Bean Value is always Null

[Omar Barrera]

Hello All,

I am new to JSF and am having an issue with a selectonemenu component always being null. I have form that is is populated with backing bean list that has the states. On the form the list displays properly. However when I attempt to write the value to the database, I get a null value.


Backing bean with list:

  public List<SelectItem> getStates() {
if (states_ == null) {
states_ = new ArrayList<SelectItem>();
states_.add(new SelectItem("ZZ", "Select a State"));
states_.add(new SelectItem("AL", "Alabama"));
states_.add(new SelectItem("AK", "Alaska"));
states_.add(new SelectItem("AZ", "Arizona"));
states_.add(new SelectItem("CA", "California"));
states_.add(new SelectItem("CO", "Colorado"));
states_.add(new SelectItem("CT", "Connecicut"));
states_.add(new SelectItem("DE", "Delaware"));
states_.add(new SelectItem("DC", "District of Columbia"));
states_.add(new SelectItem("FL", "Florida"));
states_.add(new SelectItem("GA", "Georgia"));
states_.add(new SelectItem("HI", "Hawaii"));
states_.add(new SelectItem("ID", "Idaho"));
states_.add(new SelectItem("IL", "Illinois"));
states_.add(new SelectItem("IN", "Indiana"));
states_.add(new SelectItem("IA", "Iowa"));
states_.add(new SelectItem("KS", "Kanasas"));
states_.add(new SelectItem("KY", "Kentucky"));
states_.add(new SelectItem("LA", "Louisiana"));
states_.add(new SelectItem("ME", "Maine"));
states_.add(new SelectItem("MD", "Maryland"));
states_.add(new SelectItem("MA", "Massachusetts"));
states_.add(new SelectItem("MI", "Michigan"));
states_.add(new SelectItem("MN", "Minnesota"));
states_.add(new SelectItem("MO", "Missouri"));
states_.add(new SelectItem("MT", "Montana"));
states_.add(new SelectItem("NE", "Nebraska"));
states_.add(new SelectItem("NV", "Nevada"));
states_.add(new SelectItem("NH", "New Hampshire"));
states_.add(new SelectItem("NJ", "New Jersey"));
states_.add(new SelectItem("NM", "New Mexico"));
states_.add(new SelectItem("NY", "New York"));
states_.add(new SelectItem("NC", "North Carolina"));
states_.add(new SelectItem("ND", "North Dakota"));
states_.add(new SelectItem("OH", "Ohio"));
states_.add(new SelectItem("OK", "Oklahoma"));
states_.add(new SelectItem("OR", "Oregon"));
states_.add(new SelectItem("PA", "Pennsylvania"));
states_.add(new SelectItem("RI", "Rhode Island"));
states_.add(new SelectItem("SC", "South Carolina"));
states_.add(new SelectItem("TN", "Tennessee"));
states_.add(new SelectItem("TX", "Texas"));
states_.add(new SelectItem("UT", "Utah"));
states_.add(new SelectItem("VT", "Vermont"));
states_.add(new SelectItem("VA", "Virginia"));
states_.add(new SelectItem("WV", "West Virginia"));
states_.add(new SelectItem("WI", "Wisconsin"));
states_.add(new SelectItem("WY", "Wyoming"));
}
return states_;
}  

jsp view page:

   <h:outputText id="residenceStateLabel" value="Residence State" />
<h:selectOneMenu id="residenceSelectState" value="#{stateBean.selectedState}">
<f:selectItems value="#{stateBean.states}"/>
</h:selectOneMenu>
 

selectedState method:

  public void setSelectedState(String state) {
this.state_ = state;}  

[Nat Dickstein]

Hello Omar,
it seems that states_ isn't null, maybe you instatiated it and it is empty? Check for (states_!= && states_.size() < 1)

[Omar Barrera]

What I noticed in my code is that I initialized state_ to null. So I corrected that and am now getting another error. The error I am getting is Caused by: java.lang.NoSuchMethodError:

Here is a copy of the class I am using:

When I am calling the getSelectedState method from the bean I am getting
Caused by: java.lang.NoSuchMethodError: stateBean.getState()Ljava/lang/String;

import javax.faces.model.SelectItem;
import java.util.ArrayList;
import java.util.List;
 
public class stateBean implements java.io.Serializable{
 
/**
 * 
 */
private static final long serialVersionUID = 10L;
private String state_ = "";
private ArrayList<SelectItem> states_ = null;
 
