Regarding jena

[Ankit Verma <an...@impetus.co.in>]

Hi Andy,

Can u pls help me in creating a new web application from scratch.
Secondly i am trying to import wordnet model but facing some error can u pls see
the below error.

the code which i am using is
package test;

import java.io.*;
import com.hp.hpl.jena.db.*;
import com.hp.hpl.jena.rdf.model.*;

/**
* Creates a model in the MySQL database, and loads the 3 WordNet RDF graphs
* into it. This could also be accomplished on the commandline via
* jena.dbcreate and jena.dbload.
*/
public class ImportWordnet {

/** MySQL driver classname */
private static final String mysqlDriver = "com.mysql.jdbc.Driver";

/** URL of database to use */
private static final String DB_URL = "jdbc:mysql://localhost/test";
private static final String DB_TYPE = "MySQL";

/** User credentials */
private static final String DB_USER = "root";
private static final String DB_PASSWORD = "";

/** Name of the Jena model to create */
private static final String MODEL_NAME = "wordnet";

/** Locations of wordnet graphs to load */
private static String WN_NOUNS = "wordnet_nouns-20010201.rdf";
private static String WN_GLOSSARY = "wordnet_glossary-20010201.rdf";
private static String WN_HYPONYMS = "wordnet_hyponyms-20010201.rdf";

/**
* Creates a MySQL backed model and reads the wordnet RDF files into it
*/
public static void main(String args[]) {

try {
// Instantiate database driver
Class.forName(mysqlDriver);
} catch (ClassNotFoundException e) {
System.err.println("MySQL driver class not found");
System.exit(-1);
}

// Get a connection to the db
DBConnection connection = new DBConnection(DB_URL, DB_USER, DB_PASSWORD,
DB_TYPE);

// Get a ModelMaker for database-backed models
ModelMaker maker = ModelFactory.createModelRDBMaker(connection);

// Create a new model named "wordnet".
Model wordnetModel = maker.createModel(MODEL_NAME,true);

try {

// Importing models inside a transaction helps performance.
// Without this, the model each statement is auto-committed as it is
// added.
wordnetModel.begin();

// Read each of the three WordNet documents into the model
//readFileIntoModel(WN_NOUNS, wordnetModel);
readFileIntoModel(WN_GLOSSARY, wordnetModel);
//readFileIntoModel(WN_HYPONYMS, wordnetModel);

// Commit the transaction
wordnetModel.commit();

} catch (FileNotFoundException e) {

System.err.println(e.toString());
} finally {

try {
// Close the database connection
connection.close();
} catch (java.sql.SQLException e) {}
}
}

/**
* Reads RDF from a file into a model
* @param filename Name of the RDF file to read
* @param model The model to read the RDF into
* @throws FileNotFoundException if the file can't be located on the classpath
*/
private static void readFileIntoModel(String filename, Model model)
throws FileNotFoundException {

// Use the class loader to find the input file
InputStream in =
ImportWordnet.class.getClassLoader().getResourceAsStream(filename);

if (in == null) {
throw new FileNotFoundException("File not found on classpath: "+
filename);
}

// Read the triples from the file into the model
model.read(in,null);
}
}

and the error is

"java.io.FileNotFoundException: File not found on classpath:
wordnet_glossary-20010201.rdf"




Thanks and Regards
Ankit Verma
Associate Software Engineer
Impetus Infotech (India) Pvt. Ltd.
Phone: + 91-120.409.2200 x 2773
www.impetus.com<http://www.impetus.com/> <http://www.impetus.com/>



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Re: Regarding jena

[Andy Seaborne <an...@apache.org>]

On 23/12/11 07:01, Ankit Verma wrote:
>
> Hi Andy,
>
> Can u pls help me in creating a new web application from scratch.
> Secondly i am trying to import wordnet model but facing some error can u pls see
> the below error.

Your error is:

 > "java.io.FileNotFoundException: File not found on classpath:
 > wordnet_glossary-20010201.rdf"



>
> the code which i am using is
> package test;
>
> import java.io.*;
> import com.hp.hpl.jena.db.*;

This is deprecated.  It has been removed from jena 2.7.0.  Use TDB if 
you need to use a database at all.  SDB is also a possibility.

> import com.hp.hpl.jena.rdf.model.*;

> readFileIntoModel(WN_GLOSSARY, wordnetModel);

> private static void readFileIntoModel(String filename, Model model)
> throws FileNotFoundException {
>
> // Use the class loader to find the input file
> InputStream in =
> ImportWordnet.class.getClassLoader().getResourceAsStream(filename);
>
> if (in == null) {
> throw new FileNotFoundException("File not found on classpath: "+
> filename);
> }

Did you put the file on the classpath?  It appears not.

Why not simply read it from the filing system?

     FileManager.get().readModel(model, filename) ;



Andy