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Re: [eclipselink-users] Mapping Question - OneToMany Create Table from Entity Fails 
Hello,
As the error states, the CCFParameter.id database field is mapped twice. Notice that CCFParameter's id and ccfgroup both use the "id" field - one of them will need to be set as insertable=false updateable=false. 

Best Regards,
Chris

RogerV wrote:

I've got the following entity definitions (trimmed) below. When I try to
generate Tables from Entities I get the error message;

Exception [EclipseLink-48] (Eclipse Persistence Services -
1.1.2.v20090612-r4475):
org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field
[CCFParameter.id].  Only one may be defined as writable, all others must be
specified read-only.
Mapping: org.eclipse.persistence.mappings.OneToOneMapping[ccfgroup]
Descriptor: RelationalDescriptor(com.blackbox.entities.db.CCFParameter -->
[DatabaseTable(CCFParameter)])

What do I need to correct this and what does it actually mean?

Regards

@Entity
@Table(name="CCFGroup")
public class CCFGroup {
	

	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	@Column(name="id")
	private int id;
	
	
	//bi-directional many-to-one association to CCFParameter
	@OneToMany(mappedBy="ccfgroup",fetch=FetchType.LAZY,
cascade={CascadeType.ALL})
	private Set<CCFParameter> ccfParameters;

    	public CCFGroup() {
    	}

	public int getId() {
		return this.id;
	}

	public void setId(int id) {
		this.id = id;
	}

	
	public Set<CCFParameter> getCcfParameters() {
		return this.ccfParameters;
	}

	public void setCcfParameters(Set<CCFParameter> ccfParameters) {
		this.ccfParameters = ccfParameters;
	}

}

@Entity
@Table(name="CCFParameter")
public class CCFParameter implements Serializable {
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	@Column(name="id")
	private int id;

	@Column(name="description", nullable=false, length=128)
	private String description;

	@Column(name="idsDescription", nullable=false, length=128)
	private String idsDescription;

	@Column(name="parameterName", unique=true, nullable=false, length=64)
	private String parameterName;

	
	@ManyToOne (cascade=CascadeType.ALL)
	@JoinColumn(name="id")
	private CCFGroup ccfgroup;
	
	@Version
	@Column(name="version", nullable=false)
	private long version;

	@Column(name="display", nullable=false, length=1)
	private String display;
	
    public CCFParameter() {
    }

	public int getId() {
		return this.id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public CCFGroup getCCFGroup() {
		return ccfgroup;
	}
	
	public void setCCFGroup(CCFGroup ccfgroup) {
		this.ccfgroup = ccfgroup;
	}
	
	public String getDescription() {
		return this.description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getIdsDescription() {
		return this.idsDescription;
	}

	public void setIdsDescription(String idsDescription) {
		this.idsDescription = idsDescription;
	}

	public String getParameterName() {
		return this.parameterName;
	}

	public void setParameterName(String parameterName) {
		this.parameterName = parameterName;
	}

	public long getVersion() {
		return this.version;
	}

	public void setVersion(long version) {
		this.version = version;
	}

	public String getDisplay() {
		return display;
	}
	public void setDisplay(String display) {
		this.display = display;
	}

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