how to resolve java.net.ConnectException: Connection refused: connect

I want to upload a file with size (>2GB).So i am using applet with servlet to upload it.When i connect applet to servlet using URL class from Java.net which is shown below:-

URL serverUrl=new URL("http://localhost:8084/JFileUpload/TestServlet");
URLConnection connection=serverUrl.openConnection();
connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setRequestProperty("Content-type","application/octet-stream");

i am getting exception when executing the line shown below:-
DataOutputStream outStream=new DataOutputStream(connection.getOutputStream());

java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:520)
at java.net.Socket.connect(Socket.java:470)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:523)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:231)
at sun.net.www.http.HttpClient.New(HttpClient.java:304)
at sun.net.www.http.HttpClient.New(HttpClient.java:321)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:813)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:765)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:690)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:857)

Please help me to resolve this issue.I am using netbeans IDE6.0 & Tomcat server

[ June 10, 2008: Message edited by: elay Raja ]
[ June 10, 2008: Message edited by: elay Raja ]

Welcome to the JavaRanch.
java.net.ConnectException: Connection refused: connect
This exception usually means that there is no service listening to the port you are attempting to connect to. Can you load this URL in your web browser:
http://localhost:8084/
If you are using Tomcat, you should get a Tomcat welcome screen.

Hi All,

I am having a similar problem.

I have an application running on Websphere 7 Dev environment
http://appl.company.com/appl/home.action
And also on my localhost system
http://localhost/appl/home.action

I am trying to access a URL like below
http://appl.company.com/SiteContent/a.html from the above application

It works perfectly fine on my local system.

But on the development environment, on this particular line :-
String stream = (new java.net.URL(url)).openStream();
I am getting a "java.net.ConnectException: Connection refused" exception

On googling i figured, such problems are either due to one of the following
- The port is wrong (cannot be this option, as same url running perfectly from local system)
- Firewall is stopping it.

Regards,
Darshan Shroff
[email protected]

This was basically a firewall issue. Had to do a port opening from the app server to web server by contacting our Network team.

Regards,
Darshan Shroff
[email protected]