[jboss-user] [JBoss Seam] - fetchtype.LAZY results in JSF validation error

[roeber]

I found out that setting fetchtype.LAZY on a manyToOne association results in a JSF validation error for an selectOneMenu component. 

  | @ManyToOne(fetch=FetchType.LAZY)
  | public OrgUnit getOrgUnit() {
  | return orgUnit;
  | }
  | 


  | <t:selectOneMenu id="orgunit" required="true" value="#{activity.orgUnit}" converter="orgunitconverter">
  | <f:selectItems value="#{selectitemservice.orgUnitChoices}"/>
  | </t:selectOneMenu>
  | 

  | public Object getAsObject(FacesContext context, UIComponent comp,
  | 	String value) throws ConverterException {		
  | 		
  | 	if (!StringUtils.isNumeric(value))
  | 		return null ;
  | 				
  | 	Long id = Long.valueOf(value);
  | 	Object object = em.find(OrgUnit.class, id);
  | 
  | 	return object ;
  | }
  | 
  | public String getAsString(FacesContext context, UIComponent component,
  | 	Object object) throws ConverterException {
  | 		
  | 	if (object == null) {
  | 		return null;
  | 	}
  | 	if (object instanceof OrgUnit) {
  | 		OrgUnit orgUnit = (OrgUnit)object ;
  | 		String returnString = orgUnit.getId().toString();
  | 		return returnString;
  | 	}
  | 	return null ;
  | }
  | 

The converter for OrgUnit seems to work: All units are displayed in the drop-down box and the current unit is also selected correctly in the box.
But submitting a page with this component shows a validation error saying: "orgunit": Value is not a valid option.
There are many things which could go wrong on my side but just removing the 'fetch=fetchtype.LAZY' (and therefore implicitly changing fetchtype to EAGER) results in a perfect working dialog. I suspect the use of a proxy for lazy fetching in Hibernate causing this, but debugging and tracing the converter and equals methods doesn't help me.

Any ideas would be appreciated.

--
Axel



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