This is a Java issue, not to do with Jena itself:
> Caused by: java.lang.ClassNotFoundException:
> com.hp.hpl.jena.rdf.model.ModelFact
> ory
http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/ClassNotFoundException.html
> java RdRDF
You have not set the classpath by the look of it.
Either set the classpath or run inside Eclipse or other IDE which will
do it for you when you set the project up correctly.
Andy
On 25/03/12 15:46, vijayalakshmi wrote:
The problem I initially told was a part of the entire idea.
Here is what I require.
I want to write a java program that should look through all the RDF files
in a given folder. The java program is given a string as input.
The program has to look for the value of<RDF.subject> element in each of
the RDF file to see if the value matches with the given input string. If
there is a match, then the value of the<RDF.object> should be obtained and
stored in a string array.
The following is my java code.
import java.io.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import com.hp.hp> Caused by: java.lang.ClassNotFoundException:
com.hp.hpl.jena.rdf.model.ModelFact
oryl.jena.rdf.model.*;
import com.hp.hpl.jena.vocabulary.*;
import com.hp.hpl.jena.util.FileManager;
public class RdRDF extends Object
{
public static void main(String args[])
{
try
{
// create an empty model
Model model = ModelFactory.createDefaultModel();
//look at all the files in the folder
String path = "C:\\Program Files\\Apache Software Foundation\\Tomcat
6.0\\webapps\\MyFiles\\WEB-INF\\classes\\";
String files;
File folder = new File(path);
File[] listOfFiles = folder.listFiles();
for (int i = 0; i< listOfFiles.length; i++)
{
if (listOfFiles[i].isFile())
{
files = listOfFiles[i].getName();
if (files.endsWith(".rdf"))
{
model.read(files, null);
//read the domain
System.out.println(files + "\t");
Resource vcard = model.getResource("http://www.wordpress.com/blogs/"; +
files);
String domain = vcard.getProperty(RDF.subject).getString();
System.out.println(domain + "\n");
}
}
}
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
When I run this code,
I get the following error.
C:\Program Files\Apache Software Foundation\Tomcat
6.0\webapps\MyFiles\WEB-INF\c
lasses>java RdRDF
Exception in thread "main" java.lang.NoClassDefFoundError:
com/hp/hpl/jena/rdf/m
odel/ModelFactory
at RdRDF.main(RdRDF.java:18)
Caused by: java.lang.ClassNotFoundException:
com.hp.hpl.jena.rdf.model.ModelFact
ory
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
C:\Program Files\Apache Software Foundation\Tomcat
6.0\webapps\MyFiles\WEB-INF\c
lasses>
Please tell me what mistake I have done.
