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POCan't persist my objects
 

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  1. POCan't persist my objects
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    <p>here's is the problem <br/></p> <p>I have a java class Agence that has a <code>@ManytoOne</code> relationship with my class Reseau .</p> <p>there is my Agence code :</p> <pre><code>package ma.kafil.bank; import java.io.Serializable; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.ManyToOne; @Entity public class Agence implements Serializable{ private int idAgence; private String labelle; private Reseau reseau; public Agence(String labelle) { this.labelle = labelle; } public Agence() { } @ManyToOne public Reseau getReseau() { return reseau; } public void setReseau(Reseau reseau) { this.reseau = reseau; } @Id @GeneratedValue public int getIdAgence() { return idAgence; } public void setIdAgence(int idAgence) { this.idAgence = idAgence; } public String getLabelle() { return labelle; } public void setLabelle(String labelle) { this.labelle = labelle; } } </code></pre> <p>and my Reseau Class :</p> <pre><code> package ma.kafil.bank; import java.io.Serializable; import java.util.ArrayList; import java.util.Collection; import javax.persistence.CascadeType; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.OneToMany; @Entity public class Reseau implements Serializable{ private int idReseau; private String Libelle; private ArrayList&lt;Agence&gt; Agences = new ArrayList(); //Constructor without arguments public Reseau() { } public Reseau(String Libelle) { this.Libelle = Libelle; } public void ajouterAgence(Agence a){ Agences.add(a); } @Id @GeneratedValue public int getIdReseau() { return idReseau; } public void setIdReseau(int idReseau) { this.idReseau = idReseau; } public String getLibelle() { return Libelle; } public void setLibelle(String Libelle) { this.Libelle = Libelle; } @OneToMany(cascade={CascadeType.PERSIST, CascadeType.MERGE}, mappedBy="reseau") public Collection&lt;Agence&gt; getAgences() { return Agences; } public void setAgences(ArrayList&lt;Agence&gt; Agences) { this.Agences = Agences; } public void addAgence(Agence a){ this.Agences.add(a); } } </code></pre> <p>And Finally the main class : </p> <pre><code>package ma.kafil.bank; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; public class Main { public static void main(String [] args){ //Creating Entity Manager //persistence-unit name="test" EntityManagerFactory emf = Persistence.createEntityManagerFactory("test"); EntityManager em = emf.createEntityManager(); //beginning the transaction em.getTransaction().begin(); //Creating a new Reseau r with r.labbelle = "Centre" and r.id=1 Reseau r = new Reseau("Centre"); r.setIdReseau(1); //Creating a new Agence a Agence a = new Agence("Nom Agence"); a.setIdAgence(2); //adding a to my Reseau (What's the problem with that ?? ) r.addAgence(a); em.persist(r); a.setIdAgence(1990); a.setReseau(r); em.persist(a); em.getTransaction().commit(); //closing em and emf em.close(); emf.close(); } } </code></pre> <p>Here is the stack trace :</p> <pre><code>Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: ma.kafil.bank.Reseau at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:637) at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:226) at ma.kafil.bank.Main.main(Main.java:30) Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: ma.kafil.bank.Reseau at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:79) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:38) at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:618) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:592) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:596) at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:220) ... 1 more Java Result: 1 </code></pre> <p>And here is persistence.xml :</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"&gt; &lt;persistence-unit name="test" transaction-type="RESOURCE_LOCAL"&gt; &lt;provider&gt;org.hibernate.ejb.HibernatePersistence&lt;/provider&gt; &lt;class&gt; ma.kafil.bank.Agence&lt;/class&gt; &lt;class&gt; ma.kafil.bank.Reseau&lt;/class&gt; &lt;properties&gt; &lt;property name="hibernate.connection.username" value="root"/&gt; &lt;property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/&gt; &lt;property name="hibernate.connection.password" value=""/&gt; &lt;property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/awbawards"/&gt; &lt;property name="hibernate.hbm2ddl.auto" value="update"/&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <h1>Thanks in Advance</h1>
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    1. This table or related slice is empty.
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    1. USNumberTen
    1. USNumberTen
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    2. PO
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    1. COplease post stack trace
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    2. CONow I did , thanks
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    3. COPlease post persistence.xml, I believe there lays the problem. I think there is no persistence unit named "test" defined correctly
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      1. UScosmin.danisor
 

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