Data Table will not bind to Dropdown List selection

Question

I get the following error when I try to use my own database tables (As in the "Using Databound Components to Access Databases" tutorial). It is a Oracle9i database. The Table (Vehicle)I use to populate the Dropdown List has around 450 000 rows, and the ComponentRowset returns 362 000 rows when run without a parameter.
Exception Details: javax.faces.el.EvaluationException
java.lang.NullPointerException
Possible Source of Error:
Class Name: com.sun.faces.el.ValueBindingImpl
File Name: ValueBindingImpl.java
Method Name: getValue
Line Number: 206
Please help! What am I doing wrong? As far as I can see the code is identical to the "Using Databound Components to Access Databases" tutorial.
Here is the code:
* Page1.java
* Created on 12 October 2004, 05:56
* Copyright jgenis
package ucodapp;
import javax.faces.*;
import com.sun.jsfcl.app.*;
import javax.faces.component.html.*;
import com.sun.jsfcl.data.*;
import javax.faces.component.*;
import com.sun.sql.rowset.*;
import javax.faces.event.*;
import javax.faces.convert.*;
public class Page1 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 HtmlDataTable dataTable1 = new HtmlDataTable();
    public HtmlDataTable getDataTable1() {
        return dataTable1;
    public void setDataTable1(HtmlDataTable hdt) {
        this.dataTable1 = hdt;
    private JdbcRowSetXImpl componentRowSet = new JdbcRowSetXImpl();
    public JdbcRowSetXImpl getComponentRowSet() {
        return componentRowSet;
    public void setComponentRowSet(JdbcRowSetXImpl jrsxi) {
        this.componentRowSet = jrsxi;
    private HtmlOutputLabel componentLabel1 = new HtmlOutputLabel();
    public HtmlOutputLabel getComponentLabel1() {
        return componentLabel1;
    public void setComponentLabel1(HtmlOutputLabel hol) {
        this.componentLabel1 = hol;
    private HtmlOutputText componentLabel1Text = new HtmlOutputText();
    public HtmlOutputText getComponentLabel1Text() {
        return componentLabel1Text;
    public void setComponentLabel1Text(HtmlOutputText hot) {
        this.componentLabel1Text = hot;
    private UIColumn column1 = new UIColumn();
    public UIColumn getColumn1() {
        return column1;
    public void setColumn1(UIColumn uic) {
        this.column1 = uic;
    private HtmlOutputText outputText1 = new HtmlOutputText();
    public HtmlOutputText getOutputText1() {
        return outputText1;
    public void setOutputText1(HtmlOutputText hot) {
        this.outputText1 = hot;
    private HtmlOutputText outputText2 = new HtmlOutputText();
    public HtmlOutputText getOutputText2() {
        return outputText2;
    public void setOutputText2(HtmlOutputText hot) {
        this.outputText2 = hot;
    private UIColumn column2 = new UIColumn();
    public UIColumn getColumn2() {
        return column2;
    public void setColumn2(UIColumn uic) {
        this.column2 = uic;
    private HtmlOutputText outputText3 = new HtmlOutputText();
    public HtmlOutputText getOutputText3() {
        return outputText3;
    public void setOutputText3(HtmlOutputText hot) {
        this.outputText3 = hot;
    private HtmlOutputText outputText4 = new HtmlOutputText();
    public HtmlOutputText getOutputText4() {
        return outputText4;
