Problem with TABLE_PER_CLASS inheritance strategy
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Problem with TABLE_PER_CLASS inheritance strategy
by Daniel Le Berre
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Hi,
I was trying the various inheritance strategies on a very simple example: Employe extends MyCustomer extends Person JOINED and SINGLE_TABLE strategies work fine with default options, but using TABLE_PER_CLASS, I got the following exception: Exception in thread "Thread-48" javax.persistence.PersistenceException: org.hibernate.MappingException: Cannot use identity column key generation with <union-subclass> mapping for: ili.sem4.Employe at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:720) at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127) at org.objectweb.easybeans.persistence.JPersistenceContext.init(JPersistenceContext.java:72) at org.objectweb.easybeans.persistence.JPersistenceContext.<init>(JPersistenceContext.java:65) at org.objectweb.easybeans.persistence.PersistenceUnitManager.<init>(PersistenceUnitManager.java:60) at org.objectweb.easybeans.persistence.xml.PersistenceXmlFileAnalyzer.analyzePersistenceXmlFile(PersistenceXmlFileAnalyzer.java:139) at org.objectweb.easybeans.container.JContainer3.start(JContainer3.java:254) at org.objectweb.easybeans.server.ContainersMonitor.checkContainer(ContainersMonitor.java:226) at org.objectweb.easybeans.server.ContainersMonitor.run(ContainersMonitor.java:120) Caused by: org.hibernate.MappingException: Cannot use identity column key generation with <union-subclass> mapping for: ili.sem4.Employe at org.hibernate.persister.entity.UnionSubclassEntityPersister.<init>(UnionSubclassEntityPersister.java:67) at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:61) at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:713) ... 8 more I haven't found much details in the EJB 3.0 persistence specification. I use MySQL as a backend. I am wondering if it is a database specific issue ? Please find below the code on my entities (from Enterprise JavaBeans 3.0 5th edition). Daniel @Entity @Inheritance(strategy=InheritanceType.TABLE_PER_CLASS) // @DiscriminatorColumn(name="DISCRIMINATOR",discriminatorType=DiscriminatorType.CHAR) // @DiscriminatorValue("P") public class Person { private int id; private String firstName; private String lastName; @Id @GeneratedValue public int getId() { return id; } public void setId(int id) { this.id = id; } public String getFirstName() { return this.firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } } @Entity //@DiscriminatorValue("C") public class MyCustomer extends Person { private String street; private String city; private String state; private String zip; public String getCity() { return city; } public void setCity(String city) { this.city = city; } public String getState() { return state; } public void setState(String state) { this.state = state; } public String getStreet() { return street; } public void setStreet(String street) { this.street = street; } public String getZip() { return zip; } public void setZip(String zip) { this.zip = zip; } } @Entity //@DiscriminatorValue("E") public class Employe extends MyCustomer { private int employeId; public int getEmployeId() { return employeId; } public void setEmployeId(int employeId) { this.employeId = employeId; } } -- You receive this message as a subscriber of the easybeans@... mailing list. To unsubscribe: mailto:easybeans-unsubscribe@... For general help: mailto:sympa@...?subject=help ObjectWeb mailing lists service home page: http://www.objectweb.org/wws |
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Re: Problem with TABLE_PER_CLASS inheritance strategy
by benoitf
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Hi Daniel,
I think you should look at @MappedSuperClass annotation. Best Regards, Florent Daniel Le Berre wrote: Hi, -- You receive this message as a subscriber of the easybeans@... mailing list. To unsubscribe: mailto:easybeans-unsubscribe@... For general help: mailto:sympa@...?subject=help ObjectWeb mailing lists service home page: http://www.objectweb.org/wws |
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Re: Problem with TABLE_PER_CLASS inheritance strategy
by Daniel Le Berre
