I'm new with hibernate, after writing my entities, hibernate says that it cannot locate the getters and setters. I got one error at the time, like :
Exception in thread "main" org.hibernate.PropertyNotFoundException: Could not locate getter method for property [entites.Foret#idForet]
at lanceur.Test.main(Test.java:43)
Here is my cfg.xml :
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="entites.Foret" table="FORET">
<id name="idForet" type="long" column="idForet">
<generator class="increment" />
</id>
<set name = "emplacement_arbre" table ="ARBRE" lazy ="true" fetch = "select" cascade ="save-update, delete">
<key column = "idForet"/>
<one-to-many class ="entites.Arbre"/>
</set>
<property name="taille_foret" />
<!--<property name="coordonnees" /> -->
<property name="ville" />
<property name="matricule" />
<property name="nom" />
</class>
</hibernate-mapping>
And my foret.hbm.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.bytecode.use_reflection_optimizer">false</property>
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<!-- <property name="hibernate.connection.datasource">jdbc/voteo</property>-->
<property name="hibernate.connection.password">mdp</property>
<property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/Laforet</property>
<property name="hibernate.connection.username">postgres</property>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="show_sql">true</property>
<property name="format_sql">false</property>
<property name="hibernate.connection.autocommit">false</property>
<property name="hibernate.connection.release_mode">after_transaction</property>
<mapping resource="utilisateur.hbm.xml" />
<mapping resource="foret.hbm.xml" />
<mapping resource="arbre.hbm.xml" />
<mapping resource="adresse.hbm.xml" />
</session-factory>
</hibernate-configuration>
Also my java entity:
package entites;
import java.util.List;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
#Entity
#Table(name = "FORET")
public class Foret {
#GeneratedValue
#Id
private Long idForet;
#OneToMany(mappedBy = "Foret")
private List<Arbre> emplacement_arbre;
private int taille_foret;
private double[] coordonnees;
private String ville;
private String matricule;
private String nom;
public List<Arbre> getEmplacement_arbre() {
return emplacement_arbre;
}
public void setEmplacement_arbre(List<Arbre> emplacement_arbre) {
this.emplacement_arbre = emplacement_arbre;
}
public int getTaille_foret() {
return taille_foret;
}
public void setTaille_foret(int taille_foret) {
this.taille_foret = taille_foret;
}
public Long getIdForet() {
return idForet;
}
public void setIdForet(Long idForet) {
this.idForet = idForet;
}
public double[] getCoordonnees() {
return coordonnees;
}
public void setCoordonnees(double[] coordonnees) {
this.coordonnees = coordonnees;
}
public String getMatricule() {
return matricule;
}
public void setMatricule(String matricule) {
this.matricule = matricule;
}
public String getNom() {
return nom;
}
public void setNom(String nom) {
this.nom = nom;
}
#Override
public String toString() {
return "Foret [emplacement_arbre=" + emplacement_arbre + ", taille_foret=" + taille_foret + ", id=" + idForet
+ ", nom=" + nom + "]";
}
public String getVille() {
return ville;
}
public void setVille(String ville) {
this.ville = ville;
}
}
I checked my javabean naming convention and it seems correct.
Any suggestions ?
Related
package com.simpleprogrammer;
import org.hibernate.Session;
public class Program {
public static void main(String[] args) {
System.out.println("HEY");
Session session = HibernateUtilities.getSessionFactory().openSession();
session.beginTransaction();
User user = new User();
user.setName("pallavi");
user.setGoal(100);
session.getTransaction().commit();
session.close();
HibernateUtilities.getSessionFactory().close();
}
User.java
package com.simpleprogrammer;
public class User {
private int id;
private String name;
private int total;
private int goal;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public int getGoal() {
return goal;
}
public void setGoal(int goal) {
this.goal = goal;
}
}
HibernateUtilities.java
package com.simpleprogrammer;
import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtilities {
private static SessionFactory sessionFactory;
private static StandardServiceRegistry serviceRegistry;
static{
try{
Configuration configuration = new Configuration().configure();
serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
}
catch(HibernateException exception){
System.out.println("Problem creating session factory");
exception.printStackTrace();
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
/*
public static void setSessionFactory(SessionFactory sessionFactory) {
HibernateUtilities.sessionFactory = sessionFactory;
} */
}
Hibernate config file :-----------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.default_schema">protein_tracker</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<property name="hibernate.generate_statistics">false</property>
<mapping resource="com/simpleprogrammer/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>
User mapping file-----------------------
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 1 May, 2017 12:09:45 PM by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
<class name="com.simpleprogrammer.User" table="USERS">
<id name="id" type="int">
<column name="ID" />
<generator class="identity" />
</id>
<property name="name" type="java.lang.String">
<column name="NAME" />
</property>
<property name="total" type="int">
<column name="TOTAL" />
</property>
<property name="goal" type="int">
<column name="GOAL" />
</property>
</class>
</hibernate-mapping>
Everything is working fine but data is not getting stored in database, i dont understand what is wrong!
