Problems with backing Java Code

Question

Earlier I manually deleted the processChange event handler method for a textfield from the backing java code. As I had no plans to use that event handler. Now my page abends with a message stating that the process chnage method is not available. I tried to add via the event handler for the textbox using the GUI but it does not add the process change event handler method. Using an another process change method as a model I manually entered the code to handle process change for the text bos. Now I am getting an internal server exception - Null in one of the parameters. PLEASE HELP. What are my options - Delete and re-create the entire page

Answer 1

Hi,
Yes I am using the recommeded code: The Text field generating the null exception is addDataSourceTF. Whenever we click on the addDataSourceBTN we get an Internal exception.
Thanks very much for looking into this problem. Any advice will be greatly appreciated.
<h:panelGrid binding="#{MainPage.gridPanel1}" cellpadding="3" cellspacing="2" columnClasses="" id="gridPanel1" style="background-color: rgb(204, 255, 204); left: 48px; top: 312px; position: absolute">
<h:inputText binding="#{MainPage.addDataSourceTF}" id="addDataSourceTF" style="font-family: Arial,Helvetica,sans-serif"
validator="#{MainPage.addDataSourceTF_validate}" valueChangeListener="#{MainPage.addDataSourceTF_processValueChange}"/>
<h:commandButton action="#{MainPage.addDataSourceBTN_action}" binding="#{MainPage.addDataSourceBTN}" id="addDataSourceBTN"
image="resources/button32.jpg" value="Add Data Source"/>
<h:selectOneMenu binding="#{MainPage.deleteDataSourceDD}" id="deleteDataSourceDD" immediate="true" onchange="this.form.submit();"
style="height: 23px; width: 164px" valueChangeListener="#{MainPage.deleteDataSourceDD_processValueChange}">
<f:selectItems binding="#{MainPage.dropdown1SelectItems}" id="dropdown1SelectItems" value="#{MainPage.database_infoRowSet.selectItems['DB_SRC,DB_SRC']}"/>
</h:selectOneMenu>
<h:commandButton action="#{MainPage.deleteDataSourceBTN_action}" binding="#{MainPage.deleteDataSourceBTN}" id="deleteDataSourceBTN"
image="resources/delete.jpg" value="Submit"/>
</h:panelGrid>
Backing Java Code:
* MainPage.java
* Created on December 15, 2004, 1:45 AM
* Copyright adear1
package dissertation;
import javax.faces.*;
import com.sun.jsfcl.app.*;
import javax.faces.component.html.*;
import com.sun.jsfcl.data.*;
import javax.faces.component.*;
import javax.faces.event.*;
import com.sun.sql.rowset.*;
import javax.faces.context.FacesContext;
import javax.faces.application.FacesMessage;
import javax.faces.convert.*;
import java.sql.*;
import javax.naming.*;
import javax.sql.DataSource;
import java.lang.*;
import javax.faces.context.*;
public class MainPage extends AbstractPageBean {
// <editor-fold defaultstate="collapsed" desc="Creator-managed Component Definition">
private int __placeholder;
private HtmlForm form1 = new HtmlForm();
public HtmlForm getForm1() {
return form1;
public void setForm1(HtmlForm hf) {
this.form1 = hf;
private HtmlCommandButton addDataSourceBTN = new HtmlCommandButton();
public HtmlCommandButton getAddDataSourceBTN() {
return addDataSourceBTN;
public void setAddDataSourceBTN(HtmlCommandButton hcb) {
this.addDataSourceBTN = hcb;
private HtmlCommandButton searchDataBTN = new HtmlCommandButton();
public HtmlCommandButton getSearchDataBTN() {
return searchDataBTN;
public void setSearchDataBTN(HtmlCommandButton hcb) {
this.searchDataBTN = hcb;
private HtmlCommandButton scrubbingRulesBTN = new HtmlCommandButton();
public HtmlCommandButton getScrubbingRulesBTN() {
return scrubbingRulesBTN;
public void setScrubbingRulesBTN(HtmlCommandButton hcb) {
this.scrubbingRulesBTN = hcb;
private HtmlCommandButton scrubDataSourceBTN = new HtmlCommandButton();
public HtmlCommandButton getScrubDataSourceBTN() {
return scrubDataSourceBTN;
public void setScrubDataSourceBTN(HtmlCommandButton hcb) {
this.scrubDataSourceBTN = hcb;
private HtmlCommandButton uploadDataSourceBTN = new HtmlCommandButton();
public HtmlCommandButton getUploadDataSourceBTN() {
return uploadDataSourceBTN;
public void setUploadDataSourceBTN(HtmlCommandButton hcb) {
this.uploadDataSourceBTN = hcb;
private HtmlCommandButton deleteDataSourceBTN = new HtmlCommandButton();
