[Pellet-users] need help in the exception ->NoClassDefFoundError:org.relaxng.datatype.DatatypeException

[Michael Grove]

On Feb 6, 2008, at 4:43 PM, Eman Hossny wrote:

> Hello,
> i have an ontology file & i need to read this ontology into  
> OntoModel, but when i write the line
> OntModel ontModel = ModelFactory.createOntologyModel 
> (PelletReasonerFactory.THE_SPEC );
> the following exception appear, can anyone help be in this exception:
> java.lang.NoClassDefFoundError: org/relaxng/datatype/DatatypeException

This sounds like a classpath issue.  There are a number of jars of  
third party libraries (like Jena, since you're using the Jena  
interface) that Pellet needs to operate properly.  Check that both  
relaxngDatatype.jar and xsdlib.jar are in your classpath, I don't  
recall which has that exact class, but they should both be in your path.

Cheers,

Mike

>
>
> -- 
> Eman Hossny,
> Teacher Assistant,
> Computer Science Department,
> Faculty of Computers and Information
> Cairo University, Egypt
>
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