Dear Juan,
thank you for a fast reply.
Yes I would like to use unidirectional mapping, but in combination with
@PrePersist method at a child entity which changes one parameter value.
Here is my code:
@Entity
public class CompanyUD {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@org.datanucleus.api.jpa.annotations.Extension(vendorName =
"datanucleus", key = "gae.encoded-pk", value = "true")
private String id;
@OneToOne(cascade=CascadeType.ALL)
@JoinColumn(name="admin_user")
TradesmanUD adminUser;
private String name;
.. get / Set
}
@Entity
public class TradesmanUD {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@org.datanucleus.api.jpa.annotations.Extension(vendorName =
"datanucleus", key = "gae.encoded-pk", value = "true")
private String id;
private String name;
// @PrePersist
// public void myPrePers(){
// setName("Some different Name");
// }
.. get / set
}
// ====== My call:
private void testOneToOne() {
CompanyUD company = new CompanyUD();
company.setName("MyTest Company");
TradesmanUD user = new TradesmanUD();
user.setName("My test Admin");
company.setAdminUser(user);
EntityManager em = emfInstance.createEntityManager();
em.persist(company);
em.close();
}
The code above works fine without the @PrePersist method at TradesmanUD (UD
stays for unidirectional)
With @PrePersist in place i get the following ERROR:
*Detected attempt to establish CompanyUD(no-id-yet) as the parent of
TradesmanUD(52) but the entity identified by TradesmanUD(52) has already been
persisted without a parent. A parent cannot be established or changed once an
object has been persisted.*
I am using JPA with DataNucleus on Google Appengine.
Thank you for your help!
Nermin
Am Mittwoch, 5. Juni 2013 16:03:59 UTC+2 schrieb Juan Pablo Gardella:
>
> I've assumed you are trying to use unidirectional mapping. Check
> http://uaihebert.com/?p=1674&page=19
>
>
>
> 2013/6/5 Nermin <[email protected] <javascript:>>
>
>> Dear Juan, Dear GWT Group
>>
>> thank you very much for your help. I fixed most of my problems by
>> following your advice. All @OneToMany relations work fine after I made sure
>> the @ManyToOne relation is populated manually as you suggested.
>>
>> Unfortunately I cannot get @OneToOne relation running wen @PrePerist is
>> used on a child.
>>
>> My sample code is here:
>> https://dl.dropboxusercontent.com/u/2983671/JPA_Problem/JPA_Problem.zip
>>
>> Two Classes: CompanyX, TradesmanX
>> CompanyX stays in a OneToOne owned relation with TradesmanX
>> I use @PrePersist on TradesmanX in order to pre-set some fields before
>> the Object gets persisted in the DB.
>>
>> @Entity
>> public class CompanyX {
>> ...
>> @OneToOne(cascade=CascadeType.ALL)
>> private TradesmanX adminUser;
>> }
>>
>>
>> @Entity
>> public class TradesmanX {
>> ...
>> @PrePersist
>> public void myMethod(){
>> System.out.println("Pre Persist");
>> this.setFirstName("USER_XXXXX");
>> }
>> ...
>> }
>>
>> //Here is how I persist them within my test servlet:
>>
>> private void testPersistenceTwo() {
>>
>> CompanyX company = new CompanyX();
>> company.setName("my Comp");
>>
>> TradesmanX user = new TradesmanX();
>> user.setFirstName("Test_FName");
>> user.setLastName("Test_Lname");
>>
>> company.setAdminUser(user);
>> company.persist();
>> }
>>
>>
>> I am getting a similar error to the previous one:
>> javax.persistence.PersistenceException: Detected attempt to establish
>> CompanyX(no-id-yet) as the parent of TradesmanX(7) but the entity
>> identified by TradesmanX(7) has already been persisted without a parent. A
>> parent cannot be established or changed once an object has been persisted.
>>
>> Is there a solution for this?
>> Would it be possible to provide some working example?