    public void setOutputText4(HtmlOutputText hot) {
        this.outputText4 = hot;
    private UIColumn column3 = new UIColumn();
    public UIColumn getColumn3() {
        return column3;
    public void setColumn3(UIColumn uic) {
        this.column3 = uic;
    private HtmlOutputText outputText5 = new HtmlOutputText();
    public HtmlOutputText getOutputText5() {
        return outputText5;
    public void setOutputText5(HtmlOutputText hot) {
        this.outputText5 = hot;
    private HtmlOutputText outputText6 = new HtmlOutputText();
    public HtmlOutputText getOutputText6() {
        return outputText6;
    public void setOutputText6(HtmlOutputText hot) {
        this.outputText6 = hot;
    private UIColumn column4 = new UIColumn();
    public UIColumn getColumn4() {
        return column4;
    public void setColumn4(UIColumn uic) {
        this.column4 = uic;
    private HtmlOutputText outputText7 = new HtmlOutputText();
    public HtmlOutputText getOutputText7() {
        return outputText7;
    public void setOutputText7(HtmlOutputText hot) {
        this.outputText7 = hot;
    private HtmlOutputText outputText8 = new HtmlOutputText();
    public HtmlOutputText getOutputText8() {
        return outputText8;
    public void setOutputText8(HtmlOutputText hot) {
        this.outputText8 = hot;
    private UIColumn column5 = new UIColumn();
    public UIColumn getColumn5() {
        return column5;
    public void setColumn5(UIColumn uic) {
        this.column5 = uic;
    private HtmlOutputText outputText9 = new HtmlOutputText();
    public HtmlOutputText getOutputText9() {
        return outputText9;
    public void setOutputText9(HtmlOutputText hot) {
        this.outputText9 = hot;
    private HtmlOutputText outputText10 = new HtmlOutputText();
    public HtmlOutputText getOutputText10() {
        return outputText10;
    public void setOutputText10(HtmlOutputText hot) {
        this.outputText10 = hot;
    private UIColumn column6 = new UIColumn();
    public UIColumn getColumn6() {
        return column6;
    public void setColumn6(UIColumn uic) {
        this.column6 = uic;
    private HtmlOutputText outputText11 = new HtmlOutputText();
    public HtmlOutputText getOutputText11() {
        return outputText11;
    public void setOutputText11(HtmlOutputText hot) {
        this.outputText11 = hot;
    private HtmlOutputText outputText12 = new HtmlOutputText();
    public HtmlOutputText getOutputText12() {
        return outputText12;
    public void setOutputText12(HtmlOutputText hot) {
        this.outputText12 = hot;
    private UIColumn column7 = new UIColumn();
    public UIColumn getColumn7() {
        return column7;
    public void setColumn7(UIColumn uic) {
        this.column7 = uic;
    private HtmlOutputText outputText13 = new HtmlOutputText();
    public HtmlOutputText getOutputText13() {
        return outputText13;
    public void setOutputText13(HtmlOutputText hot) {
        this.outputText13 = hot;
    private HtmlOutputText outputText14 = new HtmlOutputText();
    public HtmlOutputText getOutputText14() {
        return outputText14;
    public void setOutputText14(HtmlOutputText hot) {
        this.outputText14 = hot;
    private RowSetDataModel dataTable1Model = new RowSetDataModel();
    public RowSetDataModel getDataTable1Model() {
