I create a small java class for hibernate but its gives an exception.I'm using Hibernate 5.0.2 and java 8 on ubuntu 14.04.
My classes and Hibernate configuration files is as follows.Hope someone can help me to find a solution to this.
This is the exception that occurs.
java.lang.NullPointerException
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.getResources(ClassLoaderServiceImpl.java:173)
at java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:348)
at java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.loadJavaServices(ClassLoaderServiceImpl.java:324)
at org.hibernate.integrator.internal.IntegratorServiceImpl.<init>(IntegratorServiceImpl.java:40)
at org.hibernate.boot.registry.BootstrapServiceRegistryBuilder.build(BootstrapServiceRegistryBuilder.java:212)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:119)
at com.gim.gimpro.HibernateTest.setUp(HibernateTest.java:43)
at com.gim.gimpro.HibernateTest.main(HibernateTest.java:18)
Here is my code
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.gim.hibe.UserDetails;
public class HibernateTest {
private SessionFactory sessionFactory;
public static void main(String[] args){
HibernateTest hibernateTest=new HibernateTest();
try {
hibernateTest.setUp();
hibernateTest.save();
} catch (Exception e) {
e.printStackTrace();
}
}
void save(){
UserDetails userDetails=new UserDetails();
userDetails.setUserId(1);
userDetails.setUserName("Gihan");
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save( userDetails );
session.getTransaction().commit();
session.close();
}
protected void setUp() throws Exception {
sessionFactory = new Configuration().configure() .buildSessionFactory();
}
}
UserDetails class
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name = "USER_DETAILS")
public class UserDetails {
#Id
private int userId;
private String userName;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
}
Hibernate Configuration
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 5.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernatedb</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.hbm2ddl.auto">create</property>
<mapping class="com.gim.hibe.UserDetails"/>
</session-factory>
</hibernate-configuration>
This Exception can occur because of below 2 reasons:
Please check if package com.gim.hibe for UserDetails class is correct.
Also see if Hibernate libraries are properly included in the classpath.
Related
This question already has answers here:
Hibernate 5 :- org.hibernate.MappingException: Unknown entity
(6 answers)
Closed 5 years ago.
I am creating a simple application using Hibernate JPA (annotations) and MySQL.I keep getting a:
WARN: HHH000183: no persistent classes found for query class: from
tn.ensi.cloudtrustproject.dao.entity.Country
when testing the Hibernate mapping.
I could not locate the problem so far. Please any help.
This is my hibernate.cfg.xml:
<!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.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name=
"hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name=
"hibernate.connection.url">jdbc:mysql://127.0.0.1:3306/TrustCloud</property>
<property name="hibernate.connection.pool_size">1</property>
<property name=
"hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider
</property>
<property name= "hibernate.show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<property name="current_session_context_class">thread</property>
<mapping class="tn.ensi.cloudtrustproject.dao.entity.Country" ></mapping>
<mapping class="tn.ensi.cloudtrustproject.dao.entity.CloudUser"></mapping>
</session-factory>
</hibernate-configuration>
This is HibernateUtil:
public class HibernateUtil {
private static SessionFactory sessionFactory= buildSessionFactory();
private static ServiceRegistry serviceRegistry;
private static Session session=null;
private static SessionFactory buildSessionFactory(){
try{
Configuration configuration= new Configuration();
configuration.configure("config/hibernate.cfg.xml");
serviceRegistry=new
StandardServiceRegistryBuilder().
applySettings(configuration.getProperties()).build();
return configuration.buildSessionFactory (serviceRegistry);
}
catch (Throwable ex){
System.err.println("Failed to cerate SessionFactory object"+ ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory(){
return sessionFactory;
}
public static Session openSession(){
return sessionFactory.openSession();
}
public static Session getCurrentSession(){
return sessionFactory.getCurrentSession();
}
public static void close(){
sessionFactory.close();
}
}
The class Test.java:
package tn.ensi.cloudtrustproject.util;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
public class Test {
static Session session= HibernateUtil.openSession();
public static void main(String[] args) {
session.createQuery("from tn.ensi.cloudtrustproject.dao.entity.Country
").list();
}
}
The entity class:
package tn.ensi.cloudtrustproject.dao.entity;
import java.io.Serializable;
import javax.persistence.*;
#Entity
#Table(name="country")
public class Country implements Serializable{
private static final long serialVersionUID = 1L;
#Id #GeneratedValue
#Column(name="countryid")
private Integer countryId ;
#Column(name="countrydes")
private String countryDes;
public Country(Integer countryId, String countryDes) {
super();
this.countryId = countryId;
this.countryDes = countryDes;
}
public Country() {
super();
// TODO Auto-generated constructor stub
}
public Integer getCountryId() {
return countryId;
}
public void setCountryId(Integer countryId) {
this.countryId = countryId;
}
public String getCountryDes() {
return countryDes;
}
public void setCountryDes(String countryDes) {
this.countryDes = countryDes;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
#Override
public String toString() {
return "Country [countryId=" + countryId + ", countryDes=" + countryDes
+ "]";
}
}
The project:
project
The table is created:
Table country
you have mentioned configuration file exists in config/hibernate.cfg.xml. Please check whether it is existing in same location.
