Update your entity as:
@Entity
public class Tradesman extends User{
@ManyToOne(optional=false)
private Company company;
*@PrePersist*
public void hashPassword(){
setPassword(BCrypt.hashpw(**entity.getPassword(), BCrypt.gensalt());
}
And then check where are you persisting Tradesman without company.
2013/5/21 Thomas Broyer <[email protected]>
>
>
> On Tuesday, May 21, 2013 11:18:42 AM UTC+2, Nermin wrote:
>>
>> Dear GWT developers,
>>
>> I have a "probably simple" problem with my application which I am
>> obviously not able to solve.
>>
>> Two Classes: Company, Tradesman
>>
>> @Entity
>> public class Company {
>> @OneToMany(cascade = CascadeType.ALL, mappedBy = "company")
>> private List<Tradesman> users = new ArrayList<Tradesman>();
>>
>> ....
>> }
>>
>>
>> @Entity
>> public class Tradesman extends User{
>> @ManyToOne
>> private Company company;
>>
>> *@PrePersist*
>> public void hashPassword(){
>> setPassword(BCrypt.hashpw(**entity.getPassword(),
>> BCrypt.gensalt());
>> }
>>
>> *JSR 303 validation on GWT is activated.*
>>
>> Here is the *error message:
>> *Detected attempt to establish Company(no-id-yet) as the parent of
>> Tradesman(356) but the entity identified by Tradesman(356) has already been
>> persisted without a parent. A parent cannot be established or changed once
>> an object has been persisted.
>>
>> My problem is obviously that when I change some parameters within the
>> Tradesman entity within the *@PrePersist* method, a new child entity is
>> created.
>> In case I do not touch any parameter, in the @PrePersist, everything
>> works fine.
>>
>> What am I doing wrong here?
>>
>
> You're not reaching the appropriate group ;-)
>
> I suppose you're using AppEngine (form what I know of JPA, I can't see a
> reason for that kind of message, unless you're using JPA on AppEngine), in
> which case you can ask for support on StackOverflow:
> https://developers.google.com/appengine/community
>
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