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 Hi Florent, Florent BENOIT a écrit : > Hi Daniel, > > I think you should look at @MappedSuperClass annotation. I do not think so. @MappedSuperClass is for non entity classes. http://java.sun.com/javaee/5/docs/api/javax/persistence/MappedSuperclass.html I would like Person to be an entity. It looks like an implementation problem. Maybe I should use another persistence framework to see if it works file. I noticed an openjpa persistence provider in the examples persistence.xml file. How can I activate it in easybeans? Daniel > Best Regards, > > Florent > > Daniel Le Berre wrote: >> Hi, >> >> I was trying the various inheritance strategies on a very simple example: >> Employe extends MyCustomer extends Person >> >> JOINED and SINGLE_TABLE strategies work fine with default options, >> but using TABLE_PER_CLASS, I got the following exception: >> >> Exception in thread "Thread-48" >> javax.persistence.PersistenceException: >> org.hibernate.MappingException: Cannot use identity column key >> generation with <union-subclass> mapping for: ili.sem4.Employe >> at >> org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:720) >> >> at >> org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127) >> >> at >> org.objectweb.easybeans.persistence.JPersistenceContext.init(JPersistenceContext.java:72) >> >> at >> org.objectweb.easybeans.persistence.JPersistenceContext.<init>(JPersistenceContext.java:65) >> >> at >> org.objectweb.easybeans.persistence.PersistenceUnitManager.<init>(PersistenceUnitManager.java:60) >> >> at >> org.objectweb.easybeans.persistence.xml.PersistenceXmlFileAnalyzer.analyzePersistenceXmlFile(PersistenceXmlFileAnalyzer.java:139) >> >> at >> org.objectweb.easybeans.container.JContainer3.start(JContainer3.java:254) >> at >> org.objectweb.easybeans.server.ContainersMonitor.checkContainer(ContainersMonitor.java:226) >> >> at >> org.objectweb.easybeans.server.ContainersMonitor.run(ContainersMonitor.java:120) >> >> Caused by: org.hibernate.MappingException: Cannot use identity column >> key generation with <union-subclass> mapping for: ili.sem4.Employe >> at >> org.hibernate.persister.entity.UnionSubclassEntityPersister.<init>(UnionSubclassEntityPersister.java:67) >> >> at >> org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:61) >> >> at >> org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:226) >> at >> org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1291) >> >> at >> org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:713) >> >> ... 8 more >> >> I haven't found much details in the EJB 3.0 persistence specification. >> >> I use MySQL as a backend. I am wondering if it is a database specific >> issue ? >> >> Please find below the code on my entities (from Enterprise JavaBeans >> 3.0 5th edition). >> >> Daniel >> >> @Entity >> @Inheritance(strategy=InheritanceType.TABLE_PER_CLASS) >> // >> @DiscriminatorColumn(name="DISCRIMINATOR",discriminatorType=DiscriminatorType.CHAR) >> >> // @DiscriminatorValue("P") >> public class Person { >> >> private int id; >> >> private String firstName; >> >> private String lastName; >> >> @Id >> @GeneratedValue >> public int getId() { >> return id; >> } >> >> public void setId(int id) { >> this.id = id; >> } >> >> public String getFirstName() { >> return this.firstName; >> } >> >> public void setFirstName(String firstName) { >> this.firstName = firstName; >> } >> >> public String getLastName() { >> return lastName; >> } >> >> public void setLastName(String lastName) { >> this.lastName = lastName; >> } >> } >> >> >> @Entity >> //@DiscriminatorValue("C") >> public class MyCustomer extends Person { >> >> private String street; >> >> private String city; >> >> private String state; >> >> private String zip; >> >> public String getCity() { >> return city; >> } >> >> public void setCity(String city) { >> this.city = city; >> } >> >> public String getState() { >> return state; >> } >> >> public void setState(String state) { >> this.state = state; >> } >> >> public String getStreet() { >> return street; >> } >> >> public void setStreet(String street) { >> this.street = street; >> } >> >> public String getZip() { >> return zip; >> } >> >> public void setZip(String zip) { >> this.zip = zip; >> } >> >> } >> >> @Entity >> //@DiscriminatorValue("E") >> public class Employe extends MyCustomer { >> >> private int employeId; >> >> public int getEmployeId() { >> return employeId; >> } >> >> public void setEmployeId(int employeId) { >> this.employeId = employeId; >> } >> >> } >> >> >> ------------------------------------------------------------------------ >> >> >> -- >> You receive this