public HtmlCommandButton getDeleteDataSourceBTN() {
return deleteDataSourceBTN;
public void setDeleteDataSourceBTN(HtmlCommandButton hcb) {
this.deleteDataSourceBTN = hcb;
private HtmlInputText addDataSourceTF = new HtmlInputText();
public HtmlInputText getAddDataSourceTF() {
return addDataSourceTF;
public void setAddDataSourceTF(HtmlInputText hit) {
this.addDataSourceTF = hit;
private HtmlSelectOneMenu deleteDataSourceDD = new HtmlSelectOneMenu();
public HtmlSelectOneMenu getDeleteDataSourceDD() {
return deleteDataSourceDD;
public void setDeleteDataSourceDD(HtmlSelectOneMenu hsom) {
this.deleteDataSourceDD = hsom;
private DefaultSelectItemsArray dropdown1DefaultItems = new DefaultSelectItemsArray();
public DefaultSelectItemsArray getDropdown1DefaultItems() {
return dropdown1DefaultItems;
public void setDropdown1DefaultItems(DefaultSelectItemsArray dsia) {
this.dropdown1DefaultItems = dsia;
private UISelectItems dropdown1SelectItems = new UISelectItems();
public UISelectItems getDropdown1SelectItems() {
return dropdown1SelectItems;
public void setDropdown1SelectItems(UISelectItems uisi) {
this.dropdown1SelectItems = uisi;
private HtmlPanelGrid gridPanel1 = new HtmlPanelGrid();
public HtmlPanelGrid getGridPanel1() {
return gridPanel1;
public void setGridPanel1(HtmlPanelGrid hpg) {
this.gridPanel1 = hpg;
private HtmlPanelGrid gridPanel2 = new HtmlPanelGrid();
public HtmlPanelGrid getGridPanel2() {
return gridPanel2;
public void setGridPanel2(HtmlPanelGrid hpg) {
this.gridPanel2 = hpg;
private HtmlOutputText welcomeOT = new HtmlOutputText();
public HtmlOutputText getWelcomeOT() {
return welcomeOT;
public void setWelcomeOT(HtmlOutputText hot) {
this.welcomeOT = hot;
private JdbcRowSetXImpl database_infoRowSet = new JdbcRowSetXImpl();
public JdbcRowSetXImpl getDatabase_infoRowSet() {
return database_infoRowSet;
public void setDatabase_infoRowSet(JdbcRowSetXImpl jrsxi) {
this.database_infoRowSet = jrsxi;
private DefaultSelectItemsArray listbox1DefaultItems1 = new DefaultSelectItemsArray();
public DefaultSelectItemsArray getListbox1DefaultItems1() {
return listbox1DefaultItems1;
public void setListbox1DefaultItems1(DefaultSelectItemsArray dsia) {
this.listbox1DefaultItems1 = dsia;
private HtmlSelectOneListbox dataSourceLB = new HtmlSelectOneListbox();
public HtmlSelectOneListbox getDataSourceLB() {
return dataSourceLB;
public void setDataSourceLB(HtmlSelectOneListbox hsol) {
this.dataSourceLB = hsol;
private DefaultSelectItemsArray listbox1DefaultItems2 = new DefaultSelectItemsArray();
public DefaultSelectItemsArray getListbox1DefaultItems2() {
return listbox1DefaultItems2;
public void setListbox1DefaultItems2(DefaultSelectItemsArray dsia) {
this.listbox1DefaultItems2 = dsia;
private UISelectItems listbox1SelectItems = new UISelectItems();
public UISelectItems getListbox1SelectItems() {
return listbox1SelectItems;
public void setListbox1SelectItems(UISelectItems uisi) {
this.listbox1SelectItems = uisi;
private JdbcRowSetXImpl database_infoRowSet1 = new JdbcRowSetXImpl();
public JdbcRowSetXImpl getDatabase_infoRowSet1() {
return database_infoRowSet1;
public void setDatabase_infoRowSet1(JdbcRowSetXImpl jrsxi) {
this.database_infoRowSet1 = jrsxi;
private JdbcRowSetXImpl user_tableRowSet = new JdbcRowSetXImpl();
public JdbcRowSetXImpl getUser_tableRowSet() {
return user_tableRowSet;
public void setUser_tableRowSet(JdbcRowSetXImpl jrsxi) {
this.user_tableRowSet = jrsxi;
private HtmlMessages messageList1 = new HtmlMessages();
public HtmlMessages getMessageList1() {
return messageList1;
public void setMessageList1(HtmlMessages hm) {
this.messageList1 = hm;
private HtmlOutputText welcomeOT1 = new HtmlOutputText();
public HtmlOutputText getWelcomeOT1() {
return welcomeOT1;
public void setWelcomeOT1(HtmlOutputText hot) {
this.welcomeOT1 = hot;
// </editor-fold>
public MainPage() {
// <editor-fold defaultstate="collapsed" desc="Creator-managed Component Initialization">
try {
database_infoRowSet.setDataSourceName("java:comp/env/jdbc/mySQL");
database_infoRowSet.setCommand("SELECT ALL database_info.DB_SRC, database_info.USER_ID FROM database_info WHERE database_info.USER_ID = ?");
database_infoRowSet1.setDataSourceName("java:comp/env/jdbc/mySQL");
