The following fields have multiple writable mappings: field name

Hi,
I keep getting this error when I map
tables to EJB 2.0 CMP.
What does exactly mean ?

It means that you have mapped multiple mappings/attributes in your bean to the same database fields. Single only one of the mappings can write the value TopLink requires to know which one it should use, you must make the other ones read-only.
Check your mappings and make sure they are not mapping the same fields, make sure you check 1-1 mappings and they map the foreign key fields (TopLink does not require that you have attributes for the foreign key fields). You may also have incorrectly mapped a 1-1 target foreign key relationship.

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Exception [TOPLINK-48] Multiple writable mappings exist for field

Hi All
I am quite new to JPA and Toplink and I am trying to write simple JPA application using toplink essentials as the persistence provider however, when I comppile the code, get errors below saying that Multiple writable mappings exist for a given field i.e. http://J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE. The thing is, I havent tried to map this field i.e. J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE to multiple maps so I'm a bit confused as to why I'm getting this error. I have attached all the the associated code and error messages. I was hoping that some one will be able to help. I am using Eclipse Galileo and OC4j Standalone 10.1.3.4
The error are
Runtime Exceptions:
; nested exception is:
javax.persistence.PersistenceException: Exception TOPLINK-0 (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.IntegrityException
Descriptor Exceptions:
Exception TOPLINK-48 (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field http://J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE. Only one may be defined as writable, all others must be specified read-only.
Mapping: oracle.toplink.essentials.mappings.DirectToFieldMappinghttp://branch_Addr_Road_Name-->J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE
Descriptor: RelationalDescriptor(com.gworx.Bank --> http://DatabaseTable(J2EEUSER.BANKS))
Exception TOPLINK-48 (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field http://J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE. Only one may be defined as writable, all others must be specified read-only.
Mapping: oracle.toplink.essentials.mappings.DirectToFieldMappinghttp://bankName-->J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE
Descriptor: RelationalDescriptor(com.gworx.Bank --> http://DatabaseTable(J2EEUSER.BANKS))
Exception TOPLINK-48 (Oracle TopLink Essentials - 2.0.1 (Build b09d-fcs (12/06/2007))): oracle.toplink.essentials.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field http://J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE. Only one may be defined as writable, all others must be specified read-only.
Mapping: oracle.toplink.essentials.mappings.DirectToFieldMappinghttp://branch_Addr_Locality-->J2EEUSER.BANKS.BRANCH_ADDR_POSTCODE
Descriptor: RelationalDescriptor(com.gworx.Bank --> http://DatabaseTable(J2EEUSER.BANKS))
The entity class is
package com.gworx;
import java.io.Serializable;
import javax.persistence.*;
import javax.persistence.CascadeType;
@Entity
@IdClass(BankPK.class)
@Table(name = "BANKS", schema = "J2EEUSER")
public class Bank implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name = "BRANCH_SORTCODE", nullable = false, precision = 6, insertable=false, updatable=false)
long sortcode;
@Basic()
@Column(name = "BANK_NAME", nullable = false, insertable=false, updatable=false)
String bankName;
@Basic()
@Column(name = "BRANCH_NAME", nullable = false, insertable=false, updatable=false)
String branchName;
@Basic()
@Column(name = "BRANCH_ADDR_HOUSE_NAME", nullable = false, insertable=false, updatable=false)
String branch_Addr_House_Name;
@Basic()
@Column(name = "BRANCH_ADDR_ROAD_NAME",nullable = false, insertable=false, updatable=false)
String branch_Addr_Road_Name;
@Basic()
@Column(name = "BRANCH_ADDR_LOCALITY", nullable = false, insertable=false, updatable=false)
String branch_Addr_Locality;
@Basic()
@Column(name = "BRANCH_ADDR_CITY",nullable = false, insertable=false, updatable=false)
String branch_Addr_City;
@OneToOne(cascade=CascadeType.ALL)
@Basic()
@Column(name = "BRANCH_ADDR_POSTCODE", nullable = false)
String branch_Addr_Postcode;
public Bank(){}
public Bank(
String bankName,
String branchName,
long sortcode,
String branch_Addr_House_Name,
String branch_Addr_Road_Name,
String branch_Addr_Locality,
String branch_Addr_City,
String branch_Addr_Postcode)
this.bankName=bankName;
this.sortcode=sortcode;
this.branchName = branchName;
this.branch_Addr_House_Name=branch_Addr_House_Name;
this.branch_Addr_Road_Name=branch_Addr_Road_Name;
this.branch_Addr_Locality=branch_Addr_Locality;
this.branch_Addr_City=branch_Addr_City;
this.branch_Addr_Postcode=branch_Addr_Postcode;
public void setSortcode(long sortcode){
this.sortcode =sortcode;
public long getSortCode(){
return this.sortcode;
The PK class is
public class BankPK implements Serializable {
public long sortcode;
public BankPK(long sortcode){
this.sortcode = sortcode;
public boolean equals(Object obj){
if(obj==null || !(obj instanceof BankPK)){
return false;
else if (((BankPK)obj).sortcode ==sortcode)
return true;
else
return false;
public int hashCode(){
StringBuffer buff = new StringBuffer();
buff.append(sortcode);
int hashCode =buff.hashCode();
return hashCode;
My stateless session bean that I use to create to create the entity is
package com.gworx;
import javax.ejb.Local;
import javax.ejb.Stateless;
import javax.persistence.*;
import javax.ejb.Remote;
import com.gworx.BankBeanRemote;
@Stateless
public class BankBean implements BankBeanRemote {
@PersistenceContext
EntityManager entMgr;
public Account account;
long sortcode, cust_id;
//Bank Details
String bankName,branchName,branch_Addr_House_Name,
branch_Addr_Road_Name,branch_Addr_Locality,
branch_Addr_City, branch_Addr_Postcode;
public BankBean() {
// TODO Auto-generated constructor stub
// entMgr=emf.createEntityManager();
public void make_A_Bank(
String bankName,
String branchName,
long sortcode,
String branch_Addr_House_Name,
String branch_Addr_Road_Name,
String branch_Addr_Locality,
String branch_Addr_City,
String branch_Addr_Postcode
this.sortcode=sortcode;
this.bankName =bankName;
this.branchName = branchName;
this.branch_Addr_House_Name=branch_Addr_House_Name;
this.branch_Addr_Road_Name=branch_Addr_Road_Name;
this.branch_Addr_Locality=branch_Addr_Locality;
this.branch_Addr_City=branch_Addr_City;
this.branch_Addr_Postcode=branch_Addr_Postcode;
Bank bank = new Bank( bankName,branchName,sortcode,branch_Addr_House_Name,
branch_Addr_Road_Name,branch_Addr_Locality,
branch_Addr_City, branch_Addr_Postcode);
entMgr.persist(bank);
}

Hi quophyie,
try removing the @OneToOne annotation, after all your postcode is just a string, there's nothing to cascade.
And it would help a lot if you formatted your code.
Zsom

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www.sbrickey.com
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The following fields have multiple writable mappings: field name

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