8 Replies Latest reply on Feb 23, 2011 10:06 AM by abreumania

How to bind a JPA entity as a backing bean for a simple CRUD screen

infinity2heaven Jan 31, 2011 3:21 PM

Very simple use case: A Create screen for a CRUD operation.

SLSB

@Stateless(name="memberRegistration")
public class MemberRegistrationImpl
     implements MemberRegistration {

     @PersistenceContext
     private EntityManager em;

     @Inject
     private Event< Member > event;

        
        // backing/binding bean used in JSF page. Also a JPA entity
        // @Model also doesn't work. Don't think I can @Inject an entity object either 
     private Member member = new Member();

     public String register() {

          em.persist( member );

          event.fire( member );

          return "home";

     }

     
     public Member getMember() {

          return member;
     }

     public void setMember(
          Member member ) {

          this.member = member;
     }

}

jsf page:

<h:form id="registration" prependId="false">
     <h:panelGroup styleClass="" layout="block">
          <div class="prompt">#{label}</div>
          <h:panelGrid columns="1">
        first name:
        <h:inputText value="#{memberRegistration.member.firstName}" required="true" />
        last name:
        <h:inputText value="#{memberRegistration.member.lastName}" required="true" />
        email:
        <h:inputText value="#{memberRegistration.member.email}" required="true" />
         phone number:
        <h:inputText value="#{memberRegistration.member.phoneNumber}" />
         dob:
        <h:inputText value="#{memberRegistration.member.dob}" required="true" />
         notes:
        <h:inputTextarea value="#{memberRegistration.member.notes}" />

          </h:panelGrid>
          <h:panelGroup>
               <h:commandButton id="lsubmitButton" value="Save"
                    action="#{memberRegistraion.save}" />
          </h:panelGroup>
     </h:panelGroup>
</h:form>

On page load, I get this error

Error Rendering View[/patient-registration.xhtml]: javax.el.PropertyNotFoundException: /patient-registration.xhtml @20,95 value="#{memberRegistration.member.firstName}": The class 'xxx.demoportal.controller.org$jboss$weld$bean-jboss$classloader:id="vfs:$$$Users$xxx$dev$servers$jboss-6$0$0$Final$server$default$deploy$demo$portal$war"-ManagedBean-class_xxx$demoportal$controller$MemberRegistration_$$_WeldClientProxy' does not have the property 'member'.
     at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:108) [:2.0.3-]
     at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190) [:2.0.3-]
     at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178) [:2.0.3-]
     at javax.faces.component.UIOutput.getValue(UIOutput.java:164) [:2.0.3-]
     at com.sun.faces.renderkit.html_basic.HtmlBas

1. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

alesj Jan 31, 2011 4:25 PM (in response to infinity2heaven)

Does interface MemberRegistration expose getMember?
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2. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

infinity2heaven Jan 31, 2011 8:47 PM (in response to infinity2heaven)

Yes.
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3. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

infinity2heaven Feb 1, 2011 2:35 AM (in response to infinity2heaven)

I have the spent the whole day trying to save a simple entity object but without success. I've implemented this simple use case (& much more) with other popular frameworks (inc Seam 2) in the past so I believed this was something trivial. I'd like to rephrase my question and see if there's a better response.

-- How do you expose Entity objects to JSF (as in Seam 2)? Weld Reference guide warns you not to do it but doesn't give an alternative. I understand that you can create a copy of it add a @Model bean that can be injected into the SLSB or SFSB. But that's like DTOs and I will avoid it at any cost.
-- Does anyone have a working example of a CRUD implemented?

Thanks
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4. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

ssachtleben.ssachtleben.gmail.com Feb 1, 2011 3:07 AM (in response to infinity2heaven)
Try

@Named @Stateless public class MemberRegistrationImpl implements MemberRegistration { ... }

to use each property with public getter like

#{memberRegistration.member}

Another option is:

@Produces @Named getCurrentMember() { return member; }

for directly using

#{currentMember}
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5. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

infinity2heaven Feb 1, 2011 3:32 AM (in response to infinity2heaven)

Strange but I have tried this too and I still get the same error.


@Named( "memberRegistration" )
@Stateless
public class MemberRegistrationImpl
     implements MemberRegistration, Serializable {

     private static final long serialVersionUID = 985615785945128136L;

     @Inject
     private Logger log;

     @PersistenceContext
     private EntityManager em;

     @Inject
     private Event< Member > event;

     private Member newMember;

     public void register() {

          log.debug( "Persisting a new member" );
          em.persist( newMember );

          event.fire( newMember );

     }

     @Override
     public List< Member > listMembers() {

          // TODO Auto-generated method stub
          return null;
     }

     @PostConstruct
     public void initNewMember() {

          newMember = new Member();
     }

     @Produces
     @Named
     public Member getNewMember() {

          return newMember;
     }
}

Access code in jsf (primefaces)

<h:inputText value="#{memberRegistration.member.firstName}" required="true" />

6. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

alesj Feb 1, 2011 3:56 AM (in response to infinity2heaven)

There is no getMember in this last code snippet.
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7. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

infinity2heaven Feb 1, 2011 1:16 PM (in response to infinity2heaven)

There was a typeo in the jsf page (should've been #{memberRegistration.newMember.firstName}")

Thanks, a basic save is working. Will be implementing other use cases now.
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8. Re: How to bind a JPA entity as a backing bean for a simple CRUD screen

abreumania Feb 23, 2011 10:06 AM (in response to infinity2heaven)

Try to build a update entity. First you find, update and try to persist!

You will get the detached entity passed to persist. Showing the PC isnt working good with the conversarion scope.
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