logandtr [https://community.jboss.org/people/logandtr] created the discussion "Re: Cycle in relation one-to-many" To view the discussion, visit: https://community.jboss.org/message/831819#831819 -------------------------------------------------------------- Hi, the code is this: DB: Persons(id, name) Phonenumbers(number, id_persons) FK id_person references Persons(id) Java code: package com.app.model; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; import org.jboss.resteasy.annotations.providers.jaxb.JAXBConfig; @Entity @Table(name = "phonenumbers", catalog = "test") public class Phonenumbers implements java.io.Serializable {     private static final long serialVersionUID = -8122359598003938895L;     private String number;     private Persons persons;     public Phonenumbers() {     }     public Phonenumbers(String number) {         this.number = number;     }     public Phonenumbers(String number, Persons persons) {         this.number = number;         this.persons = persons;     }     @Id     @Column(name = "number", unique = true, nullable = false, length = 20)     public String getNumber() {         return this.number;     }     public void setNumber(String number) {         this.number = number;     }     @ManyToOne(fetch = FetchType.LAZY)     @JoinColumn(name = "id_person")     public Persons getPersons() {         return this.persons;     }     public void setPersons(Persons persons) {         this.persons = persons;     } } package com.app.model; import java.util.HashSet; import java.util.Set; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.FetchType; import javax.persistence.GeneratedValue; import static javax.persistence.GenerationType.IDENTITY; import javax.persistence.Id; import javax.persistence.OneToMany; import javax.persistence.Table; @Entity @Table(name = "persons", catalog = "test") public class Persons implements java.io.Serializable {     private static final long serialVersionUID = -3247756369663156186L;     private Integer id;     private String name;     private Set<Phonenumbers> phonenumberses = new HashSet<Phonenumbers>(0);     public Persons() {     }     public Persons(String name) {         this.name = name;     }     public Persons(String name, Set<Phonenumbers> phonenumberses) {         this.name = name;         this.phonenumberses = phonenumberses;     }     @Id     @GeneratedValue(strategy = IDENTITY)     @Column(name = "id", unique = true, nullable = false)     public Integer getId() {         return this.id;     }     public void setId(Integer id) {         this.id = id;     }     @Column(name = "name", nullable = false, length = 50)     public String getName() {         return this.name;     }     public void setName(String name) {         this.name = name;     }     @OneToMany(fetch = FetchType.LAZY, mappedBy = "persons")     public Set<Phonenumbers> getPhonenumberses() {         return this.phonenumberses;     }     public void setPhonenumberses(Set<Phonenumbers> phonenumberses) {         this.phonenumberses = phonenumberses;     } } package com.app.dao; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.PersistenceContextType; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.app.model.Phonenumbers; @Stateless public class PhonenumbersHome {     private static final Log log = LogFactory.getLog(PhonenumbersHome.class);     @PersistenceContext(unitName="PhoneBook", type=PersistenceContextType.EXTENDED)     private EntityManager entityManager;     public void persist(Phonenumbers transientInstance) {         log.debug("persisting Phonenumbers instance");         try {             entityManager.persist(transientInstance);             log.debug("persist successful");         } catch (RuntimeException re) {             log.error("persist failed", re);             throw re;         }     }     public void remove(Phonenumbers persistentInstance) {         log.debug("removing Phonenumbers instance");         try {             entityManager.remove(persistentInstance);             log.debug("remove successful");         } catch (RuntimeException re) {             log.error("remove failed", re);             throw re;         }     }     public Phonenumbers merge(Phonenumbers detachedInstance) {         log.debug("merging Phonenumbers instance");         try {             Phonenumbers result = entityManager.merge(detachedInstance);             log.debug("merge successful");             return result;         } catch (RuntimeException re) {             log.error("merge failed", re);             throw re;         }     }     public Phonenumbers findById(String id) {         log.debug("getting Phonenumbers instance with id: " + id);         try {             Phonenumbers instance = entityManager.find(Phonenumbers.class, id);             log.debug("get successful");             return instance;         } catch (RuntimeException re) {             log.error("get failed", re);             throw re;         }     } } package com.app.dao; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.PersistenceContextType; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.app.model.Persons; @Stateless public class PersonsHome {     private static final Log log = LogFactory.getLog(PersonsHome.class);     @PersistenceContext(unitName="PhoneBook", type=PersistenceContextType.EXTENDED)     private EntityManager entityManager;     public void persist(Persons transientInstance) {         log.debug("persisting Persons instance");         try {             entityManager.persist(transientInstance);             log.debug("persist successful");         } catch (RuntimeException re) {             log.error("persist failed", re);             throw re;         }     }     public void remove(Persons persistentInstance) {         log.debug("removing Persons instance");         try {             entityManager.remove(persistentInstance);             log.debug("remove successful");         } catch (RuntimeException re) {             log.error("remove failed", re);             throw re;         }     }     public Persons merge(Persons detachedInstance) {         log.debug("merging Persons instance");         try {             Persons result = entityManager.merge(detachedInstance);             log.debug("merge successful");             return result;         } catch (RuntimeException re) {             log.error("merge failed", re);             throw re;         }     }     public Persons findById(Integer id) {         log.debug("getting Persons instance with id: " + id);         try {             Persons instance = entityManager.find(Persons.class, id);             log.debug("get successful");             return instance;         } catch (RuntimeException re) {             log.error("get failed", re);             throw re;         }     } } package com.app.ws; import javax.ejb.EJB; import javax.naming.Context; import javax.naming.InitialContext; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.GET; import javax.ws.rs.Path; import com.app.dao.PersonsHome; import com.app.model.Persons; @Path("/persons") public class PersonsResources {     @EJB     private PersonsHome ph;     @GET()     @Produces("application/json")     @Path("/{id}")     public Persons getPerson(@PathParam("id") int id) {         try{             Context cx = new InitialContext();             ph = (PersonsHome)cx.lookup("java:module/PersonsHome");         }catch(Exception e){             e.printStackTrace();         }         return ph.findById(id);     } }{/code} and this is the persistence.xml on link: http://localhost:8080/PhoneBook/persons/1 http://localhost:8080/PhoneBook/persons/1 I aspect ad output like this: but I've a cycle like this: Anyone can halp me? -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/831819#831819] Start a new discussion in EJB3 at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]