You create the User entity, but you do not tell the persistence provider to actually manage it and eventually physically store it in the database:
User user = new User();
user.setName("pallavi");
user.setGoal(100);
session.persist(user);
Alternatively you can use save method.
This is the case when creating a new entity. If you were to update an existing entity, which you queries within the same transaction, then you would not need to explicitly call the update or merge operation as the persistence provider would do that for you implicitly on transaction commit.
I am learning hibernate and I can't figure out why is this error popping up. I tried searching but I couldn't find a solution that helped me. I'd like to learn why am I getting this error.
Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.simpleprogrammer.User
at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1451)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:100)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:678)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:670)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:665)
at Program.main(Program.java:23)
Please help I have already wasted so many hours debugging this.
Here is my simple program,
Program.java
import org.hibernate.Session;
import com.simpleprogrammer.HibernateUtilities;
import com.simpleprogrammer.User;
public class Program {
/**
* #param args
* #throws ClassNotFoundException
* #throws SQLException
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("Hello World");
Session session = HibernateUtilities.getSessionFactory().openSession();
session.beginTransaction();
User user = new User();
user.setName("Deepak");
user.setTotal(130);
user.setGoal(150);
session.save(user);
session.getTransaction().commit();
session.close();
}
}
HibernateUtilities.java
package com.simpleprogrammer;
import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class HibernateUtilities {
public static SessionFactory sessionFactory;
public static ServiceRegistry serviceRegistry;
static{
try{
Configuration configuation = new Configuration().configure();
serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuation.getProperties()).build();
sessionFactory = configuation.buildSessionFactory(serviceRegistry);
}catch(HibernateException e){
System.out.println("Error while creating Session Factory.");
e.printStackTrace();
}
}
public static SessionFactory getSessionFactory(){
return sessionFactory;
}
}
User.java
package com.simpleprogrammer;
public class User {
private int id;
private String name;
private int total;
private int goal;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getTotal() {
return total;
}
public void setTotal(int total) {
this.total = total;
}
public int getGoal() {
return goal;
}
public void setGoal(int goal) {
this.goal = goal;
}
}
User.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Oct 28, 2015 8:05:49 PM by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="com.simpleprogrammer.User" table="users">
<id name="id" type="int">
<column name="id" />
<generator class="identity" />
</id>
<property name="name" type="java.lang.String">
<column name="name" />
</property>
<property name="total" type="int">
<column name="total" />
</property>
<property name="goal" type="int">
<column name="goal" />
</property>
</class>
</hibernate-mapping>
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.default_schema">protein_tracker</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping resource="com/simpleprogrammer/User.hbm.xml" />
</session-factory>
Actually I was using Hibernate 5 jars . But the tutorial is actually for Hibernate 4. When I used Hibernate 4 jars everything seems to working fine.
May be you don't need <mapping resource="com/simpleprogrammer/User.hbm.xml" />. Instead, try <mapping resource="User.hbm.xml" />
I am getting " org.hibernate.PropertyAccessException" due to null values in my database table. How to handle the exception?
