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20130122

[SOLVED] javax.el.PropertyNotFoundException: listTADs.xhtml value="#{del.name}": Property 'name' not found on type org.hibernate.collection.PersistentSet

i'm currently working on cutting out wrapper classes in one area of our application, and using the entity directly instead of a wrapper class, and i came across a weird error when i tried iterating a Set in the entity:

javax.el.PropertyNotFoundException: listTADs.xhtml value="#{del.name}": Property 'name' not found on type org.hibernate.collection.PersistentSet

here's some of the code.

##########

TAD.java:

@Entity
@Table(name = "TAD")
...
public class TAD extends Persistent implements Serializable {
...
    /** The despatch party*/
    @ManyToMany(fetch = FetchType.EAGER)
    @JoinTable(name="ADP",
            joinColumns={@JoinColumn(name="AGREEMENT_ID")},
            inverseJoinColumns={@JoinColumn(name="PARTY_ID")})
    private Set<TAP> despatchParties  = new HashSet<TAP>();
...
    public Set<TAP> getDespatchParties() {
        return despatchParties;
    }
...



TAP.java:

@Entity
@Table(name = "TAP")
...
public class TAP extends Persistent implements Serializable {
...
    /** The name */
    @Column(name = "NAME")
    @Basic(fetch = FetchType.EAGER)
    private String name;
...
    public String getName() {
        return name;
    }



listTADs.xhtml:

<rich:dataTable id="pickupParties" value="#{tad.despatchParties}" var="del">
    <rich:column>
        <f:facet name="header">
            <h:outputText
                value="#{msg['label.db.PARTY_NAME']}" />
        </f:facet>
        <h:outputText value="#{del.name}"></h:outputText>
    </rich:column>
...


##########

what was happening was that despatchParties.size() was always 1 no matter how many entries it had, e.g. 3 TAPs, and the del var was the container for the actual set, so the application was trying to call getName() on the whole Set--which obviously wouldn't work because java.util.Set doesn't have a getName() method. it looked like this:

Method not found: [TAP [id=2745, agreementOwnerId=TestBuyer, name=XHentested_1469, idInAgreement=XHID_1469, eanLocationNumber=null, ldapId=null, city=Oslo, postCode=0152, street=Prinsens gt. 1, role=Despatch Party, parentOrganizationId=null, goodstype=null, countryCode=NO, contact=example@example.no, language=no_NO, langRole=null, selected=false, referredPartyId=null]].getName()


so to iterate the Set in the rich:dataTable i had to add a toArray() call so that del var would be an entry in the actual set:

<rich:dataTable id="pickupParties" value="#{tad.despatchParties.toArray()}" var="del">
    <rich:column>
        <f:facet name="header">
            <h:outputText
                value="#{msg['label.db.PARTY_NAME']}" />
        </f:facet>
        <h:outputText value="#{del.name}"></h:outputText>
    </rich:column>
...

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