Why am I getting this error Premature end of file

Question

I am trying to parse an XML response  but I am failing miserably  I thought initially  that the xml was just not being returned in the response  so I crafted up the code below with a direct link to my xml file online  I am able to print the XML to screen with no problems  However when I call my parse method I get Premature end of file    It works if I pass the URL directly     builder parse        but fails when I passed an InputStream     builder parse connection getInputStream        try       URL url   new URL xml       URLConnection uc    url openConnection        HttpURLConnection  connection    HttpURLConnection  uc       connection setDoInput true       connection setDoOutput true        InputStream instream      InputSource source        get XML from InputStream     if connection getResponseCode   gt   200           connection connect                   instream   connection getInputStream                     parseDoc instream                  else          instream   connection getErrorStream              catch  MalformedURLException e           TODO Auto-generated catch block     e printStackTrace      catch  IOException e           TODO Auto-generated catch block     e printStackTrace      catch  ParserConfigurationException e           TODO Auto-generated catch block     e printStackTrace      catch  SAXException e           TODO Auto-generated catch block     e printStackTrace          static void parseDoc InputStream instream  throws ParserConfigurationException   SAXException  IOException      BufferedReader buff read   new BufferedReader new InputStreamReader instream  UTF-8         String  inputLine   null       while  inputLine   buff read readLine      null           System out println inputLine            DocumentBuilderFactory factory  DocumentBuilderFactory newInstance      factory isIgnoringElementContentWhitespace      DocumentBuilder builder   factory newDocumentBuilder      Document doc   builder parse instream        The errors I am getting        Fatal Error   1 1  Premature end of file  org xml sax SAXParseException  Premature end of file      at com sun org apache xerces internal parsers DOMParser parse Unknown Source      at com sun org apache xerces internal jaxp DocumentBuilderImpl parse Unknown Source      at javax xml parsers DocumentBuilder parse Unknown Source      at com ameba api network MainApp parseDoc MainApp java 78      at com ameba api network MainApp main MainApp java 41

User · Answer

One of the other reason is   you should whitelist your IP address  IPv4  in your mongodb settings  Hope it resolves

User · Answer

When you do this   while  inputLine   buff read readLine      null           System out println inputLine           You consume everything in instream  so instream is empty   Now when try to do this   Document doc   builder parse instream     The parsing will fail  because you have passed it an empty stream

User · Answer

Use inputstream once don t use it multiple times and Do inputstream close

User · Answer

For those who reached this post for Answer   This happens mainly because the InputStream the DOM parser is consuming is empty  So in what I ran across  there might be two situations    The InputStream you passed into the parser has been used and thus emptied  The File or whatever you created the InputStream from may be an empty file or string or whatever  The emptiness might be the reason caused the problem  So you need to check your source of the InputStream

User · Answer

I resolved the issue by converting the source feed from http   www news18 com rss politics xml to https   www news18 com rss politics xml  with http below code was creating an empty file which was causing the issue down the line       String feedUrl    https   www news18 com rss politics xml        File feedXmlFile   null       try       feedXmlFile  new File  C   opinionpoll newsFeed xml        FileUtils copyURLToFile new URL feedUrl  feedXmlFile               DocumentBuilderFactory dbFactory   DocumentBuilderFactory newInstance              DocumentBuilder dBuilder   dbFactory newDocumentBuilder              Document doc   dBuilder parse feedXmlFile

User · Answer

You are getting the error because the SAXBuilder is not intelligent enough to deal with  blank states   So it looks for at least an  lt xml    gt  declaration  and when that causes a no data response it creates the exception you see rather than report the empty state

User · Answer

I came across the same error  and could easily find what was the problem by logging the exception   documentBuilder setErrorHandler new ErrorHandler          Override     public void warning SAXParseException exception  throws SAXException           log warn exception getMessage                 Override     public void fatalError SAXParseException exception  throws SAXException           log error  Fatal error    exception               Override     public void error SAXParseException exception  throws SAXException           log error  Exception    exception               Or  instead of logging the error  you can throw it and catch it where you handle the entries  so you can print the entry itself to get a better indication on the error

[java] Why am I getting this error Premature end of file?

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