java.net.SocketException: Unexpected end of file from server

Bonjour a tous,

Je veut télécharger mes fichiers sous forme de flux, et lors de la récupération de mon flux a partir du serveur j'ai cette exception, mais je lé seulement si je dépasse 200 fichiers :

Code:

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java.net.SocketException: Unexpected end of file from server
        at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:769)
        at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632)
        at sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:766)
        at sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:632)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1000)
        at fr.efl.els.frontweb.controller.SearchSimpleController.getUploadElement(SearchSimpleController.java:1269)
        at org.apache.jsp.html.jsp.result.telechargeNew_jsp._jspService(telechargeNew_jsp.java:51)

Voici le code de l'appelle :

Code:

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news = new URL(adresse);
				if (LOGGER.isDebugEnabled())
					LOGGER.debug("-------******  news: " + news);
 
				HttpURLConnection urlconnection = (HttpURLConnection)news.openConnection();
				urlconnection.setDoOutput(true);
				urlconnection.setDoInput(true);
				urlconnection.setUseCaches (false);  
				urlconnection.setDefaultUseCaches (false); 
				urlconnection.setChunkedStreamingMode(chunk_size);
				urlconnection.setRequestProperty("uris", sb.toString());
				urlconnection.setReadTimeout(0);
 
				OutputStreamWriter out = new OutputStreamWriter(urlconnection.getOutputStream());
				out.write(sb.toString());
 
				InputStream is = urlconnection.getInputStream();
 
				int f = -1;
 
				File tmpFile = File.createTempFile("documentation", ".zip");
 
				byte buf[] = new byte[buf_size];
				int length = 0;
				BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(tmpFile));	
				while ((length = is.read(buf)) > 0) {
					bos.write(buf, 0, length);
				}
				bos.close();
				is.close();
 
				LOGGER.info("-------******  response: " + response.getOutputStream().toString());
 
 
 
				response.setContentType("application/zip");
				response.addHeader("Content-Disposition", "attachment; filename=" + tmpFile.getName());
				response.setHeader("Cache-Control","max-age=" + 90000);
				response.addHeader("Content-description","My Description");
 
				byte[] docfile = loadFile(tmpFile.getPath());
				response.setContentLength(docfile.length);
				f = -1;
				is = new FileInputStream(tmpFile);
 
				copy(is, response.getOutputStream());
				response.getOutputStream().flush();
 
				is.close();

Sachant que j'ai augmenté la taille mémoire de la JVM et celle de catalina, et mettre les timeout a 60 minutes.

Merci d'avance de vous réponse