database_infoRowSet1.setCommand("SELECT ALL database_info.DB_SRC, database_info.DB_URL, database_info.DB_SCHEMA, database_info.DB_TYPE, database_info.USER_ID FROM database_info WHERE database_info.USER_ID = ?");
user_tableRowSet.setDataSourceName("java:comp/env/jdbc/mySQL");
user_tableRowSet.setCommand("SELECT * FROM user_table");
} catch (Exception e) {
log("MainPage Initialization Failure", e);
throw e instanceof javax.faces.FacesException ? (FacesException) e: new FacesException(e);
// </editor-fold>
// Additional user provided initialization code
try{
database_infoRowSet.setString(1, getSessionBean1().getSbUserID());
database_infoRowSet1.setString(1, getSessionBean1().getSbUserID());
database_infoRowSet.execute();
database_infoRowSet1.execute();
database_infoRowSet1.first();
if (database_infoRowSet.next()) {
// If no row found then make the following button's as readonly
database_infoRowSet.first();
else {
FacesContext fc =
javax.faces.context.FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage(
"Please Add Data Source to Begin Processing", ""));
searchDataBTN.setDisabled(true);
scrubbingRulesBTN.setDisabled(true);
scrubDataSourceBTN.setDisabled(true);
uploadDataSourceBTN.setDisabled(true);
catch (Exception ex){
log("Error in initializing database_info Row Set", ex);
protected dissertation.ApplicationBean1 getApplicationBean1() {
return (dissertation.ApplicationBean1)getBean("ApplicationBean1");
protected dissertation.SessionBean1 getSessionBean1() {
return (dissertation.SessionBean1)getBean("SessionBean1");
* Bean cleanup.
protected void afterRenderResponse() {
user_tableRowSet.close();
database_infoRowSet1.close();
database_infoRowSet.close();
public String searchDataBTN_action() {
// TODO Following code was replaced by static navigation
// TODO Replace with your code
//if no value selected then we prompt them to select a row
if (dataSourceLB.getValue().equals("")||dataSourceLB.getValue()== null){
// return error msg to select a row before continuing
FacesContext fc =
javax.faces.context.FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage("Please select a data source to process", ""));
return null;
else {
// call method to retrieve the db_schema from the
getDbDetails();
getDbDriver();
return "searchcriticaldata";
public String scrubbingRulesBTN_action() {
// TODO Replace with your code
if (dataSourceLB.getValue().equals("")||dataSourceLB.getValue()== null){
// return error msg to select a row before continuing
FacesContext fc =
javax.faces.context.FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage("Please select a data source to process", ""));
return null;
else {
// call method to retrieve the db_schema from the
getDbDetails();
getDbDriver();
return "definecolumnrules";
public String scrubDataSourceBTN_action() {
// TODO Replace with your code
if (dataSourceLB.getValue().equals("")||dataSourceLB.getValue()== null){
// return error msg to select a row before continuing
FacesContext fc =
javax.faces.context.FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage("Please select a data source to process", ""));
return null;
else {
// call method to retrieve the db_schema from the
getDbDetails();
getDbDriver();
return "scrubdata";
public String uploadDataSourceBTN_action() {
// TODO Replace with your code
if (dataSourceLB.getValue().equals("")||dataSourceLB.getValue()== null){
// return error msg to select a row before continuing
FacesContext fc =
javax.faces.context.FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage("Please select a data source to process", ""));
return null;
else {
// call method to retrieve the db_schema from the
getDbDetails();
getDbDriver();
return "uploaddata";
public String addDataSourceBTN_action() {
// TODO Following code was replaced by static navigation
if ( false) {
// TODO Replace with your code
if (addDataSourceTF.getValue().equals("")){
FacesContext fc =
javax.faces.context.FacesContext.getCurrentInstance();
fc.addMessage(null, new FacesMessage(
"Please specify Data Source to Add", ""));
return null;
else {
String woSpaces = ((String)addDataSourceTF.getValue()).replace(' ', '_');
getSessionBean1().setSbDataSrc(woSpaces);
return "adddatasrc";
return "adddatasrc";
public void getDbDetails(){
try {
Context ctx = new InitialContext();