My files are
FetchTest.java
package com.raj.java.hiberanteDemos;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class FetchTest {
public static void main(String[] args) {
Configuration cfg=new Configuration().configure("hibernate.cfg.xml");
SessionFactory factory=cfg.buildSessionFactory();
Session session1=factory.openSession();
Employee emp1=(Employee)session1.get(Employee.class,7839);
System.out.println(emp1.getEmpno()+" "+emp1.getEname()+" "+emp1.getSal());
session1.close();
Session session2=factory.openSession();
Employee emp2=(Employee)session2.load(Employee.class,7839);
System.out.println(emp2.getEmpno()+" "+emp2.getEname()+" "+emp2.getSal());
session2.close();
}
}
Employee.java
package com.raj.java.hiberanteDemos;
import java.sql.Date;
class Employee {
private int empno, mgr, deptnumber;
private String ename, job;
private double sal, comm;
private Date hiredate;
public int getEmpno() {
return empno;
}
public void setEmpno(int empno) {
this.empno = empno;
}
public int getMgr() {
return mgr;
}
public void setMgr(int mgr) {
this.mgr = mgr;
}
public int getDeptnumber() {
return deptnumber;
}
public void setDeptnumber(int deptnumber) {
this.deptnumber = deptnumber;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public double getComm() {
return comm;
}
public void setComm(double comm) {
this.comm = comm;
}
public Date getHiredate() {
return hiredate;
}
public void setHiredate(Date hiredate) {
this.hiredate = hiredate;
}
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
public double getSal() {
return sal;
}
public void setSal(double sal) {
this.sal = sal;
}
}
hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hbm2ddl.auto">update</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect
</property>
<property name="connection.url">someValidurl</property>
<property name="connection.username">username</property>
<property name="connection.password">password</property>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.show_sql">true</property>
<property name="cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
<property name="hibernate.cache.use_second_level_cache">true</property>
<mapping resource="employee.hbm.xml"></mapping>
</session-factory>
</hibernate-configuration>
employee.hbm.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!-- <class name="com.javatpoint.mypackage.Employee" table="employee"> <id
name="empid"> <generator class="assigned"></generator> </id> <property name="firstName"></property>
<property name="lastName"></property> </class> -->
<class name="com.raj.java.hiberanteDemos.Employee" table="emp">
<id name="empno" type="int" column="EMPNO">
<generator class="increment" />
</id>
<property name="ename" type="java.lang.String" />
<property name="mgr" type="int" />
<property name="deptnumber" type="int" column="deptno" />
<property name="job" type="java.lang.String" />
<property name="sal" type="double" />
<property name="comm" type="double" />
<property name="hiredate" type="java.sql.Date" />
</class>
</hibernate-mapping>
When I ran this application I am getting below error message.
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select employee0_.EMPNO as EMPNO0_0_, employee0_.ename as ename0_0_, employee0_.mgr as mgr0_0_, employee0_.deptno as deptno0_0_, employee0_.job as job0_0_, employee0_.sal as sal0_0_, employee0_.comm as comm0_0_, employee0_.hiredate as hiredate0_0_ from emp employee0_ where employee0_.EMPNO=?
Exception in thread "main" org.hibernate.PropertyAccessException: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of com.raj.java.hiberanteDemos.Employee.setMgr
at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValuesWithOptimizer(PojoEntityTuplizer.java:215)
at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValues(PojoEntityTuplizer.java:185)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues(AbstractEntityPersister.java:3232)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:129)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:842)
at org.hibernate.loader.Loader.doQuery(Loader.java:717)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1785)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:47)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:41)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:2730)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:365)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:346)
at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:123)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:177)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)
at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)
at org.hibernate.impl.SessionImpl.get(SessionImpl.java:799)
at org.hibernate.impl.SessionImpl.get(SessionImpl.java:792)
at com.raj.java.hiberanteDemos.FetchTest.main(FetchTest.java:13)
Caused by: net.sf.cglib.beans.BulkBeanException
at com.raj.java.hiberanteDemos.Employee$$BulkBeanByCGLIB$$142cfd75.setPropertyValues(<generated>)
at org.hibernate.tuple.PojoEntityTuplizer.setPropertyValuesWithOptimizer(PojoEntityTuplizer.java:212)
... 19 more
Caused by: java.lang.NullPointerException
... 21 more
my emp table data
when I update all the null values with 0 or some other values its working fine.
