[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-756) @Column annotation ignored when placed on entity's @Id property

[Karsten Gresch (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31476#action_31476 ] 

Karsten Gresch commented on ANN-756:
------------------------------------

Not being able to map the @Id annotated member via @Column with the db field makes the @IdClass feature rather unusable. 

How would you e.g. fetch data if the created sql points to notexisting columns?

Any chance to get a fix? Any workaround?

> @Column annotation ignored when placed on entity's @Id property
> ---------------------------------------------------------------
>
>                 Key: ANN-756
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-756
>             Project: Hibernate Annotations
>          Issue Type: Bug
>    Affects Versions: 3.3.1.GA
>         Environment: hib core 3.2.6, my sql 5
>            Reporter: sagi mann
>
> Hibernate docs specify that when using a compound key class, a Hibernate optional feature is to place @Column annotations within the key class. The observed behavior is that Hibernate ignores @Column if placed ANYWHERE ELSE, for example, on the entity's ID properties. In other words, the standard JPA way of annotating ID fields is not working under Hibernate, and the "optional" feature is mandatory.
> Example how to reproduce (see comments inside the code regarding the inconsistency above). Accessors were omitted for clarity:
> // the identity class 
> @Entity 
> public class SecurityIdentity implements Serializable { 
>     
>     public SecurityIdentity() {} 
>     
>     @Id 
>     @Column(name="IDENTITY_ID") 
>     @GeneratedValue 
>     public Long getId() ... 
>     @Column(name="IDENTITY_NAME") 
>     public String getName() ... 
>     
>     @Override public boolean equals(Object o) ... 
>     @Override public int hashCode() ... 
> } 
> // the domain class 
> @Entity 
> public class SecurityDomain implements Serializable { 
>     
>     public SecurityDomain() {} 
>     
>     @Id 
>     @Column(name="DOMAIN_ID") 
>     @GeneratedValue 
>     public Long getId() ... 
>     @Column(name="DOMAIN_NAME") 
>     public String getName() ... 
>     
>     @Override public boolean equals(Object o) ... 
>     @Override public int hashCode() ... 
> } 
> // the domain-identity mapping class 
> @Entity 
> @IdClass(pu1.DomainIdentityPK.class) 
> public class DomainIdentity implements Serializable { 
>     
>     public DomainIdentity() {} 
>     @Id 
>     public Long getDomainId() ... 
>     @Id 
>     public String getUserAlias() ...    
>     @ManyToOne 
>     @JoinColumn(name="IDENTITY_ID") 
>     public SecurityIdentity getSecurityIdentity() ... 
>     @ManyToOne 
>     @JoinColumn(name="DOMAIN_ID", insertable=false, updatable=false) 
>     public SecurityDomain getSecurityDomain() { return securityDomain; } 
>     public void setSecurityDomain(SecurityDomain securityDomain) { 
>         this.securityDomain = securityDomain; 
>         this.domainId = (securityDomain != null ? securityDomain.getId() : null); 
>     } 
>     private SecurityDomain securityDomain; 
> } 
> // the map key class 
> public class DomainIdentityPK implements Serializable { 
>     
>     public DomainIdentityPK() { 
>     } 
>     
>     /********* @Column inconsistency - cannot be placed inside the entity - only inside the PK class *******/ 
>     @Column(name="DOMAIN_ID") 
>     public Long getDomainId() ... 
>     [b]@Column(name="ALIAS")[/b] 
>     public String getUserAlias() ... 
>     public boolean equals(Object o) ... 
>     public int hashCode() ... 
> } 

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