean sendPush(RemoteFileDesc file){
  debug("String_Node_Str");
  if (file.isReplyToMulticast()) {
    byte[] addr=RouterService.getNonForcedAddress();
    int port=RouterService.getNonForcedPort();
    if (NetworkUtils.isValidAddress(addr) && NetworkUtils.isValidPort(port)) {
      PushRequest pr=new PushRequest(GUID.makeGuid(),(byte)1,file.getClientGUID(),file.getIndex(),addr,port);
      router.sendMulticastPushRequest(pr);
      return true;
    }
  }
  byte[] addr=RouterService.getAddress();
  int port=RouterService.getPort();
  if (!NetworkUtils.isValidAddress(addr) || !NetworkUtils.isValidPort(port))   return false;
  Set proxies=file.getPushProxies();
  if (!proxies.isEmpty()) {
    debug("String_Node_Str");
    boolean requestSuccessful=false;
    final String requestString="String_Node_Str" + Base32.encode(file.getClientGUID());
    final String nodeString="String_Node_Str";
    final String nodeValue=NetworkUtils.ip2string(addr) + "String_Node_Str" + port;
    Iterator iter=proxies.iterator();
    while (iter.hasNext() && !requestSuccessful) {
      PushProxyInterface ppi=(PushProxyInterface)iter.next();
      try {
        String ppIp=ppi.getPushProxyAddress().getHostName();
        int ppPort=ppi.getPushProxyPort();
        URL url=new URL("String_Node_Str",ppIp,ppPort,requestString);
        HttpURLConnection connection=(HttpURLConnection)url.openConnection();
        connection.setUseCaches(false);
        connection.setRequestProperty(nodeString,nodeValue);
        requestSuccessful=(connection.getResponseCode() == 202);
        connection.disconnect();
      }
 catch (      MalformedURLException url) {
        ErrorService.error(url);
      }
catch (      IOException ioe) {
      }
    }
    if (requestSuccessful)     return requestSuccessful;
  }
  PushRequest pr=new PushRequest(GUID.makeGuid(),ConnectionSettings.TTL.getValue(),file.getClientGUID(),file.getIndex(),addr,port);
  try {
    router.sendPushRequest(pr);
  }
 catch (  IOException e) {
    return false;
  }
  return true;
}