org xml sax SAXParseException Premature end of file for VALID XML

Question

I am getting very strange  Premature end of file   exception for last few days on one of our servers  The same configuration XML works fine on another server  We are using Tomcat 5 0 28 on both these servers  This code has been working for ages  7  years   only after recent server crash  we faced this problem on one of the servers  There is no change in XML as well as Java parsing code      The only difference I can see is in Java versions -   Problem Server java version  1 6 0 16  Java TM  SE Runtime Environment  build 1 6 0 16-b01  Java HotSpot TM  64-Bit Server VM  build 14 2-b01  mixed mode   Working Server java version  1 6 0 07  Java TM  SE Runtime Environment  build 1 6 0 07-b06  Java HotSpot TM  64-Bit Server VM  build 10 0-b23  mixed mode   Here is the Java code that has been working for several years -  private void readSource final InputSource in         try           DocumentBuilderFactory dbf   DocumentBuilderFactory newInstance            DocumentBuilder db   dbf newDocumentBuilder            Document doc   db parse in           Element elt   doc getDocumentElement             this readElement  elt          catch   Exception ex             ex printStackTrace            throw new ConfigurationException   Unable to parse configuration information   ex              And here is the exception     Fatal Error   -1 -1  Premature end of file  org xml sax SAXParseException  Premature end of file          at org apache xerces parsers DOMParser parse Unknown Source          at org apache xerces jaxp DocumentBuilderImpl parse Unknown Source          at com circus core Configuration readSource Configuration java 706    I have already tried validating XML and found no errors there  Any idea where else can I look for possible problem    Any pointers would be highly appreciated   TIA  - Manish

User · Answer

Please make sure that you are not consuming your inputstream anywhere before parsing  Sample code is following  the respose below is httpresponse i e  response  and main content is contain inside StringEntity  i e  getEntity   in form of inputStream i e  getContent       InputStream rescontent   response getEntity   getContent    tsResponse  TsResponse  transformer convertFromXMLToObject rescontent

User · Answer

Are you sure that the XML file is in the correct character encoding  FileReader always uses the platform default encoding  so if the  working  server had a default encoding of  say  ISO-8859-1 and the  problem  server uses UTF-8 you would see this error if the XML contains any non-ASCII characters   Does it work if you create the InputSource from a FileInputStream instead of a FileReader

User · Answer

In our case it was an empty AndroidManifest xml   While upgrading Eclispe we ran into the usual trouble  and AndroidManifest xml must have been checked into SVN by the build script after being clobbered   Found it by compiling from inside Eclipse  instead of from the command line

User · Answer

It is a problem with Java InputStream  When the stream is read once the file offset position counter is moved to the end of file  On the subsequent read by using the same stream you ll get this error  So you have to close and reopen the stream again or call inputStream reset   to reset the offset counter to its initial position

User · Answer

If input stream is not closed properly then this exception may happen  make sure   If inputstream  used is not used  Before  in some way then where you are intended to read  i e if read 2nd time from same input stream in single operation then 2nd call will get this exception  Also make sure to close input stream in finally block or something like that

User · Answer

This is resolved  The problem was elsewhere  Another code in cron job was truncating XML to 0 length file  I have taken care of that

User · Answer

This exception only happens if you are parsing an empty String empty byte array   below is a snippet on how to reproduce it   String xml           lt -- deliberately an empty string  ByteArrayInputStream xmlStream   new java io ByteArrayInputStream xml getBytes     Unmarshaller u   JAXBContext newInstance      u setSchema       u unmarshal  xmlStream        lt -- here it will fail

[java] org.xml.sax.SAXParseException: Premature end of file for VALID XML

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[java] org.xml.sax.SAXParseException: Premature end of file for *VALID* XML

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[java] org.xml.sax.SAXParseException: Premature end of file for VALID XML