companyVec = _safetyDatabase.getCompanyList();
		 for (int i = 0; i < companyVec.size(); i++) {
			_CompanyList.addItem(companyVec.elementAt(i).toString());
		}
		_CompanyList.addActionListener (new ActionListener () {
			public void actionPerformed(ActionEvent e) {
				if (_CompanyList.getSelectedIndex() > 0) {
					_RespUsersList.removeAllItems();
					respUsersVec = _safetyDatabase.getRespUsersList(_CompanyList.getSelectedItem().toString());
					for (int i = 0; i < respUsersVec.size(); i++) {
						_RespUsersList.addItem(respUsersVec.elementAt(i).toString());
					}

				}

			}
	    });	

		_RespUsersList.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent e) {
				 RespPersonID = _RespUsersList.getSelectedIndex() + 1;
			     RespPersonName = _RespUsersList.getSelectedItem().toString();
	        }
	    });

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at SafetyInspectionRegister.AddSafetyDialog$1.itemStateChanged(AddSafetyDialog.java:217)
	at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)
	at javax.swing.JComboBox.selectedItemChanged(Unknown Source)
	at javax.swing.JComboBox.contentsChanged(Unknown Source)
	at javax.swing.JComboBox.intervalRemoved(Unknown Source)
	at javax.swing.AbstractListModel.fireIntervalRemoved(Unknown Source)
	at javax.swing.DefaultComboBoxModel.removeAllElements(Unknown Source)
	at javax.swing.JComboBox.removeAllItems(Unknown Source)
	at SafetyInspectionRegister.AddSafetyDialog$2.actionPerformed(AddSafetyDialog.java:228)
	at javax.swing.JComboBox.fireActionEvent(Unknown Source)
	at javax.swing.JComboBox.setSelectedItem(Unknown Source)
	at javax.swing.JComboBox.setSelectedIndex(Unknown Source)
	at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(Unknown Source)
	at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
....