Hi,
Here check the following for entity variables:
http://java.sun.com/javaee/5/docs/tutorial/doc/PersistenceIntro2.html
>From: "Eve Pokua" <gorgeous65_at_msn.com>
>Reply-To: persistence_at_glassfish.dev.java.net
>To: persistence_at_glassfish.dev.java.net
>Subject: Re: WG: mappedBy problem in subclasses
>Date: Tue, 22 May 2007 14:56:07 +0100
>
>Hi,
>
>Also could you have a look at this variable:
>
>'private static final long serialVersionUID = 1L;'
>
>an entity should not have any final variable or methods.
>Please double check this as I maybe wrong.
>
>eve
>
>
>>From: Michael Bouschen <Michael.Bouschen_at_Sun.COM>
>>Reply-To: persistence_at_glassfish.dev.java.net
>>To: persistence_at_glassfish.dev.java.net
>>Subject: Re: WG: mappedBy problem in subclasses
>>Date: Tue, 22 May 2007 14:46:20 +0200
>>
>>Hi Jürg,
>>
>>your classes use property based access type, meaning the persistent state
>>is defined using JavaBeans style property accessors. The getter/setter
>>methods
>> public ClassDef getClassOwner()
>> public void setClassOwner(ClassDef ClassOwner)
>>define a property called classOwner. Please note the property name starts
>>with a lower case 'c'.
>>
>>I propose you try to use the lower case property name in your mappedBy
>>clause:
>>
>>@OneToMany(cascade=javax.persistence.CascadeType.ALL,mappedBy="classOwner")
>>
>>Regards Michael
>>
>>>
>>>
>>>I created three entity classes:
>>>
>>>An abstract class Type
>>>@Entity
>>>public abstract class Type implements Serializable {
>>> private static final long serialVersionUID = 1L;
>>> private Long id;
>>> private java.sql.Timestamp Version;
>>>
>>> public Type() {
>>> }
>>>
>>> public void setId(Long id) {
>>> this.id = id;
>>> }
>>>
>>> @Id
>>> @GeneratedValue(strategy = GenerationType.AUTO)
>>> public Long getId() {
>>> return id;
>>> }
>>>
>>> @Version
>>> public Timestamp getVersion() {
>>> return Version;
>>> }
>>>
>>> public void setVersion(Timestamp Version) {
>>> this.Version = Version;
>>> }
>>>
>>>
>>>}
>>>
>>>A subclass "ClassDef"
>>>
>>>@Entity
>>>public class ClassDef extends Type implements Serializable {
>>> private static final long serialVersionUID = 1L;
>>> private String Name;
>>> private boolean Abstract;
>>> java.util.List<Attribute> Attributes;
>>> public ClassDef() {
>>> Attributes = new java.util.ArrayList<Attribute>();
>>>
>>> }
>>> @Column(nullable=false)
>>> public String getName() {
>>> return Name;
>>> }
>>> public void setName(String Name) {
>>> this.Name = Name;
>>> }
>>> public boolean isAbstract() {
>>> return Abstract;
>>> }
>>> public void setAbstract(boolean Abstract) {
>>> this.Abstract = Abstract;
>>> }
>>>
>>>@OneToMany(cascade=javax.persistence.CascadeType.ALL,mappedBy="ClassOwner")
>>>
>>> public List<Attribute> getAttributes() {
>>> return Attributes;
>>> }
>>> public void setAttributes(List<Attribute> Attributes) {
>>> this.Attributes = Attributes;
>>> }
>>> public void addAttribute(Attribute a) {
>>> Attributes.add(a);
>>> a.setClassOwner(this);
>>> }
>>> public Attribute newAttribute() {
>>> Attribute a = new Attribute();
>>> this.addAttribute(a);
>>> return a;
>>> }
>>> public Attribute getAttribute(long iID) {
>>> for (Attribute a:this.getAttributes()) {
>>> if (a.getId() == iID)
>>> return a;
>>> }
>>> return null;
>>> }
>>> public void removeAttribute(Attribute a) {
>>> Attributes.remove(a);
>>> a.setClassOwner(null);
>>> }
>>> }
>>>
>>>And a third class "Attribute".
>>>
>>>@Entity
>>>public class Attribute implements Serializable {
>>> private static final long serialVersionUID = 1L;
>>> private Long id;
>>> private String Name;
>>> private ClassDef ClassOwner;
>>> private Type Type;
>>> public Attribute() {
>>> }
>>> public void setId(Long id) {
>>> this.id = id;
>>> }
>>> @Id
>>> @GeneratedValue(strategy = GenerationType.AUTO)
>>> public Long getId() {
>>> return id;
>>> }
>>> @Column(nullable=false)
>>> public String getName() {
>>> return Name;
>>> }
>>> public void setName(String Name) {
>>> this.Name = Name;
>>> }
>>> @ManyToOne()
>>> @JoinColumn(nullable=false)
>>> public ClassDef getClassOwner() {
>>> return ClassOwner;
>>> }
>>> public void setClassOwner(ClassDef ClassOwner) {
>>> this.ClassOwner = ClassOwner;
>>> }
>>> @ManyToOne
>>> public Type getType() {
>>> return Type;
>>> }
>>> public void setType(Type Type) {
>>> if (Type == this.getClassOwner()) {
>>> //TODO Exception if an attribute is of the same type as his owner
>>> return;
>>> }
>>> this.Type = Type;
>>> }
>>>
>>>
>>> }
>>>
>>>The error message i get is:
>>>
>>>Internal Exception: Exception [TOPLINK-7154] (Oracle TopLink Essentials -
>>>2.0 (Build b47-beta3 (05/16/2007))):
>>>oracle.toplink.essentials.exceptions.ValidationException
>>>
>>>Exception Description: The attribute [attributes] in entity class [class
>>>org.JTSoft.POEM.BaseLib.ClassDef] has a mappedBy value of [ClassOwner]
>>>which does not exist in its owning entity class [class
>>>org.JTSoft.POEM.BaseLib.Attribute]. If the owning entity class is a
>>>@MappedSuperclass, this is invalid, and your attribute should reference
>>>the correct subclass.
>>>
>>> at
>>>oracle.toplink.essentials.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:229)
>>>
>>>I can't fix the problem. Where is the missing part of the puzzle?
>>>
>>>Kind regards
>>>
>>>Jürg
>>>
>>>
>>>-----------------------------------------------------------------------------------------------
>>>
>>>*dipl. Informatik-Ing. ETH Jürg Treichler*
>>>IT-Architekt
>>>
>>>Eidgenössisches Departement für Verteidigung,
>>>Bevölkerungsschutz und Sport VBS
>>>Generalsekretariat VBS
>>>Informatik VBS
>>>Maulbeerstrasse 9; 3003 Bern
>>>+41 (31) 324 73 42 (Tel.)
>>>+41 (31) 324 88 99 (Fax)
>>>_juerg.treichler_at_gs-vbs.admin.ch_
>>><mailto:juerg.treichler_at_gs-vbs.admin.ch>
>>>_www.vbs.admin.ch_ <file://www.vbs.admin.ch>
>>>-----------------------------------------------------------------------------------------------
>>>
>>>
>
>_________________________________________________________________
>Could you be the guest MSN Movies presenter? Click Here to Audition
>http://www.lightscameraaudition.co.uk
_________________________________________________________________
Txt a lot? Get Messenger FREE on your mobile.
https://livemessenger.mobile.uk.msn.com/