Home/ Questions/Error: content is not allowed in prolog – quick tips
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Kyle O'Connor
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Asked: 2022-05-18T18:55:28+00:00 In:

Error: content is not allowed in prolog – quick tips

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I have the following java code, but I do not know how to find the correct result. Why has this problem occurred, and how can it be solved? Here is the code that I am running:

<?xml version="1.0" encoding="utf-8"?> 
 <ListDomainsResponse xmlns="http://sdb.amazonaws.com/doc/2009-04-15/">
  <ListDomainsResult>
  <DomainName>Audio</DomainName>
  <DomainName>Course</DomainName>
  <DomainName>DocumentContents</DomainName>
  <DomainName>LectureSet</DomainName>
  <DomainName>MetaData</DomainName>
  <DomainName>Professors</DomainName>
  <DomainName>Tag</DomainName>
  </ListDomainsResult>
  <ResponseMetadata>
  <RequestId>42330b4a-e134-6aec-e62a-5869ac2b4575</RequestId>
  <BoxUsage>0.0000071759</BoxUsage>
  </ResponseMetadata>
 </ListDomainsResponse>
XMLEventReader eventReader = xmlInputFactory.createXMLEventReader(response.getContent());

And this is the error text I receive:

com.amazonaws.http.HttpClient handleResponse: Unable to unmarshall response (ParseError at [row,col]:[1,1]
 Message: Content is not allowed in prolog.): <?xml version="1.0" encoding="utf-8"?> 
 <ListDomainsResponse xmlns="http://sdb.amazonaws.com/doc/2009-04-15/"><ListDomainsResult><DomainName>Audio</DomainName><DomainName>Course</DomainName><DomainName>DocumentContents</DomainName><DomainName>LectureSet</DomainName><DomainName>MetaData</DomainName><DomainName>Professors</DomainName><DomainName>Tag</DomainName></ListDomainsResult><ResponseMetadata><RequestId>42330b4a-e134-6aec-e62a-5869ac2b4575</RequestId><BoxUsage>0.0000071759</BoxUsage></ResponseMetadata></ListDomainsResponse>
 javax.xml.stream.XMLStreamException: ParseError at [row,col]:[1,1]
 Message: Content is not allowed in prolog.
  at com.sun.org.apache.xerces.internal.impl.XMLStreamReaderImpl.next(Unknown Source)
  at com.sun.xml.internal.stream.XMLEventReaderImpl.nextEvent(Unknown Source)
  at com.amazonaws.transform.StaxUnmarshallerContext.nextEvent(StaxUnmarshallerContext.java:153)
  ... (rest of lines omitted)
xml
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2 Answers

  1. Best Answer
    Expert

    The cause: This error happens because your XML and XSD (or DTD) have different encodings:

    XML file header:

    <?xml version='1.0' encoding='utf-8'?>


    XSD file header:

    <?xml version='1.0' encoding='utf-16'?>

    Another case can cause this is when anything appears before the XML document type declaration. In other words, you could have something like this in your buffer:

    helloworld<?xml version="1.0" encoding="utf-8"?>

    or even a special character such as a space.
    The solution: The buffer may contain some special characters known as byte order markers. Do this before passing the buffer to the Parser…

    String xml = "<?xml ...";
xml = xml.trim().replaceFirst("^([\\W]+)<","<");
    • 0

  2. While I was inspecting the xml file with notepad++, and then saving it, I encountered an issue. I did have the top utf-8 <?xml version="1.0" encoding="utf-8"?> tag.

    Fixed by saving the file with Encoding(Tab), Encode in UTF-8,selected (was Encode In UTF-8-BOM).

    • 15

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