>>
>> Thank you in advance:
>>
>> Nermin
>>
>>
>>
>>
>>
>> Am Donnerstag, 23. Mai 2013 15:09:41 UTC+2 schrieb Nermin:
>>>
>>> When I try to do that, I get a following error:
>>>
>>> java.lang.NullPointerException
>>> at
>>> com.google.appengine.**datanucleus.StoreFieldManager.**storeRelations(**StoreFieldManager.java:848)
>>> at
>>> com.google.appengine.**datanucleus.**DatastorePersistenceHandler.**insertObjectsInternal(**DatastorePersistenceHandler.**java:367)
>>> at
>>> com.google.appengine.**datanucleus.**DatastorePersistenceHandler.**insertObject(**DatastorePersistenceHandler.**java:218)
>>> at
>>> org.datanucleus.state.**JDOStateManager.**internalMakePersistent(**JDOStateManager.java:2377)
>>> at
>>> org.datanucleus.state.**JDOStateManager.flush(**JDOStateManager.java:3769)
>>> at
>>> org.datanucleus.state.**JDOStateManager.**getExternalObjectId(**JDOStateManager.java:1088)
>>> at
>>> org.datanucleus.state.**JDOStateManager.getObjectId(**JDOStateManager.java:958)
>>> at
>>> com.emajstor.server.**persistence.Company.**jdoGetObjectId(Company.java)
>>> at
>>> org.datanucleus.api.jpa.**JPAAdapter.getIdForObject(**JPAAdapter.java:272)
>>> at
>>> com.google.appengine.**datanucleus.EntityUtils.**getKeyForObject(EntityUtils.**java:245)
>>> at
>>> com.google.appengine.**datanucleus.EntityUtils.**getParentKey(EntityUtils.java:**853)
>>> at
>>> com.google.appengine.**datanucleus.StoreFieldManager.**establishEntityGroup(**StoreFieldManager.java:939)
>>> at
>>> com.google.appengine.**datanucleus.**DatastorePersistenceHandler.**insertObjectsInternal(**DatastorePersistenceHandler.**java:244)
>>> at
>>> com.google.appengine.**datanucleus.**DatastorePersistenceHandler.**insertObject(**DatastorePersistenceHandler.**java:218)
>>> at
>>> org.datanucleus.state.**JDOStateManager.**internalMakePersistent(**JDOStateManager.java:2377)
>>> at
>>> org.datanucleus.state.**JDOStateManager.flush(**JDOStateManager.java:3769)
>>> at
>>> org.datanucleus.**ObjectManagerImpl.**flushInternalWithOrdering(**ObjectManagerImpl.java:3884)
>>> at
>>> org.datanucleus.**ObjectManagerImpl.**flushInternal(**ObjectManagerImpl.java:3807)
>>> at
>>> org.datanucleus.**ObjectManagerImpl.flush(**ObjectManagerImpl.java:3747)
>>> at
>>> org.datanucleus.**ObjectManagerImpl.preCommit(**ObjectManagerImpl.java:4137)
>>> at
>>> org.datanucleus.**ObjectManagerImpl.**transactionPreCommit(**ObjectManagerImpl.java:428)
>>> at
>>> org.datanucleus.**TransactionImpl.**internalPreCommit(**TransactionImpl.java:400)
>>> at org.datanucleus.**TransactionImpl.commit(**TransactionImpl.java:288)
>>> at
>>> org.datanucleus.**ObjectManagerImpl.close(**ObjectManagerImpl.java:1090)
>>> at
>>> org.datanucleus.api.jpa.**JPAEntityManager.close(**JPAEntityManager.java:193)
>>> at com.emajstor.server.**persistence.Company.persist(**Company.java:110)
>>> at
>>> com.emajstor.server.test.**MyTestServlet.**testPersistenceOne(**MyTestServlet.java:74)
>>> at
>>> com.emajstor.server.test.**MyTestServlet.doGet(**MyTestServlet.java:39)
>>> at javax.servlet.http.**HttpServlet.service(**HttpServlet.java:617)
>>> at javax.servlet.http.**HttpServlet.service(**HttpServlet.java:717)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHolder.handle(**ServletHolder.java:511)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1166)
>>> at
>>> com.google.appengine.api.**socket.dev.DevSocketFilter.**doFilter(DevSocketFilter.java:**74)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1157)
>>> at
>>> com.google.appengine.tools.**development.**ResponseRewriterFilter.**doFilter(**ResponseRewriterFilter.java:**123)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1157)
>>> at
>>> com.google.appengine.tools.**development.**HeaderVerificationFilter.**doFilter(**HeaderVerificationFilter.java:**34)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1157)
>>> at
>>> com.google.appengine.api.**blobstore.dev.ServeBlobFilter.**doFilter(ServeBlobFilter.java:**61)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1157)
>>> at
