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Re: Cycle in relation one-to-many
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created by <a href="https://community.jboss.org/people/logandtr">logandtr</a> in <i>EJB3</i> - <a href="https://community.jboss.org/message/831819#831819">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi, the code is this:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>DB:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Persons(<span style="text-decoration: underline;">id</span>, name)</p><p>Phonenumbers(<span style="text-decoration: underline;">number</span>, id_persons) FK id_person references Persons(id)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Java code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-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;
    }
}</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">
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;
    }
}</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.app.dao;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.ejb.Stateless;</p><p>import javax.persistence.EntityManager;</p><p>import javax.persistence.PersistenceContext;</p><p>import javax.persistence.PersistenceContextType;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.apache.commons.logging.Log;</p><p>import org.apache.commons.logging.LogFactory;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.app.model.Phonenumbers;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Stateless</p><p>public class PhonenumbersHome {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private static final Log log = LogFactory.getLog(PhonenumbersHome.class);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @PersistenceContext(unitName="PhoneBook", type=PersistenceContextType.EXTENDED)</p><p>    private EntityManager entityManager;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void persist(Phonenumbers transientInstance) {</p><p>        log.debug("persisting Phonenumbers instance");</p><p>        try {</p><p>            entityManager.persist(transientInstance);</p><p>            log.debug("persist successful");</p><p>        } catch (RuntimeException re) {</p><p>            log.error("persist failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void remove(Phonenumbers persistentInstance) {</p><p>        log.debug("removing Phonenumbers instance");</p><p>        try {</p><p>            entityManager.remove(persistentInstance);</p><p>            log.debug("remove successful");</p><p>        } catch (RuntimeException re) {</p><p>            log.error("remove failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public Phonenumbers merge(Phonenumbers detachedInstance) {</p><p>        log.debug("merging Phonenumbers instance");</p><p>        try {</p><p>            Phonenumbers result = entityManager.merge(detachedInstance);</p><p>            log.debug("merge successful");</p><p>            return result;</p><p>        } catch (RuntimeException re) {</p><p>            log.error("merge failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public Phonenumbers findById(String id) {</p><p>        log.debug("getting Phonenumbers instance with id: " + id);</p><p>        try {</p><p>            Phonenumbers instance = entityManager.find(Phonenumbers.class, id);</p><p>            log.debug("get successful");</p><p>            return instance;</p><p>        } catch (RuntimeException re) {</p><p>            log.error("get failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.app.dao;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.ejb.Stateless;</p><p>import javax.persistence.EntityManager;</p><p>import javax.persistence.PersistenceContext;</p><p>import javax.persistence.PersistenceContextType;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.apache.commons.logging.Log;</p><p>import org.apache.commons.logging.LogFactory;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.app.model.Persons;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Stateless</p><p>public class PersonsHome {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private static final Log log = LogFactory.getLog(PersonsHome.class);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @PersistenceContext(unitName="PhoneBook", type=PersistenceContextType.EXTENDED)</p><p>    private EntityManager entityManager;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void persist(Persons transientInstance) {</p><p>        log.debug("persisting Persons instance");</p><p>        try {</p><p>            entityManager.persist(transientInstance);</p><p>            log.debug("persist successful");</p><p>        } catch (RuntimeException re) {</p><p>            log.error("persist failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void remove(Persons persistentInstance) {</p><p>        log.debug("removing Persons instance");</p><p>        try {</p><p>            entityManager.remove(persistentInstance);</p><p>            log.debug("remove successful");</p><p>        } catch (RuntimeException re) {</p><p>            log.error("remove failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public Persons merge(Persons detachedInstance) {</p><p>        log.debug("merging Persons instance");</p><p>        try {</p><p>            Persons result = entityManager.merge(detachedInstance);</p><p>            log.debug("merge successful");</p><p>            return result;</p><p>        } catch (RuntimeException re) {</p><p>            log.error("merge failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public Persons findById(Integer id) {</p><p>        log.debug("getting Persons instance with id: " + id);</p><p>        try {</p><p>            Persons instance = entityManager.find(Persons.class, id);</p><p>            log.debug("get successful");</p><p>            return instance;</p><p>        } catch (RuntimeException re) {</p><p>            log.error("get failed", re);</p><p>            throw re;</p><p>        }</p><p>    }</p><p>}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.app.ws;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import javax.ejb.EJB;</p><p>import javax.naming.Context;</p><p>import javax.naming.InitialContext;</p><p>import javax.ws.rs.PathParam;</p><p>import javax.ws.rs.Produces;</p><p>import javax.ws.rs.GET;</p><p>import javax.ws.rs.Path;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import com.app.dao.PersonsHome;</p><p>import com.app.model.Persons;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>@Path("/persons")</p><p>public class PersonsResources {</p><p>    </p><p>    @EJB</p><p>    private PersonsHome ph;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @GET()</p><p>    @Produces("application/json")</p><p>    @Path("/{id}")</p><p>    public Persons getPerson(@PathParam("id") int id) {</p><p>        try{</p><p>            Context cx = new InitialContext();</p><p>            ph = (PersonsHome)cx.lookup("java:module/PersonsHome");</p><p>        }catch(Exception e){</p><p>            e.printStackTrace();</p><p>        }</p><p>        return ph.findById(id);</p><p>    }</p><p>}{/code}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and this is the persistence.xml</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>on link: </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><a class="jive-link-external-small" href="http://localhost:8080/PhoneBook/persons/1" rel="nofollow" target="_blank">http://localhost:8080/PhoneBook/persons/1</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I aspect ad output like this:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>{"id":1,"name":"Roberto","phonenumberses":[{"number":"+01932932"......</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>but I've a cycle like this:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><blockquote class="jive-quote"><p>{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"<em>01932932","persons":{"id":1,"name":"Roberto","phonenumberses":[{"number":"</em>01932932","persons":</p></blockquote><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Anyone can halp me?</p></div>
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