p:selectManyMenu report validation error (illegal select options) [duplicate] - jsf

Question

This question already has answers here:
Validation Error: Value is not valid
(3 answers)
Closed 7 years ago.
I use primefaces's p:selectManyMenu. When I submit the value, it always report validation error Illegal selection options. Can you help to solve this issue?
JSF code:
<h:outputLabel for="scenario" value="GivenStories:" />
<p:selectManyMenu id="givenstoryselect" value="#{anotherDynaFormController.selectedGivenStory}" converter="scenarioConverter" var="g" style="width:500px;height:70px;align:left;" showCheckbox="true" >
<f:selectItems value="#{anotherDynaFormController.givenStorys}" var="scenario" itemLabel="#{scenario.name}" itemValue="#{scenario}" />
<p:column>#{g.name}</p:column>
</p:selectManyMenu>
Bean class:
//converter
#FacesConverter(value="scenarioConverter")
public class ScenarioConverter implements Converter {
public static List<Scenario> scenarioDB = new ArrayList<Scenario>();
private ScenarioDao scenarioDao = new ScenarioDao();
public Object getAsObject(FacesContext facesContext, UIComponent component, String submittedValue) {
if (submittedValue.trim().equals("")) {
return null;
} else {
try {
int number = Integer.parseInt(submittedValue);
scenarioDB = scenarioDao.findAll();
for (Scenario p : scenarioDB) {
if (p.getId() == number) {
return p;
}
}
} catch(NumberFormatException exception) {
throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Conversion Error", "Not a valid scenario"));
}
}
return null;
}
public String getAsString(FacesContext facesContext, UIComponent component, Object value) {
if (value == null) {
return null;
} else {
return String.valueOf(((Scenario) value).getId());
}
}
}
#ManagedBean
#ViewScoped
public class AnotherDynaFormController extends SuperBean implements Serializable {
private List<Scenario> givenStorys;
private List<Meta> selectedMetas;
private List<Scenario> selectedGivenStory;
private List<ProjectTree> parents;
public DynaFormModel getModel() {
givenStorys = scenarioDao.findAll();
...
}
...
}

Answer 1

Try this generic converter and see if problem still there .
import java.util.Map;
import java.util.Map.Entry;
import java.util.UUID;
import java.util.WeakHashMap;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;
#FacesConverter(value = "entityConverter")
public class EntityConverter implements Converter {
private static Map<Object, String> entities = new WeakHashMap<Object, String>();
#Override
public String getAsString(FacesContext context, UIComponent component, Object entity) {
synchronized (entities) {
if (!entities.containsKey(entity)) {
String uuid = UUID.randomUUID().toString();
entities.put(entity, uuid);
return uuid;
} else {
return entities.get(entity);
}
}
}
#Override
public Object getAsObject(FacesContext context, UIComponent component, String uuid) {
for (Entry<Object, String> entry : entities.entrySet()) {
if (entry.getValue().equals(uuid)) {
return entry.getKey();
}
}
return null;
}
}

Answer 2

thanks a lot. I have find the reason of this issue. I should overwrite the equals and hashcode method in this object. Then it works.
#Override
public boolean equals(Object obj) {
if(obj == null)
return false;
if(!(obj instanceof Scenario))
return false;
return ((Scenario)obj).getId().equals(this.id);
}
#Override
public int hashCode() {
int hash = 1;
return hash * 31 + name.hashCode();
}