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POJava 7 URL Connection Fail
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copied!<p>The following code used to work fine under Java 6 (and earlier) but it stopped working after updating to JRE 7 (Java 7).</p> <p>The URL is an FTP file:</p> <blockquote> <p><a href="ftp://ftp-private.ncbi.nlm.nih.gov/pubchem/.fetch/96/4133257873201306969.sdf.gz" rel="nofollow">ftp://ftp-private.ncbi.nlm.nih.gov/pubchem/.fetch/96/4133257873201306969.sdf.gz</a></p> </blockquote> <p>Here is the output I get:</p> <blockquote> <p>application/octet-stream -1 [Ljava.lang.StackTraceElement;@5419f97c</p> </blockquote> <p>And here is my code:</p> <pre><code>public static void store(URL url, File targetFile){ try { System.out.println(url); URLConnection uc = url.openConnection(); String contentType = uc.getContentType(); System.out.println(contentType); int contentLength = uc.getContentLength(); System.out.println(contentLength); Settings.setDownloadSize(contentLength); if (contentType.startsWith("text/") || contentLength == -1) { throw new IOException("This is not a binary file."); } InputStream raw = uc.getInputStream(); InputStream in = new BufferedInputStream(raw); byte[] data = new byte[contentLength]; int bytesRead = 0; StatusPanel.updateProgrssBar(bytesRead); int offset = 0; while (offset < contentLength) { bytesRead = in.read(data, offset, data.length - offset); if (bytesRead == -1) { break; } offset += bytesRead; StatusPanel.updateProgrssBar(offset); } in.close(); if (offset != contentLength) { throw new IOException("Only read " + offset + " bytes; Expected " + contentLength + " bytes"); } FileOutputStream out = new FileOutputStream(targetFile); out.write(data); out.flush(); out.close(); //StatusPanel.setStatus("File has been stored at " + targetFile.toString()); //System.out.println("file has been stored at " + targetFile.toString()); } </code></pre> <p>The content length returns -1: </p> <pre><code>Area: API: Networking Synopsis: Server Connection Shuts Down when Attempting to Read Data When http Response Code is -1 </code></pre> <p>How do I make this code compatible with Java 7?</p> <p>Description: As a result of the bug fix for CR 6886436, the HTTP protocol handler will close the connection to a server that sends a response without a valid HTTP status line. When this occurs, any attempt to read data on that connection results in an IOException. </p> <p>For example, the following code is problematic:</p> <pre><code>public static void test () throws Exception { ..... HttpURLConnection urlc = (HttpURLConnection)url.openConnection(); .... System.out.println ("Response code: " + urlc.getResponseCode()); /** Following line throws java.io.IOException: Invalid Http response * when Response Code returned was -1 */ InputStream is = urlc.getInputStream(); // PROBLEMATIC CODE </code></pre> <p>To work around this problem, check the return value from the getResponseCode method and deal with a -1 value appropriately; perhaps by opening a new connection, or invoking getErrorStream on the stream. Nature of incompatibility: behavioral RFE: 7055058</p> <p>The problem is definitely with <code>getContentLength()</code> method.</p> <p>With JRE6, this method returns a value, but with JRE7 I get -1.</p>

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