This looks rather similar to ; http://stackoverflow.com/questions/38351713/creating-individual-in-jena
I suggest local collaboration. On 13/07/16 16:37, kumar rohit wrote:
Hi I have the following code in which I want to create an instance/individual of the class Student. The student name is entered in a text box (in a button even handler). But it gives exception. _________________________________________ public class NewJFrame extends javax.swing.JFrame { public static void readOntology( String file, OntModel model ) { InputStream in = null; try { in = new FileInputStream( file ); model.read(in, "RDF/XML"); in.close(); } catch (IOException e) { e.printStackTrace(); } My main() is the following. ________________________________ public static void main(String args[]) { OntModel model = ModelFactory.createOntologyModel(); String file="D://std.owl"; readOntology(file , model ); _______________________________________ Button handler to get student name from text box is: private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { String str=jTextField1.getText(); read(str, null); } _____________________________________ WARN [main] (RDFDefaultErrorHandler.java:36) - unknown-source: {W136} Relative URIs are not permitted in RDF: specifically <RDF/XML> Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javaapplication4.NewJFrame.read(NewJFrame.java:50) at javaapplication4.NewJFrame.jButton2ActionPerformed(NewJFrame.java:266) at javaapplication4.NewJFrame.access$000(NewJFrame.java:27) at javaapplication4.NewJFrame$1.actionPerformed(NewJFrame.java:103) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)