Solved

How do I keep my connection from getting reset?

Posted on 2008-06-23
2
1,577 Views
Last Modified: 2013-12-29
I have a Java applet that uploads and downloads files to a server. With one file in particular, I'm always getting the same exception thrown:
java.net.SocketException:Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at...
    at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(Unknown Source)
    at FTA.copyInputStream(FTA.java:1023)
    etc
and also
java.net.SocketException: Connection reset
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.checkEOF(Unknown Source)
    at...
    at FTA.DownloadZipFile(FTA.java:756)
    etc.
Caused by javax.net.ssl.SSLException: java.net.SocketException: Connection reset
    at...
    at FTA.copyInputStream(FTA.java:1023)
    at FTA.DownloadZipFile(FTA.java:754)
    ... 5 more
Caused by java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    ... 19 more
My question is: what does this mean (beyond the obvious) and how do I get my connection to not reset itself? Thanks.
// FTA.java
 

private String DownloadZipFile()

{

  File f = null;

  try 

  {

    URL u = new URL(Url);

    HttpURLConnection conn = (HttpURLConnection)u.openConnection();
 

    InputStream is = conn.getInputStream();

    f =  File.createTempFile("FTA", ".tmp");

    f.deleteOnExit();

    FileOutputStream fw = new FileOutputStream(f);

    int size = conn.getContentLength();
 

    BufferedOutputStream bos = new BufferedOutputStream( fw );

    copyInputStream(is, bos, size, true );     // line 754
 

    is.close();                                // line 756

    bos.close();

    fw.flush();	

    fw.close();
 

    return f.getAbsolutePath();

  }

  catch (SocketException sx)

  {

    System.err.println(sx.getMessage());

    sx.printStackTrace();

    return null;

  }

  finally {

    if(f != null) { f.delete(); }

  }

}
 

private void copyInputStream(InputStream in, OutputStream out, int totalLength, boolean showProgress) throws IOException

{

  try

  {

    byte[] buffer = new byte[1024];

    Date start = new Date();
 

    int bytesSent = 0;

    int len;                //line 1023 -- how is this throwing an exception???
 

    while ((len = in.read(buffer)) >= 0 && !shouldCancel)

    {

      bytesSent += len;

      out.flush();

    }

    out.flush();

  }

// We might need to try throwing these to the calling method.

  catch (SocketException sx)

  {

    System.err.println(sx.getMessage());

    sx.printStackTrace();

  }

  catch (IOException iox)

  {

    System.err.println(iox.getMessage());

    iox.printStackTrace();

  }

// there should be a finally clause right here to deal with the socket

// resetting the connection

}

Open in new window

0
Comment
Question by:tjgquicken
2 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 21850185
I don't understand how copyInputStream is working *at all* - nothing is written to the OutputStream
0
 
LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 21851263
You can't stop that, it is caused by the client disconnecting. eg. if they cancel the upload/download.
You should instead detect it occurring and handle it garcefully (by basically ignoring it and cancell up/download)

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Python Assistance 7 73
egit plugin on eclipse 8 41
oracle 11g 23 51
MySQL  on Tomcat 8 30
One of the typical problems I have experienced is when you have to move a web server from one hosting site to another. You normally prepare all on the new host, transfer the site, change DNS and cross your fingers hoping all will be ok on new server…
If you don't have the right permissions set for your WordPress location in IIS, you won't be able to perform automatic updates. Here's how to fix the problem.
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now