Please help me in solving the error without updating null values in database table.
Thanks in Advance,
Raj
I would personally recommend to actually "clean" the database values, maybe setting the column not nullable.
But if this can't be done, what you can do is modify your setters, so that it checks for null:
public void setComm(Double comm) {
if(null != comm){
this.comm = comm;
}else{
this.comm = 0;
}
}
hope this helps
Your mgr-Property is int, which does not allow null. Change it to Integer, which allows null. Or make a default value for your mgr column.
The best way to avoid Hibernate's attempts at setting null values to primitives is to use Wrapper classes (Integer, Long, Double...); and especially, if you need to tack on a column or 2 to an existing table. Auto-boxing is your friend.
HI i am getting this error ..tried a lott but have nt been able to find a solution. Can anyone please help me ....you can find the error from this link https://drive.google.com/file/d/0BxEeexgXf53PQ1JqZWQ4SEloSjg/view?usp=sharing
hibernate.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class catalog="user" name="beans.UserDetail" table="USERS"/>
<id column="ID" name="id" type="java.lang.Integer">
<generator class="assigned"/>
</id>
<property column="UNAME" name="uname" type="string"/>
<property column="PWORD" name="pword" type="string"/>
</hibernate-mapping>
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.DerbyDialect</property>
<property name="hibernate.connection.driver_class">org.apache.derby.jdbc.ClientDriver</property>
<property name="hibernate.connection.url">jdbc:derby://localhost:1527/dbtest </property>
<property name="hibernate.connection.username">root</property>
<property name="connection.password">pass</property>
<property name="hibernate.connection.autocommit">false</property>
<property name="current_session_context_class">thread</property>
<property name = "show_sql">true</property>
<property name = "format_sql">true</property>
<property name = "hibernate.transaction.factory_class">org.hibernate.testing.cache.CachingRegionFactory
</property>
<property name = "hibernate.hbm2ddl.auto">create</property>
<mapping resource="config/hibernate.hbm.xml"></mapping>
<mapping class = "beans/insert"></mapping>
</session-factory>
</hibernate-configuration>
userdetail.java
package beans;
import javax.persistence.Entity;
import javax.persistence.Id;
#Entity
public class UserDetail {
#Id private int id;
String uname;
String pword;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getPword() {
return pword;
}
public void setPword(String pword) {
this.pword = pword;
}
}
insert.java
package beans;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class insert {
public static void main(String[] args){
SessionFactory sf = (SessionFactory) new Configuration().configure("config/hibernate.cfg.xml").buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
UserDetail user1 = new UserDetail();
user1.setId(7);
user1.setUname("testUser");
user1.setPword("testPassword");
session.save(user1);
session.getTransaction().commit();
}
}
You closed the <class> tag. Try this
<class catalog="user" name="beans.UserDetail" table="USERS">
<id column="ID" name="id" type="java.lang.Integer">
<generator class="assigned"/>
</id>
<property column="UNAME" name="uname" type="string"/>
<property column="PWORD" name="pword" type="string"/>
</class>
i have a hibernate error wich sais :
15:32:48,554 DEBUG SQL:111 - insert into apurement.user (groupe_id, username, password, email) values (?, ?, ?, ?)
