*As I also mentioned in the code: model.write(), it writes the rdf to console and load the GUI also.* *But when I enter text and press button ,it gives exception error:*
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javaapplication4.NewJFrame.read(NewJFrame.java:53) at javaapplication4.NewJFrame.jButton3ActionPerformed(NewJFrame.java:287) at javaapplication4.NewJFrame.access$100(NewJFrame.java:27) at javaapplication4.NewJFrame$2.actionPerformed(NewJFrame.java:135) On Wed, Jul 13, 2016 at 2:27 PM, Andy Seaborne <a...@apache.org> wrote: > 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) >> >> >
