java net SocketException Connection reset by peer socket write error When serving a file

Question

I am trying to implement an HTTP Server using Sockets  If the Client  For example a browser  requests a directory the server displays a list of available files  The problem arises when the client is requesting a file  I get the following error   java net SocketException  Connection reset by peer  socket write error at java net SocketOutputStream socketWrite0 Native Method  at java net SocketOutputStream socketWrite SocketOutputStream java 113  at java net SocketOutputStream write SocketOutputStream java 159  at cf charly1811 java web RequestHandler writeFile RequestHandler java 152  at cf charly1811 java web RequestHandler processRequest RequestHandler java 139  at cf charly1811 java web RequestHandler handleRequest RequestHandler java 110  at cf charly1811 java web RequestHandler run RequestHandler java 86  at java lang Thread run Thread java 745    The stacktrace shows that the problem is coming from the writeFile   methods   private void writeFile File request  throws IOException        InputStream byteReader   new BufferedInputStream new FileInputStream request        byte   buffer   new byte 1024       int bytesRead      while   bytesRead   byteReader read buffer      -1                 outputStream write buffer  0  bytesRead             byteReader close        But I can t figure out what s wrong  Can you help me   EDIT  Thanks everyone for your answers  After I read your answers I understood that the problem was that the Socket when an error occured  Here s was my wrong code      Method to process a single request handleRequest   throw IOException          process here        if the client request a file     writeFile           close socket when the request is processed       The method is called public run         try             If an error occurs the try catch won t be called because it is implemented outside the loop  So when an IOException occurs  the loop just stop and exit the program         while true                        handleRequest                        catch IOException e               Handle exception here           And my new code was looking like this      Method to process a single request handleRequest        try              process here            if the client request a file         writeFile               close socket when the request is processed              If this exception occurs the catch   method will be called     catch IOException e                   handle exception here             The method is called public run         while true                        handleRequest

User · Answer

This problem is usually caused by writing to a connection that had already been closed by the peer  In this case it could indicate that the user cancelled the download for example

User · Answer

It is possible for the TCP socket to be  closing  and your code to not have yet been notified   Here is a animation for the life cycle  http   tcp cs st-andrews ac uk index shtml page connection lifecycle  Basically  the connection was closed by the client   You already have throws IOException and SocketException extends IOException   This is working just fine   You just need to properly handle IOException because it is a normal part of the api   EDIT   The RST packet occurs when a packet is received on a socket which does not exist or was closed   There is no difference to your application   Depending on the implementation the reset state may stick and closed will never officially occur

User · Answer

I face this problem but resolution is very simple  I am writing the 1 MB file in 1024 Byte Buffer causing this issue  To Understand refer code before and After Fix  Code with Excepion DataOutputStream dos   new DataOutputStream s getOutputStream             FileInputStream fis   new FileInputStream file           byte   buffer   new byte 1024                    while  fis read buffer   gt  0                dos write buffer                   After Fixes  DataOutputStream dos   new DataOutputStream s getOutputStream             FileInputStream fis   new FileInputStream file           byte   buffer   new byte 102400                    while  fis read buffer   gt  0                dos write buffer

[java] java.net.SocketException: Connection reset by peer: socket write error When serving a file

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