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POWhy it throws Write Failed exceptions on my FileServlet
 

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  1. POWhy it throws Write Failed exceptions on my FileServlet
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    <p>I have a web instance which gives downloads with dynamic names by using a file servlet. My current file name is A.apk, I can give the download as A_username.apk. Everything is OK up to now. However, It always throws exceptions even the file download process is successed.</p> <p>My code :</p> <pre><code>public class FileServlet extends HttpServlet { private static final int DEFAULT_BUFFER_SIZE = 10240; // 10KB. private String filePath; public void init() throws ServletException { } protected void doGet(HttpServletRequest request, HttpServletResponse response) { String tag = "" + request.getParameter("tag"); String name = "MyApp"; try { String requestedFile = request.getPathInfo(); this.filePath = "C:/WEBROOT/Test/build/web/andrapp"; // Check if file is actually supplied to the request URI. if (requestedFile == null) { // Do your thing if the file is not supplied to the request URI. // Throw an exception, or send 404, or show default/warning page, or just ignore it. response.sendError(HttpServletResponse.SC_NOT_FOUND); // 404. return; } // Decode the file name (might contain spaces and on) and prepare file object. File file = new File(filePath, URLDecoder.decode(requestedFile, "UTF-8")); // Check if file actually exists in filesystem. if (!file.exists()) { // Do your thing if the file appears to be non-existing. // Throw an exception, or send 404, or show default/warning page, or just ignore it. response.sendError(HttpServletResponse.SC_NOT_FOUND); // 404. return; } // Get content type by filename. String contentType = getServletContext().getMimeType(file.getName()); // If content type is unknown, then set the default value. // For all content types, see: http://www.w3schools.com/media/media_mimeref.asp // To add new content types, add new mime-mapping entry in web.xml. if (contentType == null) { contentType = "application/octet-stream"; } // Init servlet response. response.reset(); response.setBufferSize(DEFAULT_BUFFER_SIZE); response.setContentType(contentType); response.setHeader("Content-Length", String.valueOf(file.length())); response.setHeader("Content-Disposition", "attachment; filename=\"" + name + ".apk" + "\""); // Prepare streams. BufferedInputStream input = null; BufferedOutputStream output = null; try { // Open streams. input = new BufferedInputStream(new FileInputStream(file), DEFAULT_BUFFER_SIZE); output = new BufferedOutputStream(response.getOutputStream(), DEFAULT_BUFFER_SIZE); // Write file contents to response. byte[] buffer = new byte[DEFAULT_BUFFER_SIZE]; int length; while ((length = input.read(buffer)) &gt; 0) { output.write(buffer, 0, length); } System.out.println("Download Success"); } finally { // Gently close streams. close(output); close(input); } } catch (Exception ex) { System.out.println("Download Cancelled"); ex.printStackTrace(); } } // Helpers (can be refactored to public utility class) ---------------------------------------- private static void close(Closeable resource) { if (resource != null) { try { resource.close(); } catch (IOException e) { // Do your thing with the exception. Print it, log it or mail it. e.printStackTrace(); } } } } </code></pre> <p>If the download is OK, it outputs "Download Success" and "Download Cancelled" both. If I cancel the download, it outputs only "Download Cancelled".</p> <p>The exception log :</p> <pre><code> CORE3282: stdout: Download Cancelled CORE3283: stderr: java.io.IOException: WEB8001: Write failed CORE3283: stderr: at com.iplanet.ias.web.connector.nsapi.NSAPIConnector.write(NSAPIConnector.java:789) CORE3283: stderr: at com.iplanet.ias.web.connector.nsapi.NSAPIResponseStream.write(NSAPIResponseStream.java:75) CORE3283: stderr: at org.apache.catalina.connector.ResponseBase.flushBuffer(ResponseBase.java:824) CORE3283: stderr: at org.apache.catalina.connector.HttpResponseBase.flushBuffer(HttpResponseBase.java:794) CORE3283: stderr: at com.iplanet.ias.web.connector.nsapi.NSAPIResponse.flushBuffer(NSAPIResponse.java:127) CORE3283: stderr: at org.apache.catalina.connector.ResponseBase.write(ResponseBase.java:788) CORE3283: stderr: at org.apache.catalina.connector.ResponseStream.write(ResponseStream.java:361) CORE3283: stderr: at java.io.BufferedOutputStream.write(BufferedOutputStream.java:122) CORE3283: stderr: at com.newwap.developer.tools.FileServlet.doGet(FileServlet.java:120) CORE3283: stderr: at javax.servlet.http.HttpServlet.service(HttpServlet.java:787) CORE3283: stderr: at javax.servlet.http.HttpServlet.service(HttpServlet.java:908) CORE3283: stderr: at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:771) CORE3283: stderr: at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:322) CORE3283: stderr: at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509) CORE3283: stderr: at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218) CORE3283: stderr: at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509) CORE3283: stderr: at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:209) CORE3283: stderr: at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:509) CORE3283: stderr: at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157) CORE3283: stderr: at com.iplanet.ias.web.WebContainer.service(WebContainer.java:579) CORE3282: stdout: Download Success </code></pre> <p>It indicates exaclty the line : output.write(buffer, 0, length);</p> <p>Any idea ?</p>
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    1. COIf you encounter exception on line `output.write(buffer, 0, length);` how do you conclude that your download is successful? This error will generally occur if your client disconnected as you were writing the file.
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    2. COThere isn't enough information here, I am missing the root cause of the exception. All you have now is "it doesn't work".
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      1. USGimby
    3. COI have edited the error output. I conclude that my download is successful, because I can get the file after I click the download button. I can open and install the downloaded file. The problem is this. Why I see the exception first ?
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