>>> com.google.apphosting.utils.**servlet.**TransactionCleanupFilter.**doFilter(**TransactionCleanupFilter.java:**43)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1157)
>>> at
>>> com.google.appengine.tools.**development.StaticFileFilter.**doFilter(StaticFileFilter.**java:125)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1157)
>>> at
>>> com.google.appengine.tools.**development.**BackendServersFilter.doFilter(**BackendServersFilter.java:97)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler$CachedChain.**doFilter(ServletHandler.java:**1157)
>>> at
>>> org.mortbay.jetty.servlet.**ServletHandler.handle(**ServletHandler.java:388)
>>> at
>>> org.mortbay.jetty.security.**SecurityHandler.handle(**SecurityHandler.java:216)
>>> at
>>> org.mortbay.jetty.servlet.**SessionHandler.handle(**SessionHandler.java:182)
>>> at
>>> org.mortbay.jetty.handler.**ContextHandler.handle(**ContextHandler.java:765)
>>> at
>>> org.mortbay.jetty.webapp.**WebAppContext.handle(**WebAppContext.java:418)
>>> at
>>> com.google.appengine.tools.**development.**DevAppEngineWebAppContext.**handle(**DevAppEngineWebAppContext.**java:94)
>>> at
>>> org.mortbay.jetty.handler.**HandlerWrapper.handle(**HandlerWrapper.java:152)
>>> at
>>> com.google.appengine.tools.**development.**JettyContainerService$**ApiProxyHandler.handle(**JettyContainerService.java:**383)
>>> at
>>> org.mortbay.jetty.handler.**HandlerWrapper.handle(**HandlerWrapper.java:152)
>>> at org.mortbay.jetty.Server.**handle(Server.java:326)
>>> at
>>> org.mortbay.jetty.**HttpConnection.handleRequest(**HttpConnection.java:542)
>>> at
>>> org.mortbay.jetty.**HttpConnection$RequestHandler.**headerComplete(HttpConnection.**java:923)
>>> at org.mortbay.jetty.HttpParser.**parseNext(HttpParser.java:547)
>>> at org.mortbay.jetty.HttpParser.**parseAvailable(HttpParser.**java:212)
>>> at org.mortbay.jetty.**HttpConnection.handle(**HttpConnection.java:404)
>>> at
>>> org.mortbay.io.nio.**SelectChannelEndPoint.run(**SelectChannelEndPoint.java:**409)
>>> at
>>> org.mortbay.thread.**QueuedThreadPool$PoolThread.**run(QueuedThreadPool.java:582)
>>>
>>>
>>>
>>> Am Donnerstag, 23. Mai 2013 11:50:29 UTC+2 schrieb Juan Pablo Gardella:
>>>>
>>>> In the loop, do user.setCompany(company). You need a transaction.
>>>> Create it and do the commit.
>>>>
>>>>
>>>> 2013/5/23 Nermin <[email protected]>
>>>>
>>>>> Dear Juan,
>>>>>
>>>>> For this purpose I use the GWT-s Request Factory.
>>>>> However, in order to simplify the problem, I have created a server
>>>>> side persistence example using a simple servlet where one company and two
>>>>> users are created. Please have a look at the MyTestServlet.java within
>>>>> the
>>>>> Zip File.
>>>>>
>>>>> https://dl.dropboxusercontent.****com/u/2983671/JPA_Problem/JPA_****
>>>>> Problem.zip<https://dl.dropboxusercontent.com/u/2983671/JPA_Problem/JPA_Problem.zip>
>>>>>
>>>>> The funny thing is, I get now a different Eror:
>>>>>
>>>>> javax.persistence.**PersistenceException: Illegal argument
>>>>> ....
>>>>> Caused by: java.lang.**IllegalArgumentException: cross-group
>>>>> transaction need to be explicitly specified, see
>>>>> TransactionOptions.Builder.
>>>>> **withXGfound both Element {
>>>>> type: "Tradesman"
>>>>> id: 361
>>>>> }
>>>>> and Element {
>>>>> type: "Tradesman"
>>>>> id: 362
>>>>> }
>>>>>
>>>>> When I remove the @PrePersit from "User class" it works just fine!
>>>>> The Error pops up as soon as i modify a parameter on "Tradesman"
>>>>> entity (more exactly on its parent class "User").
>>>>>
>>>>> I really do not understand this behavior. ... I also must admit that I
>>>>> am not very advanced in JPA.
>>>>>
>>>>> Thank you for very much for your help.
>>>>>
>>>>> Best regards:
>>>>>
>>>>> Nermin
>>>>>
>>>>>
>>>>> Am Mittwoch, 22. Mai 2013 15:28:50 UTC+2 schrieb Juan Pablo Gardella:
>>>>>>
>>>>>> Show how you are persisting the entities.
>>>>>>
>>>>>>
>>>>>> 2013/5/22 Nermin <[email protected]>
>>>>>>
>>>>>>> Dear Alfredo and Juan,
>>>>>>>
>>>>>>> obviously there is an hidden problem with my code i simply do not
>>>>>>> see.
