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From "Andy Seaborne (JIRA)" <j...@apache.org>
Subject [jira] Closed: (JENA-12) Turtle Files with a UTF-8 BOM fail to parse
Date Wed, 29 Dec 2010 17:53:49 GMT

     [ https://issues.apache.org/jira/browse/JENA-12?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Andy Seaborne closed JENA-12.
-----------------------------


> Turtle Files with a UTF-8 BOM fail to parse
> -------------------------------------------
>
>                 Key: JENA-12
>                 URL: https://issues.apache.org/jira/browse/JENA-12
>             Project: Jena
>          Issue Type: Bug
>          Components: RIOT
>         Environment: Windows 7, latest Sun Java Runtime, Jena 2.6.4
>            Reporter: Rob Vesse
>            Assignee: Andy Seaborne
>         Attachments: ttl-with-bom.ttl
>
>
> If a Turtle file has a BOM at the start then Jena will refuse to parse it giving the
following error:
> Exception in thread "main" com.hp.hpl.jena.n3.turtle.TurtleParseException: Lexical error
at line 1, column 2.  Encountered: "@" (64), after : "\ufeff"
>     at com.hp.hpl.jena.n3.turtle.ParserTurtle.parse(ParserTurtle.java:44)
>     at com.hp.hpl.jena.n3.turtle.TurtleReader.readWorker(TurtleReader.java:21)
>     at com.hp.hpl.jena.n3.JenaReaderBase.readImpl(JenaReaderBase.java:101)
>     at com.hp.hpl.jena.n3.JenaReaderBase.read(JenaReaderBase.java:68)
>     at com.hp.hpl.jena.rdf.model.impl.ModelCom.read(ModelCom.java:226)
>     at TurtleWithBOM.main(TurtleWithBOM.java:31)
> The code I used to produce this error was as follows:
> import com.hp.hpl.jena.rdf.model.*;
> import com.hp.hpl.jena.util.FileManager;
> import java.io.*;
> public class TurtleWithBOM
> {
>     public static void main(String[] args)
>     {
>         // create an empty model
>         Model model = ModelFactory.createDefaultModel();
>         InputStream in = FileManager.get().open( "ttl-with-bom.ttl" );
>         if (in == null)
>             {
>             throw new IllegalArgumentException( "File: ttl-with-bom.ttl not found");
>         }
>         // read the Turtle file
>         model.read(in, "", "TTL");
>         // write it to standard out
>         model.write(System.out);
>     }
> }
> A sample Turtle file used with the above code is attached to this issue.
> The data files are coming from my software which is all written in .Net and when outputting
in UTF-8 the default behaviour of .Net is to include the BOM at the start of the file. The
BOM is not required for UTF-8 but it is not forbidden so I think this should be fixed (if
possible) for future releases. I will be modifying my software so that output of the BOM can
be disabled by my users if desired 
> Looking at the error message given I expect that the same problem would also affect N3
files since they are using the same reader afaict from the error trace. 

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