Conversion Error setting value ''{0}'' for ''{1}''

Question

Hi
I have to populate a drop-down list on my page with the values coming from the DB.
JSF code:
<td align="right"><div id="wait" style="visibility:hidden;">Select an existing Application</div></td>
<td align="left"><div id="wait1" style="visibility:hidden;" >
<h:selectOneMenu id="exist" value="#{processApplication.selectedOwner}" styleClass="selectOneMenu">
<f:selectItems value="#{processApplication.existingOwners}"></f:selectItems>
</h:selectOneMenu>
</div>
</td>
processApplication bean:
public List<SelectItem> getExistingOwners() {                    
//existingOwners = this.getOwners();
try{
     List < SelectItem > existingOwners = new ArrayList < SelectItem > ( ) ;
     SelectItem si_0 = new SelectItem();
     SelectItem si_1 = new SelectItem();
SelectItem si_2 = new SelectItem();
     si_0.setValue("11");
     si_0.setLabel("sri");
     si_1.setValue("21");
     si_1.setLabel("ADAMS");
     existingOwners.add(si_0);
     existingOwners.add(si_1);
     logger.info("values in the list" +existingOwners.get(1).getValue());
          }catch(Exception e){
               logger.debug(e.getCause());
               e.printStackTrace();
          return existingOwners;
     public void setExistingOwners(List<SelectItem> existingOwners) {
          try{
          this.existingOwners = existingOwners;
          }catch(Exception e){
               logger.debug("%%%%");
               logger.debug(e.getCause());
               e.printStackTrace();
public String getSelectedOwner() {
     try{
     List<SelectItem> test = this.getExistingOwners();
     selectedOwner = (String)test.get(1).getValue();
     logger.debug("selected owner from the list" +selectedOwner);
     }catch(Exception e){
     logger.debug(e.getCause());
     e.printStackTrace();
     return selectedOwner;
     public void setSelectedOwner(String selectedOwner) {
          this.selectedOwner = selectedOwner;
public List<SelectItem> getExistingOwners() should actually be a call to the DB to get the list.
But since i was getting exception I tried to hard code the list in the method itself.
But , I get this exception:
logger.info values in the list 21
[6/15/09 12:49:45:687 EDT] 0000003d ServletWrappe E SRVE0068E: Uncaught exception thrown in one of the service methods of the servlet: /processApplication.jsp. Exception thrown : javax.servlet.ServletException: Conversion Error setting value ''{0}'' for ''{1}''.
     at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:658)
     at com.ibm._jsp._processApplication._jspService(_processApplication.java:149)
     at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:85)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:966)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:907)
     at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:118)
     at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
     at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:701)
     at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:646)
     at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:475)
     at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:463)
Earlier, I had a drop down list that was working perfectly fine.
But its values came from a Helper class and not the DB.
What is it that Iam missing or doing wrong?
Please help me.
Thanks.

Answer 1

Based on your example on the link that you referred to I tried to do this
fillSelectItems();
as the initialization block (I read what it means)
changed my getter method to
public List<SelectItem> getExistingOwners() { return existingOwners; }
private void fillSelectItems() {
this.existingOwners = new ArrayList<SelectItem>();
try{
     existingOwners.clear();
     List test = this.getOwners();
     SelectItem[] myitem = new SelectItem[test.size()];
     for(int i=0;i<test.size();i++) {
     Object[] arrayOne = (Object[])test.get(i);
try{
     SelectItem tmp = new SelectItem();
     tmp.setLabel(arrayOne[0].toString()+(String)arrayOne[1]);
     tmp.setValue((Integer)arrayOne[0]);
     myitem[i] = tmp;
this.existingOwners.add(myitem);
}catch(Exception e){
          logger.debug(e.getCause());
          e.printStackTrace();
     }catch(Exception e){
          logger.debug(e.getCause());
          e.printStackTrace();
Basically, I moved what I had earlier in getter method I have it now in the fillSelectItems()
Butthen, I get a NullPointerException.