>>>>>>> Could you please have a short look at these 3 classes (full code)
>>>>>>> and tell me what am I doing wrong here:
>>>>>>>
>>>>>>> https://dl.dropboxusercontent.****com/u/2983671/JPA_Problem/JPA_****
>>>>>>> Problem.zip<https://dl.dropboxusercontent.com/u/2983671/JPA_Problem/JPA_Problem.zip>
>>>>>>>
>>>>>>> Please note: Everything works fine as log as I do not try to make
>>>>>>> any changes to the Tradesman entity (its parameters).
>>>>>>> When is set new password or any other parameter, i get an error
>>>>>>> message of type:
>>>>>>>
>>>>>>> Detected attempt to establish Company(no-id-yet) as the parent of
>>>>>>> Tradesman(358) but the entity identified by Tradesman(358) has already
>>>>>>> been
>>>>>>> persisted without a parent. A parent cannot be established or changed
>>>>>>> once
>>>>>>> an object has been persisted.
>>>>>>>
>>>>>>> I am using: JPA with DataNucleus on Google Datastore. (Standard
>>>>>>> setting that come with GWT 2.5)
>>>>>>>
>>>>>>> Thank you in advance for your help!!
>>>>>>>
>>>>>>> Best regards:
>>>>>>>
>>>>>>> Nermin
>>>>>>>
>>>>>>>
>>>>>>> Am Dienstag, 21. Mai 2013 18:29:54 UTC+2 schrieb Alfredo
>>>>>>> Quiroga-Villamil:
>>>>>>>>
>>>>>>>> Or use a cascade persist, merge to force creation or merge
>>>>>>>> respectively
>>>>>>>>
>>>>>>>> Sent from my iPhone
>>>>>>>>
>>>>>>>> On May 21, 2013, at 7:02 AM, Juan Pablo Gardella <
>>>>>>>> [email protected]> wrote:
>>>>>>>>
>>>>>>>> You should persist company before persist Tradesman or attach to
>>>>>>>> an existent company. This relation should be explicit. Create
>>>>>>>> company.addTrademan(Trademan t) method:
>>>>>>>>
>>>>>>>> company.addTrademan(Trademan t){
>>>>>>>> users.add(t);
>>>>>>>> t.setCompany(this);
>>>>>>>> }
>>>>>>>>
>>>>>>>> Call this in a transactional method.
>>>>>>>>
>>>>>>>> Juan
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> 2013/5/21 Nermin <[email protected]>
>>>>>>>>
>>>>>>>>> Dear Juan,
>>>>>>>>>
>>>>>>>>> I tried *@ManyToOne(optional=false)*, unfortunately no changes.
>>>>>>>>> In my current setting, the @PrePersist is called only once. (I see
>>>>>>>>> it on system out) That means: no multiple attempts to persist
>>>>>>>>> Tradesman
>>>>>>>>> entity.
>>>>>>>>>
>>>>>>>>> However, it looks to me that whenever I change parameters on the
>>>>>>>>> Tradesman entity JPA creates/persists for some reason the Tradesman
>>>>>>>>> in the
>>>>>>>>> DB, independently from the Company entity.
>>>>>>>>> I use Standard GWT settings: GWT 2.5, DataNucleus on Appengine
>>>>>>>>> Datastore.
>>>>>>>>>
>>>>>>>>> The scenario I am describing here is a standard scenario you will
>>>>>>>>> face when using GWT with JPA. I am surprised that my code is not
>>>>>>>>> working.
>>>>>>>>> @PrePersist works fine as long as the Entity is not in a owned
>>>>>>>>> relation with other entities.
>>>>>>>>>
>>>>>>>>> Does anyone has an idea what could be wrong here?
>>>>>>>>>
>>>>>>>>> Thank you!!
>>>>>>>>>
>>>>>>>>> Nermin
>>>>>>>>>
>>>>>>>>> @Thomas: Thank you for the advise. I will
>>>>>>>>>
>>>>>>>>> Am Dienstag, 21. Mai 2013 12:01:43 UTC+2 schrieb Juan Pablo
>>>>>>>>> Gardella:
>>>>>>>>>>
>>>>>>>>>> Update your entity as:
>>>>>>>>>>
>>>>>>>>>> @Entity
>>>>>>>>>> public class Tradesman extends User{
>>>>>>>>>> @ManyToOne(optional=false)
>>>>>>>>>> private Company company;
>>>>>>>>>>
>>>>>>>>>> *@PrePersist*
>>>>>>>>>> public void hashPassword(){
>>>>>>>>>> setPassword(BCrypt.hashpw(**enti********ty.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(**enti********ty.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://**develop******ers.google.com/**appengine/**commu****
>>>>>>>>>>> nity <https://developers.google.com/appengine/community>
>>>>>>>>>>>
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