Re: Tomcat download stream gets broken

[Filip Hanik - Dev Lists]

Looks like the client disconnected, that is a fairly normal scenario.
You have to be able to handle the error if a client disconnects prior to having 
downloaded all the content

Filip

On 5/19/2011 8:46 AM, Gerardo Corro wrote:

Trying gmail

Hi all,

I have a file download servlet running on Tomcat, the code is


     public void service(HttpServletRequest request,
HttpServletResponse response) throws IOException {
         byte buf[] = new byte[1024 * 4];
         try {
             File file = new File(realFilename);
             int size = (int) file.length();
             BufferedInputStream realFile = new BufferedInputStream(new
FileInputStream(file));
             OutputStream out = response.getOutputStream();
             response.setContentLength(size);
             while (true) {
                 int count = realFile.read(buf);
                 if (count == -1) {
                     break;
                 }
                 out.write(buf, 0, count);
             }
             out.flush();
         } catch (FileNotFoundException e) {
             logger.error("Stream download failed, file not found: " +
realFilename, e);
             response.sendError(404);
         } catch (Exception e) {
             logger.error("DownloadException:", e);
         }
     }

However once in a while I get an error that prevents files from being
downloaded:


DownloadException:  java.net.SocketException: Broken pipe
         at 
org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:366)
         at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:432)
         at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:347)
         at 
org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:392)
         at 
org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:381)
         at 
org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
         at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
         at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
         at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
         at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
         at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
         at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
         at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
         at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
         at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
         at 
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
         at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
         at 
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:113)
         at java.lang.Thread.run(Thread.java:619)
Caused by: java.net.SocketException: Broken pipe
         at java.net.SocketOutputStream.socketWrite0(Native Method)
         at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
         at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
         at 
org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:750)
         at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:432)
         at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:347)
         at 
org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:773)
         at 
org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:118)
         at 
org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:583)
         at org.apache.coyote.Response.doWrite(Response.java:560)
         at 
org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:361)
         ... 23 more

How can I prevent such an error?

Thanks!!!

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