Re: [namedgraphs] [Fwd: Re: Problem related to Jena 2.6.0]

[Tim P. <ti...@pa...>]

Hi Riccardo,

 I have done a fresh checkout.
 I use Maven to build ng4j.

 Editted pom.xml to use 2.6.0 for jena and jenatest..

 then executed:

 mvn install

 However the connection to the jena repository timed out.
 As you probably know there have been some upheavals in the jena ecosystem.

 I changed the repository location to http://openjena.org/repo/
 (not strictly necessary as these are mirrored)

 This resulted in:

 INFO] Compilation failure

 /home/timp/workspace/ng4j/src/de/fuberlin/wiwiss/ng4j/trix/TriXReader.java:[162,35]
 com.hp.hpl.jena.graph.impl.LiteralLabel is abstract; cannot be
 instantiated

 /home/timp/workspace/ng4j/src/de/fuberlin/wiwiss/ng4j/trix/TriXReader.java:[172,35]
 com.hp.hpl.jena.graph.impl.LiteralLabel is abstract; cannot be
 instantiated

 /home/timp/workspace/ng4j/src/de/fuberlin/wiwiss/ng4j/trix/TriXReaderWithExtensions.java:[168,35]
 com.hp.hpl.jena.graph.impl.LiteralLabel is abstract; cannot be
 instantiated

 /home/timp/workspace/ng4j/src/de/fuberlin/wiwiss/ng4j/trix/TriXReaderWithExtensions.java:[178,35]
 com.hp.hpl.jena.graph.impl.LiteralLabel is abstract; cannot be
 instantiated


 which is the same problem as you.

 I then did
  mvn -DdownloadJavadocs=true -DdownloadSources=true eclipse:clean
 eclipse:eclipse
 which creates a new set of eclipse configuration files.

 In TriXReader substitute:

        public void objectPlainLiteral(String value, String lang) {
                LiteralLabel ll = LiteralLabelFactory.create(value, lang);
        this.object =  Node.createLiteral(ll);
                addTriple();
        }

        public void objectTypedLiteral(String value, String datatypeURI) {
                // No idea what that line does, is copy&paste from
ModelCom.createTypedLiteral
                RDFDatatype dt =
TypeMapper.getInstance().getSafeTypeByName(datatypeURI);
                LiteralLabel ll =
LiteralLabelFactory.createLiteralLabel( value, "", dt );
        this.object =  Node.createLiteral(ll);
                addTriple();
        }


 In TriXReaderWithExtensions we do the same (cut and paste issues :( )

        public void objectPlainLiteral(String value, String lang) {
                LiteralLabel ll = LiteralLabelFactory.create(value, lang);
        this.object =  Node.createLiteral(ll);
                addTriple();
        }

        public void objectTypedLiteral(String value, String datatypeURI) {
                // No idea what that line does, is copy&paste from
ModelCom.createTypedLiteral
                RDFDatatype dt =
TypeMapper.getInstance().getSafeTypeByName(datatypeURI);
                LiteralLabel ll =
LiteralLabelFactory.createLiteralLabel( value, "", dt );
        this.object =  Node.createLiteral(ll);
                addTriple();
        }

 This gets us working with Eclipse and Maven.

 Shall I commit these changes?

 cheers
 Tim


2010/1/18 Riccardo Tasso wrote:
> Hi Tim,
>   I've just imported NG4J 0.9.2 sourcecode as an Eclipse project and changed
> every library referring to jena 2.6.0 in the corresponding jena 2.6.2.
> I have 4 errors (of the same type fortunately). Two of them in the class
> de.fuberlin.wiwiss.ng4j.trix.TriXReader (lines 162 and 172) and two in the
> class de.fuberlin.wiwiss.ng4j.trix.TriXReaderWithExtensions (lines 168 and
> 178).
>
> The error is in the instructions:
>   new LiteralLabel(value, lang);
>   new LiteralLabel(value, null, dt);
> and the report is:
> "Cannot instantiate the type LiteralLabel"
>
> Can you help me in solving this issue?
> Thank you,
>   Riccardo
>