Resending because of typo in address list.
Thanks,
-- markus.
Markus Fuchs wrote:
> Hi Martin,
>
> Your class definition looks ok. Maybe Tom or Peter can help.
>
> Thanks,
>
> -- markus.
>
> Martin Adamek wrote:
>
>> Hi all,
>>
>> I tried to create entity which can be recursively pointing to
>> instances of same type. I want to use it for representing product
>> categories navigation menu:
>>
>> - Computers
>> - Laptops
>> - Cables
>> - ...
>> - Cameras
>> - Digital
>> - Cards
>> - MMC
>> - SD
>> - XD
>> - ...
>>
>> Following entity I can use in Hibernate EM in J2SE without problems
>> but on GlassFish I am experiencing problems on deployment (see below).
>>
>> Entity:
>> ---%<---
>> package foo.entity;
>> import java.util.ArrayList;
>> import java.util.List;
>> import javax.persistence.*;
>>
>> @Entity
>> public class Category {
>> private Long id;
>> private String name;
>> private Category parent;
>> private List<Category> children;
>>
>> public Category() {
>> children = new ArrayList();
>> }
>>
>> @Id(generate = GeneratorType.AUTO)
>> public Long getId() {
>> return id;
>> }
>>
>> public void setId(Long id) {
>> this.id = id;
>> }
>>
>> public String getName() {
>> return name;
>> }
>>
>> public void setName(String name) {
>> this.name = name;
>> }
>>
>> @ManyToOne()
>> public Category getParent() {
>> return parent;
>> }
>>
>> public void setParent(Category parent) {
>> this.parent = parent;
>> }
>>
>> @OneToMany(mappedBy="parent", cascade={CascadeType.ALL})
>> public List<Category> getChildren() {
>> return children;
>> }
>>
>> public void setChildren(List<Category> children) {
>> this.children = children;
>> }
>> }
>> ---%<---
>>
>> GlassFish exceptions:
>> ---%<---
>> Exception [TOPLINK-48] (Oracle TopLink Essentials - 10g release 4
>> (10.1.4.0.0) (Build 051215Dev)):
>> oracle.toplink.essentials.exceptions.DescriptorException
>> Exception Description: Multiple writable mappings exist for the field
>> [CATEGORY.ID]. Only one may be defined as writable, all others must
>> be specified read-only.
>> Mapping: oracle.toplink.essentials.mappings.OneToOneMapping[parent]
>> Descriptor: RelationalDescriptor(foo.entity.Category -->
>> [DatabaseTable(CATEGORY)])
>> ---%<---
>>
>> Any idea, what's the problem?
>>
>> -M
>
>
>