Java Socket Connection Error
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Java.net.connectexception Connection Refused No Further Information Minecraft
takes a minute: Sign up Java socket Client/Server connection refused issue up vote 0 down vote favorite I have tried everything but nothing seems to work. I am loosing my mind and if anyone can help that would be great. I am writing a simple client/server code where i have echoclient.class which was given and i am suppose to run that java.net.connectexception connection timed out connect in java against the server i write all on localhost. echoClient class sends a message and i am suppose to reverse the string and send it back. i keep getting connection refused with echo client class but when i run echo server it works fine. any help??? this is my code: import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.Socket; import java.net.ServerSocket; public class EchoServer { public static void main(String[] args) throws Exception { int port = Integer.parseInt(args[1]); String hostid = args[0]; ServerSocket echoServer = new ServerSocket(port); System.out.println("Success"); try{ Socket echoClient = new Socket(hostid, port); echoClient = echoServer.accept(); System.out.println("Connection made"); // while(true){ while ((echoServer.isClosed() != true) || (echoClient.isClosed() != true)) { BufferedReader reader = new BufferedReader(new InputStreamReader(echoClient.getInputStream())); String message = reader.readLine(); PrintWriter writer = new PrintWriter(echoClient.getOutputStream(), true); while(message.contains("#") != true || message.contains("$") != true){ String builder = new StringBuilder(message).reverse().toString(); writer.println(builder + "\n"); }//writer.close(); System.out.println(message + "\n"); writer.close(); echoServer.close(); echoClient.close(); } }catch(IOException ex){ ex.printStackTrace(); } } } and this is the results: java -cp . EchoClient 127.0.0.1 1234 Exception in thread "main" java.net.ConnectException: Connection refused at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345) at java.net.AbstractPlainSocketImpl.connectToAdd
refused: connect in Java java.net.ConnectException: Connection refused: connect is one of the most common networking exceptions in Java. This error comes when java.net.connectexception connection refused connect in jmeter you are working with client-server architecture and trying to make TCP
Java.net.connectexception Connection Timed Out No Further Information
connection from the client to the server. Though this is not as cryptic as java.lang.OutOfMemoryError: Java heap
Java Net Connectexception Connection Refused Linux
Space or java.lang.UnsupportedClassVersionError, it's still a frequent problem in distributed Java applications. java.net.ConnectException: Connection refused: connect also comes in the case of RMI (Remote Method Invocation) because RMI http://stackoverflow.com/questions/32671143/java-socket-client-server-connection-refused-issue also uses TCP-IP protocol underneath. While writing client socket code in Java, You should always provide proper handling of this exception. In this Java tutorial, we will see why connection refused exception comes and how to solve java.net.ConnectException: Connection refused: connect Exception in Java. Normally, Java books like Head First Java won't teach you much http://javarevisited.blogspot.com/2013/02/java-net-ConnectException-Connection-refused.html about how to deal with such exception, it's simply too much to ask for a beginner's book. java.net.ConnectException: Connection refused Error - Possible reasons Connection refused is a clear case of a client trying to connect on a TCP port but not able to succeed. Here are some of the possible reason why java.net.ConnectException: Connection refused: connect comes: 1) Client and Server, either or both of them are not in the network. Yes it's possible that they are not connected to LAN or internet or any other network, in that case, Java will throw "java.net.ConnectException: Connection refused" exception on client side. 2) Server is not running The second most common reason is the server is down and not running. In that case, also you will get java.net.ConnectException: Connection refused error. What I don't like is that the message it gives, no matter what is the reason it prints the same error. By the way, you can use following networking commands e.g. ping to check
Certification Databases Caching Books Engineering Languages Frameworks Products This Site Careers Other all forums Forum: Sockets and Internet Protocols Connection Refused Error Mellihoney https://coderanch.com/t/206990/sockets/java/Connection-Refused-Error Michael Ranch Hand Posts: 124 posted 10 years ago Hi all, I have implemented simple Client and Server using Java Socket API. The client socket was created as: Socket socket http://www.javaworld.com/javaworld/jw-09-1999/jw-09-timeout.html = new Socket("localhost", 20001); System.out.println("connecting to server localhost on port *20001*..."); //more IO operation The server socket was created as: try{ server = new ServerSocket(20001); System.out.println("starting the local server on connection refused port 20001..."); } catch (IOException e){ System.out.println("Could not listen on port 20001"); } try{ client = server.accept(); } catch (IOException e) { System.out.println("Accept failed: 8123"); } //more IO operation I got a "Connection Refused" Error in the client program. My machine running windows XP professional, serving as both client and server (I started the server first and then run the connectexception connection refused client program attempting to connect to the server). Can anyone help me? Thanks in advance [ April 02, 2006: Message edited by: Mellihoney Michael ] a beginner in java Tal Nathan Tal Nathan Greenhorn Posts: 13 posted 10 years ago Could you post more of your code so we can get a bigger picture? Another simple test is to telnet into your server socket and see if a connection can be established. telnet localhost
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