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

Question

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);
}

Answer 1

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