message as a subscriber of the easybeans@... mailing list. >> To unsubscribe: mailto:easybeans-unsubscribe@... >> For general help: mailto:sympa@...?subject=help >> ObjectWeb mailing lists service home page: http://www.objectweb.org/wws >> > > > ------------------------------------------------------------------------ > > > -- > You receive this message as a subscriber of the easybeans@... mailing list. > To unsubscribe: mailto:easybeans-unsubscribe@... > For general help: mailto:sympa@...?subject=help > ObjectWeb mailing lists service home page: http://www.objectweb.org/wws - -- Daniel Le Berre mailto:leberre@... MCF, CRIL-CNRS FRE 2499, Universite d'Artois http://www.cril.univ-artois.fr/~leberre -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) Comment: Using GnuPG with Mandriva - http://enigmail.mozdev.org iD8DBQFFw0sKqVioN+Yc2ggRAozFAKC1Ghsk3Jwl2g3P8cR9HBBtnkzhGwCeO/95 iPej7/jmXuWQq6vWfXuWLWo= =Bmtn -----END PGP SIGNATURE----- -- You receive this message as a subscriber of the easybeans@... mailing list. To unsubscribe: mailto:easybeans-unsubscribe@... For general help: mailto:sympa@...?subject=help ObjectWeb mailing lists service home page: http://www.objectweb.org/wws |
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Re: Problem with TABLE_PER_CLASS inheritance strategy
by benoitf
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Sorry, I didn't see that you provided a java source code at the end of the file. You have to change the strategy used on the primary key field: @Id @GeneratedValue(strategy=GenerationType.TABLE) public int getId() { return id; } Also, note that TABLE_PER_CLASS is optional in the specification. Some vendors may not implement it. Regards, Florent Daniel Le Berre wrote: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Florent, Florent BENOIT a écrit : -- You receive this message as a subscriber of the easybeans@... mailing list. To unsubscribe: mailto:easybeans-unsubscribe@... For general help: mailto:sympa@...?subject=help ObjectWeb mailing lists service home page: http://www.objectweb.org/wws |
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Re: Problem with TABLE_PER_CLASS inheritance strategy
by Daniel Le Berre
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Rate this Message:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 Florent BENOIT a écrit : > Hi Daniel, > > Sorry, I didn't see that you provided a java source code at the end of > the file. > You have to change the strategy used on the primary key field: > > @Id > @GeneratedValue(strategy=GenerationType.TABLE) > public int getId() { > return id; > } > Also, note that TABLE_PER_CLASS is optional in the specification. Some > vendors may not implement it. ok, thanks for the information. Daniel > Regards, > > Florent > > Daniel Le Berre wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> Hi Florent, >> >> Florent BENOIT a écrit : >> >>> Hi Daniel, >>> >>> I think you should look at @MappedSuperClass annotation. >>> >> >> I do not think so. @MappedSuperClass is for non entity classes. >> http://java.sun.com/javaee/5/docs/api/javax/persistence/MappedSuperclass.html >> >> I would like Person to be an entity. >> >> It looks like an implementation problem. >> >> Maybe I should use another persistence framework to see if it works file. >> >> I noticed an openjpa persistence provider in the examples >> persistence.xml file. How can I activate it in easybeans? >> >> Daniel > > > ------------------------------------------------------------------------ > > > -- > You receive this message as a subscriber of the easybeans@... mailing list. > To unsubscribe: mailto:easybeans-unsubscribe@... > For general help: mailto:sympa@...?subject=help > ObjectWeb mailing lists service home page: http://www.objectweb.org/wws - -- Daniel Le Berre mailto:leberre@... MCF, CRIL-CNRS FRE 2499, Universite d'Artois http://www.cril.univ-artois.fr/~leberre -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) Comment: Using GnuPG with Mandriva - http://enigmail.mozdev.org iD8DBQFFw1dbqVioN+Yc2ggRAhj0AJ0UMqlcTPQUZCjJnwUpvH5u7SWzqACfXhTm /BTIF1kpJcIhDbwbva2qWHg= =Onvn -----END PGP SIGNATURE----- -- You receive this message as a subscriber of the easybeans@... mailing list. To unsubscribe: mailto:easybeans-unsubscribe@... For general help: mailto:sympa@...?subject=help ObjectWeb mailing lists service home page: http://www.objectweb.org/wws |
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