An XLM Question.. I hope this all right to ask here? I am new to Java. Thx

Question

Hi to all
I have an xml Question .
I find that if the nodes are not all filled in then i get the error
java.lang.NullPointerException
If all the nodes are filled in it runs fine. Why is this ? Am I missing somthing
Please if you can explane to what I am doing wrong
Thanks
Craig
this is the code to save.
void SavejButton_actionPerformed(ActionEvent e) {
    xmlDoc = new XMLDoc("EPOD_USER");
    try
      Node userConfig =  xmlDoc.addNode(xmlDoc.getRootNode(),"USER_CONFIGURATION");
      //Compant Infomation
      Node  company =xmlDoc.addNode(userConfig,"COMPANY_INFOMATION");
      xmlDoc.addNode(company,"COMPANY_NAME", SetupCompanyNameJText.getText());
      xmlDoc.addNode(company,"COMPANY_TYPE", (String) CompanyTypejComboBox.getSelectedItem());
      //Company Phones
      Node  contact =  xmlDoc.addNode(userConfig,"COMPANY_PHONES");
      xmlDoc.addNode(contact,"PHONE_1", SetupPhWork1jText.getText());
      xmlDoc.addNode(contact,"PHONE_2", SetupPhWork2JText.getText());
      xmlDoc.addNode(contact,"FAX", FaxjTextField.getText());
  xmlDoc.saveToFile("EPOD" +".xml");
    catch (IllegalNodeAddException inae)
      System.out.println(inae.getMessage());
    System.out.println(xmlDoc);
    //  System.out.println(xmlDoc);
  cancel();
  }Code to bring it back .
  public void setUserConfig(){
    xmlDoc = new XMLDoc();
    xmlDoc.loadFromFile("Epod.xml");
    try
      Node company = xmlDoc.getNode("/EPOD_USER/USER_CONFIGURATION/COMPANY_INFOMATION/");
      SetupCompanyNameJText.setText(xmlDoc.getValueOf(company,"COMPANY_NAME"));
      CompanyTypejComboBox.setSelectedItem(xmlDoc.getValueOf(company,"COMPANY_TYPE"));
      Node phone = xmlDoc.getNode("/EPOD_USER/USER_CONFIGURATION/COMPANY_PHONES/");
      SetupPhWork1jText.setText(xmlDoc.getValueOf(phone,"PHONE_1"));
      SetupPhWork2JText.setText(xmlDoc.getValueOf(phone,"PHONE_2"));
      FaxjTextField.setText(xmlDoc.getValueOf(phone,"FAX"));
    catch ( NodeNotFoundException nnfe)
      System.out.println(nnfe.getMessage());

Answer 1

java.lang.NullPointerException
You get a NullPointerException when an object isn't intialized or doesn't contain any data.
When one node isn't filled in the object that was linked to that doesn't get any data and remains un-intilized there for trowing an NullPointerException.
You might wanna change all the "nod.getText()" to like this:
if(SetupCompanyNameJText.getText()!=null) {
xmlDoc.addNode(company,"COMPANY_NAME", SetupCompanyNameJText.getText());
} else {
// some default value
}And do the same with the rest off them...
And to the catch part add change ti to this:
catch (IllegalNodeAddException inae)    {
System.out.println(inae.getMessage());   
} catch(NullPointerExcepton npe) {
System.out.println("NPE: " + npe.getMessage()); 
}That should make it all work =)
By the way this isn't an XML question....