Re: [castor-dev] How do I marshall a collection of my class objects?

[Dr. Hartmut Kocher]

It looks like you forgot to set the Mapping object.
mm.setMapping(...);

If you don't do that, the marshaller doesn't really know how to handle
classes. You either should add a mapping file and set it, or use the source
generator to generate your java classes from an XML schema. The latter is at
least my preferred way of doing this.

Hope this helps
Dr. Hartmut Kocher
Leonberg
Germany


-----Ursprungliche Nachricht-----
Von: Mark A. Sellers [mailto:[EMAIL PROTECTED]]
Gesendet: Dienstag, 23. April 2002 19:44
An: [EMAIL PROTECTED]
Betreff: Re: [castor-dev] How do I marshall a collection of my class
objects?


I tried using the CVS version and still get an NPE exception. Here's what
I'm doing:

package rm.castor;

import java.util.Date;
import java.util.*;
import java.sql.Timestamp;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import org.exolab.castor.xml.*;
import TestObject;
import org.xml.sax.ContentHandler;
import org.apache.xml.serialize.*;

class Castor extends Frame {

        public Castor() {
                addWindowListener(new WindowAdapter() {
                        public void windowClosing(WindowEvent e) {
                                dispose();
                                System.exit(0);
                        }
                });
        }

        public static void main(String args[]) {
                System.out.println("Starting Castor...");
                Castor mainFrame = new Castor();
                mainFrame.setSize(400, 400);
                mainFrame.setTitle("Castor");
                mainFrame.setVisible(true);

    TestObject[] to = new TestObject[2];
    to[0] = new TestObject();
    to[0].setDateOfBirth(new java.util.Date("10/1/2001"));
    to[0].setName("Mark");
    to[1] = new TestObject();
    to[1].setDateOfBirth(new java.util.Date("12/21/1956"));
    to[1].setName("Sandy");

  try {
        FileWriter writer = new FileWriter("C:\\Castor\\cc.xml");
        Marshaller mm = new Marshaller(writer);
      mm.setNamespaceMapping("-//EXOLAB/Castor Object Mapping Schema Version
1.0//EN","http://castor.exolab.org/mapping.xsd";);
      mm.setMarshalAsDocument(true);
        mm.setValidation(false);
        mm.setNSPrefixAtRoot(true);

        mm.marshal(to, writer);

        System.err.println("finished marshalling...");

   } catch (java.io.IOException ioe) {
       System.err.println(ioe.toString());
   } catch ( org.exolab.castor.xml.MarshalException me ) {
        System.err.println(me.toString());
   } catch ( org.exolab.castor.xml.ValidationException ve ) {
        System.err.println(ve.toString());
   }
  }
}

Class TestObject:

import java.util.Date;
public class TestObject implements java.io.Serializable {
   private String name = null;
   private Date dob = null;

   public TestObject() {
      super();
   }

   public TestObject(String name) {
      this.name  = name;
   }

   public Date getDateOfBirth() {
      return dob;
   }

   public String getName() {
      return name;
   }

   public void setDateOfBirth(Date dob) {
      this.dob = dob;
   }

   public void setName(String name) {
      this.name = name;
   }
}

Exception in thread "main" java.lang.NullPointerException
        at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:672)
        at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:540)
        at org.exolab.castor.xml.Marshaller.marshal(Marshaller.java:460)
        at rm.castor.Castor.main(Castor.java:160)

Thanks, Mark Sellers

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