java - How to fix the error "org.xml.sax.SAXParseException / Content is not allowed in prolog"? -

i have following class 2 methods. openinputstream creates input stream, subsequently fed readdocument create xml document stream.

public class xmlreader {     protected inputstream openinputstream(final string path)             throws ioexception {         final inputstream inputstream;         inputstream = ioutils.toinputstream(path, "utf-8");         return inputstream;     }     protected document readdocument(final inputstream stream)             throws parserconfigurationexception, saxexception, ioexception {         final documentbuilderfactory dbfac =                 documentbuilderfactory.newinstance();         final documentbuilder docbuilder = dbfac.newdocumentbuilder();         return docbuilder.parse(stream);     } } 

then have following test:

public class xmlreadertests {     @test     public void parsingofmapfiles() throws ioexception,             saxexception, parserconfigurationexception {         final string[] dirs = new string[] {                 "01_phoenix1",                 "02_phoenix2",                 "03_guadalupe",                 "04_sandiego_miramarroad",                 "05_berlin_alexanderplatz",                 "06_portland_forestavenue",                 "07_hartford_lafayettehudsonstreet",                 "08_fortworth",                 "09_charleston_calhounstreetmeetingstreet",                 "10_losangeles_pershingsquare",                 "11_uelzen"         };         (final string dir : dirs) {             final xmlreader objectundertest = new xmlreader();             final string path =                     string.format("src/test/resources/mc/e-2015-10-13_1/%s/map.osm",                             dir);             final file file = new file(path);             assert.asserttrue(file.canread());             final inputstream inputstream =                     objectundertest.openinputstream(file.getabsolutepath());             final document doc = objectundertest.readdocument(inputstream);             assert.assertnotnull(doc);         }     } } 

readdocument throws exception

org.xml.sax.saxparseexception; linenumber: 1; columnnumber: 1; content not allowed in prolog. @ com.sun.org.apache.xerces.internal.parsers.domparser.parse(domparser.java:257) @ com.sun.org.apache.xerces.internal.jaxp.documentbuilderimpl.parse(documentbuilderimpl.java:347) @ javax.xml.parsers.documentbuilder.parse(documentbuilder.java:121) @ xmlreader.readdocument(xmlreader.java:26) @ xmlreadertests.parsingofmapfiles(xmlreadertests.java:40)

you can find source code , xml files i'm trying read here.

how can fix error?

update 1: changing openstream to

protected inputstream openinputstream(final string path)         throws ioexception {     return new bominputstream(ioutils.toinputstream(path, "utf-8")); } 

or

protected inputstream openinputstream(final string path)         throws ioexception {     return new bominputstream(ioutils.toinputstream(path)); } 

didn't help.

update 2:

if change openinputstream method that

protected inputstream openinputstream(final string path)         throws ioexception {     bominputstream inputstream = new bominputstream(ioutils.toinputstream(path, "utf-8"));     system.out.println("bom: " + inputstream.hasbom());     return inputstream; } 

i output:

bom: false [fatal error] :1:1: content not allowed in prolog.

in xmlreader.openinputstream, change

inputstream = ioutils.toinputstream(path, "utf-8"); 

to

inputstream = new fileinputstream(new file(path)); 

ioutils.toinputstream converts given string inputstream, in case string containing path, instead of file itself.