if (ctx == null) throw new NamingException("No Initial Context");
DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/mySQL");
if (ds == null) throw new NamingException("No Data Source mySQL");
Connection conn = ds.getConnection();
if (conn == null)
throw new SQLException("Unable to establish connection");
String sql = "Select db_src, db_url, db_schema, db_type user_id, src_password from database_info where db_src=?";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, (String) dataSourceLB.getValue());
ResultSet rs = pstmt.executeQuery();
if (rs.next()){
getSessionBean1().setSbDataSrc(rs.getString("db_src"));
getSessionBean1().setSbDb_Schema(rs.getString("db_schema"));
getSessionBean1().setSbDb_Type(rs.getString("db_type"));
getSessionBean1().setSbDb_Userid(rs.getString("user_id"));
getSessionBean1().setSbDb_Password(rs.getString("src_password"));
else
java.lang.System.out.println("DB_Schema not found for db_src " +
(String) dataSourceLB.getValue());
rs.close();
pstmt.close();
conn.close();
catch (SQLException ex) {
java.lang.System.out.println("\n ----- SQL Exception caught ------\n");
while (ex !=null){
java.lang.System.out.println("Message: " + ex.getMessage());
java.lang.System.out.println("SQLState: " + ex.getSQLState());
java.lang.System.out.println("ErrorCode: " + ex.getErrorCode());
ex = ex.getNextException();
java.lang.System.out.println("");
catch (NamingException e){
java.lang.System.out.println("messge unable to establish context in changepassword.jsp");
public void getDbDriver(){
try {
Context ctx = new InitialContext();
if (ctx == null) throw new NamingException("No Initial Context");
DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/mySQL");
if (ds == null) throw new NamingException("No Data Source mySQL");
Connection conn = ds.getConnection();
if (conn == null)
throw new SQLException("Unable to establish connection");
String sql = "Select db_driver from database_type where db_type=?";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, getSessionBean1().getSbDb_Type());
ResultSet rs = pstmt.executeQuery();
if (rs.next()){
getSessionBean1().setSbDb_Driver(rs.getString("db_driver"));
else
java.lang.System.out.println("DB_Driver not found for db_src " +
(String) dataSourceLB.getValue());
rs.close();
pstmt.close();
conn.close();
catch (SQLException ex) {
java.lang.System.out.println("\n ----- SQL Exception caught ------\n");
while (ex !=null){
java.lang.System.out.println("Message: " + ex.getMessage());
java.lang.System.out.println("SQLState: " + ex.getSQLState());
java.lang.System.out.println("ErrorCode: " + ex.getErrorCode());
ex = ex.getNextException();
java.lang.System.out.println("");
catch (NamingException e){
java.lang.System.out.println("messge unable to establish context in changepassword.jsp");
public String deleteDataSourceBTN_action() {
// TODO Replace with your code
try {
Context ctx = new InitialContext();
if (ctx == null) throw new NamingException("No Initial Context");
DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/mySQL");
if (ds == null) throw new NamingException("No Data Source mySQL");
Connection conn = ds.getConnection();
if (conn == null)
throw new SQLException("Unable to establish connection");
String sql = "Delete from database_info where db_src=?";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, (String) deleteDataSourceDD.getValue());
pstmt.executeUpdate();
pstmt.close();
conn.close();
return "success";
catch (SQLException ex) {
java.lang.System.out.println("\n ----- SQL Exception caught ------\n");
while (ex !=null){
java.lang.System.out.println("Message: " + ex.getMessage());
java.lang.System.out.println("SQLState: " + ex.getSQLState());
java.lang.System.out.println("ErrorCode: " + ex.getErrorCode());
ex = ex.getNextException();
java.lang.System.out.println("");
return "failure";
catch (NamingException e){
java.lang.System.out.println("messge unable to establish context in changepassword.jsp");
return "failure";
public void addDataSourceTF_processValueChange(ValueChangeEvent vce) {
// TODO Replace with your code
public void deleteDataSourceDD_processValueChange(ValueChangeEvent vce) {
// TODO Replace with your code
public void addDataSourceTF_validate(FacesContext fc, UIComponent uic, Object o) {
// TODO Replace with your code
}