Re: [eclipselink-users] Entity relationship issue

["Tim Hollosy" <hollosyt@xxxxxxxxx>]

You forgot the mappedBy attribute in your @ManyToOne annotation it
should be @ManyToOne(fetch = FetchType.LAZY,mappedBy="messages")

You might try to generate your Entities using the Dali JPA Tools in
Eclipse to see the proper way to do these mappings.

./tch



On Tue, Dec 2, 2008 at 11:59 PM, khaskett <khaskett@xxxxxxxxxxx> wrote:
>
> I added the @ManyToOne and i still get the same error -
>
> public class CpUser extends BaseDomain {
> ....
>    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy =
> "cpUser")
>    @JoinColumn(referencedColumnName = "USER_ID")
>    public Set<CpMsg> getMessages() {
>        return messages;
>    }
>
> public class CpMsg extends BaseDomain {
> ....
>    @ManyToOne(fetch = FetchType.LAZY)
>        public CpUser getCpUser() {
>                return this.cpUser;
>        }
>
> Thanks for the reply.
>
>
> Tim Hollosy wrote:
>>
>> It doesn't look like your relationship is defined in both entities. In
>> JPA you always need to make sure you do this. You need to have the
>> @ManyToOne annotation back in your CpMsg entity.
>>
>> Check: http://en.wikibooks.org/wiki/Java_Persistence/OneToMany
>>
>> for more info.
>> ./tch
>>
>>
>>
>> On Tue, Dec 2, 2008 at 6:20 PM, khaskett <khaskett@xxxxxxxxxxx> wrote:
>>>
>>> I am having an issue with creating a relationship between 2 entities,
>>> where
>>> the parent entity was created from a Stored Procedure. When I try to use
>>> the
>>> @OneToMany annotation it tries to join the two entities.
>>>
>>> @Entity
>>> public class CpUser extends BaseDomain {
>>>
>>>    // Attributes
>>>    @Id
>>>    @Column(name = "paramUserID")
>>>    private String userId;
>>>
>>>    @Column(name = "paramInitials")
>>>    private String initials;
>>>
>>>    @Column(name = "paramFirstName")
>>>    private String firstName;
>>>
>>>    @Column(name = "paramLastName")
>>>    private String lastName;
>>>
>>>     .....
>>>
>>>    /*
>>>     * List of user messages
>>>     */
>>>    private Set<CpMsg> messages = new HashSet<CpMsg>(0);
>>>
>>>   .....
>>>    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy
>>> =
>>> "userId")
>>>    public Set<CpMsg> getMessages() {
>>>        return messages;
>>>    }
>>> }  // End CpUser
>>>
>>> @Entity
>>> @Table(name = "CP_MSG")
>>> public class CpMsg extends BaseDomain {
>>>
>>>        // Fields
>>>        @Id
>>>        @GeneratedValue(strategy = GenerationType.IDENTITY)
>>>        @Column(name = "MSG_ID", unique = true, nullable = false,
>>> precision = 11,
>>> scale = 0)
>>>        private Long msgId;
>>>        @Column(name = "MSG_TEXT", nullable = false)
>>>        private String msgText;
>>>
>>>        private CpUser cpUser;
>>>    ....
>>>        public CpUser getCpUser() {
>>>                return this.cpUser;
>>>        }
>>> } //End CpMsg
>>>
>>> I removed some fields for brevity.
>>> When I try and get the messages for that user by calling getMessages() I
>>> get
>>> this in the logs -
>>> Call: SELECT t1.MSG_ID, t1.MSG_TEXT, t1.USER_ID FROM CPUSER_CP_MSG t0,
>>> CP_MSG t1 WHERE ((t0.CpUser_paramUserID = ?) AND (t1.MSG_ID =
>>> t0.messages_MSG_ID))
>>>        bind => [USER123]
>>>
>>> And the error is that CPUSER_CP_MSG doesnt exist, which is correct.
>>>
>>> I guess I assumed it would just do a select on the child table passing in
>>> the value from the parent.
>>>
>>> Thanks in advance
>>>
>>> --
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>>> http://www.nabble.com/Entity-relationship-issue-tp20803337p20803337.html
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>>>
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>>> eclipselink-users mailing list
>>> eclipselink-users@xxxxxxxxxxx
>>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>>
>> _______________________________________________
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>> https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>
>>
>
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>
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