Fatal Error 1 1 Content is not allowed in prolog

Question

I m using Java and i m trying to get XML document from some http link  Code I m using is   URL url   new URL link    HttpURLConnection connection    HttpURLConnection url openConnection    connection setRequestMethod  GET    connection connect    Document doc   null   CountInputStream in   new CountInputStream url openStream     doc   DocumentBuilderFactory newInstance   newDocumentBuilder   parse in     Don t pay attention at CountInputStream  it s some special class acting like regular input stream    Using the code above  I sometimes got error Fatal Error  1 1  Content is not allowed in prolog  I assume that is has something to do with bad format of xml  but I have no idea how to fix it

User · Accepted Answer

I m turning my comment to an answer  so it can be accepted and this question no longer remains unanswered   The most likely cause of this is a malformed response  which includes characters before the initial  lt  xml     gt   So please have a look at the document as transferred over HTTP  and fix this on the server side

User · Answer

It could be not supported file encoding  Change it to UTF-8 for example  I ve done this using Sublime

User · Answer

Looks like you forgot adding correct headers to your get request  ask the REST API developer or you specific API description    HttpURLConnection connection    HttpURLConnection url openConnection    connection header  Accept    application xml   connection setRequestMethod  GET    connection connect      or  connection header  Accept    application xml version 1

User · Answer

There are certainly some weird characters  e g  BOM  or some whitespace before the XML preamble   lt  xml      gt

User · Answer

Someone should mark Johannes Wei   s comment as the answer to this question  That is exactly why xml documents can t just be loaded in a DOM Document class   http   en wikipedia org wiki Byte order mark

User · Answer

The real solution that I found for this issue was by disabling any XML Format post processors   I have added a post processor called  jp gc - XML Format Post Processor  and started noticing the error  Fatal Error  1 1  Content is not allowed in prolog   By disabling the post processor had stopped throwing those errors

[java] Fatal Error :1:1: Content is not allowed in prolog

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