15:32:48,664 WARN JDBCExceptionReporter:100 - SQL Error: 1452, SQLState: 23000
15:32:48,664 ERROR JDBCExceptionReporter:101 -
Cannot add or update a child row: a foreign key constraint fails (apurement.user,
CONSTRAINT groupe_id FOREIGN KEY (groupe_id) REFERENCES groupe (groupe_id)
ON DELETE NO ACTION ON UPDATE NO ACTION)
the code is Logic.java for the session management:
package com.beans;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.*;
public class Logic {
protected Configuration cfg;
protected SessionFactory sfg;
protected Session s;
protected Transaction tx;
public Logic() {
this.init();
}
public void init() {
this.setCfg(new Configuration().configure());
this.setSfg(this.getCfg().buildSessionFactory());
this.setS(this.getSfg().openSession());
this.setTx(this.getS().beginTransaction());
}
public Configuration getCfg() {
return cfg;
}
public void setCfg(Configuration cfg) {
this.cfg = cfg;
}
public SessionFactory getSfg() {
return sfg;
}
public void setSfg(SessionFactory sfg) {
this.sfg = sfg;
}
public Session getS() {
return s;
}
public void setS(Session s) {
this.s = s;
}
public Transaction getTx() {
return tx;
}
public void setTx(Transaction tx) {
this.tx = tx;
}
}
the User class :
package com.beans;
// Generated 3 janv. 2013 12:07:19 by Hibernate Tools 3.4.0.CR1
/**
* User generated by hbm2java
*/
public class User implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer userId;
private Groupe groupe;
private String username;
private String password;
private String email;
public User() {
}
public User(Groupe groupe, String username, String password, String email) {
this.groupe = groupe;
this.username = username;
this.password = password;
this.email = email;
}
public Integer getUserId() {
return this.userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
public Groupe getGroupe() {
return this.groupe;
}
public void setGroupe(Groupe groupe) {
this.groupe = groupe;
}
public String getUsername() {
return this.username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return this.password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
}
the user.hbm :
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 3 janv. 2013 12:07:19 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="User" table="user" catalog="apurement">
<id name="userId" type="java.lang.Integer">
<column name="user_id" />
<generator class="identity" />
</id>
<many-to-one name="groupe" class="com.beans.Groupe" fetch="select">
<column name="groupe_id" not-null="true" />
</many-to-one>
<property name="username" type="string">
<column name="username" length="45" not-null="true" />
</property>
<property name="password" type="string">
<column name="password" length="45" not-null="true" />
</property>
<property name="email" type="string">
<column name="email" length="45" not-null="true" />
</property>
</class>
</hibernate-mapping>
groupe.java :
package com.beans;
// default package
// Generated 3 janv. 2013 12:07:19 by Hibernate Tools 3.4.0.CR1
import java.util.HashSet;
import java.util.Set;
/**
* Groupe generated by hbm2java
*/
public class Groupe implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer groupeId;
private String groupeName;
private String groupeRole;
private Set users = new HashSet(0);
public Groupe() {
}
public Groupe(String groupeName, String groupeRole) {
this.groupeName = groupeName;
this.groupeRole = groupeRole;
}
public Groupe(String groupeName, String groupeRole, Set users) {
this.groupeName = groupeName;
this.groupeRole = groupeRole;
this.users = users;
}
public Integer getGroupeId() {
return this.groupeId;
}
public void setGroupeId(Integer groupeId) {
this.groupeId = groupeId;
}
public String getGroupeName() {
return this.groupeName;
}
public void setGroupeName(String groupeName) {
this.groupeName = groupeName;
}
public String getGroupeRole() {
return this.groupeRole;
}
public void setGroupeRole(String groupeRole) {
this.groupeRole = groupeRole;
}
public Set getUsers() {
return this.users;
}
public void setUsers(Set users) {
this.users = users;
}
}
Groupe.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 3 janv. 2013 12:07:19 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
<class name="Groupe" table="groupe" catalog="apurement">
<id name="groupeId" type="java.lang.Integer">
<column name="groupe_id" />
<generator class="identity" />
</id>
<property name="groupeName" type="string">
<column name="groupe_name" length="100" not-null="true" />
</property>
<property name="groupeRole" type="string">
<column name="groupe_role" length="45" not-null="true" />
</property>
<set name="users" table="user" inverse="true" lazy="true" fetch="select">
<key>
<column name="groupe_id" not-null="true" />
</key>
<one-to-many class="com.beans.User" />
</set>
</class>
</hibernate-mapping>
hibernate.cfg:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate- configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="sf">
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/apurement</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<mapping class="com.beans.User" resource="com/beans/User.hbm.xml"/>
<mapping class="com.beans.Groupe" resource="com/beans/Groupe.hbm.xml"/>
</session-factory>
</hibernate-configuration>
i don't know what is going on.
You have a User that has a many-to-one mapping to a Groupe with not-null specified as true. You are trying to persist (insert) a User that does not have a Groupe.