        return dataTable1Model;
    public void setDataTable1Model(RowSetDataModel rsdm) {
        this.dataTable1Model = rsdm;
    private HtmlSelectOneMenu dropdown1 = new HtmlSelectOneMenu();
    public HtmlSelectOneMenu getDropdown1() {
        return dropdown1;
    public void setDropdown1(HtmlSelectOneMenu hsom) {
        this.dropdown1 = hsom;
    private UISelectItems dropdown1SelectItems = new UISelectItems();
    public UISelectItems getDropdown1SelectItems() {
        return dropdown1SelectItems;
    public void setDropdown1SelectItems(UISelectItems uisi) {
        this.dropdown1SelectItems = uisi;
    private JdbcRowSetXImpl vehicleRowSet = new JdbcRowSetXImpl();
    public JdbcRowSetXImpl getVehicleRowSet() {
        return vehicleRowSet;
    public void setVehicleRowSet(JdbcRowSetXImpl jrsxi) {
        this.vehicleRowSet = jrsxi;
    private BigDecimalConverter dropdown1Converter = new BigDecimalConverter();
    public BigDecimalConverter getDropdown1Converter() {
        return dropdown1Converter;
    public void setDropdown1Converter(BigDecimalConverter bdc) {
        this.dropdown1Converter = bdc;
    // </editor-fold>
    public Page1() {
        // <editor-fold defaultstate="collapsed" desc="Creator-managed Component Initialization">
        try {
            componentRowSet.setDataSourceName("java:comp/env/jdbc/CDS");
            componentRowSet.setCommand("SELECT ALL TRACKER.COMPONENT.PINNO, TRACKER.COMPONENT.UNITCODE, TRACKER.COMPONENT.INSTALLEDDATE, TRACKER.COMPONENT.INSTALLREPORTNO, TRACKER.COMPONENT.TNUSERIALNO, TRACKER.VEHICLE.REGNO, TRACKER.VEHICLE.VINNO, TRACKER.VEHICLE.VEHICLEID, TRACKER.TRACKERAGREEMENT.TAID, TRACKER.TAPRODUCT.TAPRODUCTID, TRACKER.COMPONENT.COMPONENTID, TRACKER.COMPONENT.TAPRODUCTID, TRACKER.COMPONENT.COMPONENTTYPEID, TRACKER.COMPONENT.INSTALLERID, TRACKER.TAPRODUCT.TAID, TRACKER.TAPRODUCT.PRODUCTTYPEID, TRACKER.TAPRODUCT.TAPRODUCTSTATUSID, TRACKER.TAPRODUCT.PRORATANRDAYS, TRACKER.TAPRODUCT.CONTRACTPERIOD, TRACKER.TAPRODUCT.BILLINGFREQUENCYID, TRACKER.TAPRODUCT.CANCELLATIONDATE, TRACKER.TAPRODUCT.STARTDATE, TRACKER.TAPRODUCT.SOURCEID, TRACKER.TAPRODUCT.PRICINGDATE, TRACKER.TAPRODUCT.DEALTYPEID, TRACKER.TAPRODUCT.ACTIONTYPEID, TRACKER.TAPRODUCT.ISSTANDARDBATTERY, TRACKER.TAPRODUCT.AUDITUSERID, TRACKER.TAPRODUCT.AUDITSRID, TRACKER.COMPONENT.SERIALNUMBER, TRACKER.COMPONENT.RECEIVEDDATE, TRACKER.COMPONENT.RESPONSECODE, TRACKER.COMPONENT.REPLYCODE, TRACKER.COMPONENT.ACTIVATIONCODE, TRACKER.COMPONENT.ALERT, TRACKER.COMPONENT.ALTDEACTIVATIONCODE, TRACKER.COMPONENT.INSTALLEDLOCATION, TRACKER.COMPONENT.VERSION, TRACKER.COMPONENT.SOFTWAREVERSION, TRACKER.COMPONENT.CANACTIVATE, TRACKER.COMPONENT.COMPONENTSTATUSID, TRACKER.COMPONENT.SIMNO, TRACKER.COMPONENT.LOCATECELLNO, TRACKER.COMPONENT.AUDITDT, TRACKER.COMPONENT.THEFTNO, TRACKER.TAPRODUCT.STATUSBEFORECANCELLATION, TRACKER.TAPRODUCT.AUDITDT, TRACKER.TRACKERAGREEMENT.VEHICLEID, TRACKER.TRACKERAGREEMENT.CUSTOMERID, TRACKER.TRACKERAGREEMENT.TASTATUSDATE, TRACKER.TRACKERAGREEMENT.TASTATUSID, TRACKER.TRACKERAGREEMENT.AUDITUSERID, TRACKER.TRACKERAGREEMENT.AUDITSRID, TRACKER.TRACKERAGREEMENT.AUDITDT, TRACKER.VEHICLE.MAKEMODELID, TRACKER.VEHICLE.VEHICLECOLOURID, TRACKER.VEHICLE.COLOURSHADEID, TRACKER.VEHICLE.BATTERYID, TRACKER.VEHICLE.INSURERID, TRACKER.VEHICLE.ENGINENO, TRACKER.VEHICLE.CHASSISNO, TRACKER.VEHICLE.POLICYNO, TRACKER.VEHICLE.YEARMODEL, TRACKER.VEHICLE.JOINDATE, TRACKER.VEHICLE.POLICYCOMMENCEDATE, TRACKER.VEHICLE.DESCRIPTION, TRACKER.VEHICLE.ACTIVE, TRACKER.VEHICLE.METALLICIND, TRACKER.VEHICLE.TEMPREGNO, TRACKER.VEHICLE.ORDERNUMBER, TRACKER.VEHICLE.POLICYSEQUENCENO, TRACKER.VEHICLE.AUDITUSERID, TRACKER.VEHICLE.AUDITSRID, TRACKER.VEHICLE.AUDITDT, TRACKER.VEHICLE.THEFTNO  