// constructor must take no arguments
public stateBean() {
 
}
//Getters--------------------------------------------------------------------
public List<SelectItem> getStates() {
if (states_ == null) {
states_ = new ArrayList<SelectItem>();
states_.add(new SelectItem("ZZ", "Select a State"));
states_.add(new SelectItem("AL", "Alabama"));
states_.add(new SelectItem("AK", "Alaska"));
states_.add(new SelectItem("AZ", "Arizona"));
states_.add(new SelectItem("CA", "California"));
states_.add(new SelectItem("CO", "Colorado"));
states_.add(new SelectItem("CT", "Connecicut"));
states_.add(new SelectItem("DE", "Delaware"));
states_.add(new SelectItem("DC", "District of Columbia"));
states_.add(new SelectItem("FL", "Florida"));
states_.add(new SelectItem("GA", "Georgia"));
states_.add(new SelectItem("HI", "Hawaii"));
states_.add(new SelectItem("ID", "Idaho"));
states_.add(new SelectItem("IL", "Illinois"));
states_.add(new SelectItem("IN", "Indiana"));
states_.add(new SelectItem("IA", "Iowa"));
states_.add(new SelectItem("KS", "Kanasas"));
states_.add(new SelectItem("KY", "Kentucky"));
states_.add(new SelectItem("LA", "Louisiana"));
states_.add(new SelectItem("ME", "Maine"));
states_.add(new SelectItem("MD", "Maryland"));
states_.add(new SelectItem("MA", "Massachusetts"));
states_.add(new SelectItem("MI", "Michigan"));
states_.add(new SelectItem("MN", "Minnesota"));
states_.add(new SelectItem("MO", "Missouri"));
states_.add(new SelectItem("MT", "Montana"));
states_.add(new SelectItem("NE", "Nebraska"));
states_.add(new SelectItem("NV", "Nevada"));
states_.add(new SelectItem("NH", "New Hampshire"));
states_.add(new SelectItem("NJ", "New Jersey"));
states_.add(new SelectItem("NM", "New Mexico"));
states_.add(new SelectItem("NY", "New York"));
states_.add(new SelectItem("NC", "North Carolina"));
states_.add(new SelectItem("ND", "North Dakota"));
states_.add(new SelectItem("OH", "Ohio"));
states_.add(new SelectItem("OK", "Oklahoma"));
states_.add(new SelectItem("OR", "Oregon"));
states_.add(new SelectItem("PA", "Pennsylvania"));
states_.add(new SelectItem("RI", "Rhode Island"));
states_.add(new SelectItem("SC", "South Carolina"));
states_.add(new SelectItem("TN", "Tennessee"));
states_.add(new SelectItem("TX", "Texas"));
states_.add(new SelectItem("UT", "Utah"));
states_.add(new SelectItem("VT", "Vermont"));
states_.add(new SelectItem("VA", "Virginia"));
states_.add(new SelectItem("WV", "West Virginia"));
states_.add(new SelectItem("WI", "Wisconsin"));
states_.add(new SelectItem("WY", "Wyoming"));
}
return states_;
}
 
public String getSelectedState() {
return state_;
}
 
public void setSelectedState(String state) {
this.state_ = state;
}
 
}    

Caused by: javax.faces.FacesException: Error calling action method of component with id _idJsp0Pluto_264_:SaveButton
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:72)
at javax.faces.component.UICommand.broadcast(UICommand.java:109)
at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:97)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:171)
at org.apache.myfaces.lifecycle.InvokeApplicationExecutor.execute(InvokeApplicationExecutor.java:32)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:95)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:70)
at org.apache.myfaces.portlet.MyFacesGenericPortlet.processAction(MyFacesGenericPortlet.java:246)
... 38 more
Caused by: javax.faces.el.EvaluationException: Exception while invoking expression #{databaseHandler.InsertApplicant}
at org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:156)
at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:61)
... 45 more
[ July 07, 2008: Message edited by: Omar Barrera ]

[Omar Barrera]

I was able to get my code to run partially correct. However I am still having an issue binding the selectonemenu item that is selected from the jsp view to the information in the bean. Again, forgive my ignorance as I am new to JSF, 1st project btw, but I thought if used the value element in the selectonemenu component tag, then the value the user selects would be bound by the get and set methods of the underlying bean.

Omar