FROM TRACKER.COMPONENT INNER JOIN TRACKER.TAPRODUCT ON TRACKER.COMPONENT.TAPRODUCTID=TRACKER.TAPRODUCT.TAPRODUCTID INNER JOIN TRACKER.TRACKERAGREEMENT ON TRACKER.TAPRODUCT.TAID=TRACKER.TRACKERAGREEMENT.TAID INNER JOIN TRACKER.VEHICLE ON TRACKER.TRACKERAGREEMENT.VEHICLEID=TRACKER.VEHICLE.VEHICLEID WHERE TRACKER.VEHICLE.VEHICLEID=?");
            dataTable1Model.setDataCacheKey("com.sun.datacache.Page1.componentRowSet");
            dataTable1Model.setRowSet(componentRowSet);
            dataTable1Model.setSchemaName("");
            dataTable1Model.setTableName("");
            vehicleRowSet.setDataSourceName("java:comp/env/jdbc/CDS");
            vehicleRowSet.setCommand("SELECT ALL TRACKER.VEHICLE.VEHICLEID, TRACKER.VEHICLE.REGNO  FROM TRACKER.VEHICLE");
            vehicleRowSet.setFetchSize(1000);
        } catch (Exception e) {
            log("Page1 Initialization Failure", e);
            throw e instanceof javax.faces.FacesException ? (FacesException) e : new FacesException(e);
        // </editor-fold>
        // Additional user provided initialization code
        // Initialization Code
        // Part of the Using Databound Components to Access Databases Tutorial
        // You can find this tutorial on the web -- use the link on the Welcome page
        try {
            vehicleRowSet.execute();
            vehicleRowSet.next();
            dataTable1Model.setObject(1, vehicleRowSet.getObject("VEHICLEID"));
        } catch (Exception ex) {
            throw new FacesException(ex);
        } // end try catch
    protected ucodapp.ApplicationBean1 getApplicationBean1() {
        return (ucodapp.ApplicationBean1)getBean("ApplicationBean1");
    protected ucodapp.SessionBean1 getSessionBean1() {
        return (ucodapp.SessionBean1)getBean("SessionBean1");
     * Bean cleanup.
    protected void afterRenderResponse() {
        vehicleRowSet.close();
        vehicleRowSet.close();
        componentRowSet.close();
    public void dropdown1_processValueChange(ValueChangeEvent vce) {
        // Dropdown List Event Code
        // Part of the Using Databound Components to Access Databases Tutorial
        // You can find this tutorial on the web -- use the link on the Welcome page
        try {
            dataTable1Model.setObject(1, dropdown1.getValue());
            dataTable1Model.execute();
        } catch (Exception e) {
            log("vehicle id change exception", e);
            error("Exception changing Vehicle Id: " + e);
        } // end try catch
        // User event code here...

Answer 1

Take a look at the Page1 constructor.
It appears that you're trying to bind the datatable to 2
different rowsets. I suggest to clean up this
constructor to make sure you're using the right
rowset.
Your value binding expressions on each column
of the datatable may not be set to the right column.
John
JSC QA