I'm trying to create a small project with hibernate, but i got that error "Type is not mapped [select o from Type o]", I added mapping in hibernate.cfg.xml but still error.
Type.java:
package com.formation.gestionprojet.doa.entity;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="Type")
public class Type implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
#Id
private Long id;
private String name;
private String description;
private String active;
public Type() {
super();
// TODO Auto-generated constructor stub
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getActive() {
return active;
}
public void setActive(String active) {
this.active = active;
}
}
hibernate.org.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>
<!-- database connection setting -->
<property name ="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/gestion_projet?createDatabaseIfNotExist=true</property>
<property name="connection.username">root</property>
<property name= "connection.password">root</property>
<!-- Dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Disable the second level cache -->
<property name="cache.provider_class" >org.hibernate.cache.NoCacheProvider</property>
<!-- echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drope and re-create the database -->
<property name="hbm2ddl.auto">update</property>
<!-- mapping -->
<mapping class= "com.formation.gestionprojet.doa.entity.Type"/>
</session-factory>
</hibernate-configuration>
hibernateUtil.java:
package com.formation.gestionprojet.utils;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
#SuppressWarnings("deprecation")
public class HibernateUtil
{
private static SessionFactory sessionFactory;
private static ServiceRegistry serviceRegistry;
static
{
try
{
Configuration configuration = new Configuration();
configuration.configure("config/hibernate.cfg.xml");
serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
}
catch (HibernateException ex)
{
System.err.println("Error creating Session: " + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory()
{
return sessionFactory;
}
public static Session openSession()
{
return sessionFactory.openSession();
}
public static Session getCurrentSession()
{
return sessionFactory.getCurrentSession();
}
public static void close(){
if(sessionFactory!=null){
sessionFactory.close();
}
}
}
Test.Java
package com.formation.gestionprojet.utils;
import org.hibernate.Session;
public class Test {
static Session session = HibernateUtil.openSession();
public static void main(String[] args) {
session.createQuery("select o from Type o").list();
}
}
solved ! the problem was the version of hibernate that I used so I change it, a change in HibernateUtil.
This question is different from the other questions on the same topic of MappingException: Unknown entity because I have this line in my hibernate config:
<mapping class="bbb.Students" />
My entity class is as follows:
package bbb;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name = "Students")
public class Students implements java.io.Serializable {
private String id;
private String name;
private String number;
#Id
#Column(name = "ID", unique = true, nullable = false)
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
#Column(name = "NAME", nullable = false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#Column(name = "NUMBER", nullable = false)
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
}
I have the database test and the table Students manually created.
The error is:
org.hibernate.MappingException: Unknown entity: bbb.Students
Exception in thread "main" org.hibernate.MappingException: Unknown entity: bbb.Students
at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1533)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104)
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:682)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:674)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:669)
at bbb.App.main(App.java:39)
The Main class is as follows:
package bbb;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class App
{
public static void main( String[] args )
{
System.out.println("Hibernate one to one (Annotation)");
Configuration conf = new Configuration();
SessionFactory sf = conf.configure()
.buildSessionFactory(
new StandardServiceRegistryBuilder()
.applySettings(conf.getProperties())
.build());
Session session = sf.openSession();
session.beginTransaction();
Students s = new Students();
s.setId("1");
s.setName("Joe");
s.setNumber("12345");
session.save(s);
session.getTransaction().commit();
System.out.println("Done");
}
}
The full hibernate.config is as follows:
<?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.url">jdbc:mysql://localhost:3306/test</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<mapping class="bbb.Students" />
</session-factory>
</hibernate-configuration>
Just imported your Students class in a Hibernate based project. Everything work fine. Before running the application, I created schema "test" manually. Post a class with the main method. Probably something is wrong in it.
Update:
Imported your's main method. The application still works. Can't reproduce an issue.
import bbb.Students;
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
public class Main {
private static final SessionFactory ourSessionFactory;
static {
try {
ourSessionFactory = new Configuration().
configure("hibernate.cfg.xml").
buildSessionFactory();
} catch (Throwable ex) {
throw new ExceptionInInitializerError(ex);
}
}
public static Session getSession() throws HibernateException {
return ourSessionFactory.openSession();
}
public static void main(final String[] args) throws Exception {
final Session session = getSession();
try {
Transaction transaction= session.beginTransaction();
Students student = new Students();
student.setName("Vasua");
student.setNumber("13");
student.setId("1");
session.save(student);
transaction.commit();
} finally {
session.close();
}
}
}
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernte Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.url">
jdbc:mysql://localhost/stack
</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="connection.username">
root
</property>
<property name="connection.password">
root
</property>
<!-- DB schema will be updated if needed -->
<property name="hbm2ddl.auto">update</property>
<mapping class="bbb.Students"/>
</session-factory>
</hibernate-configuration>
I was trying to write my first Hibernate project, while running it I got this exception:
java.lang.ClassCastException: com.SampleProjectDto.UserDetails cannot be cast to com.splwg.base.api.GenericPersistentEntity
Table got created in the DB but values are not inserted in it.
Model class:
package com.SampleProjectDto;
import javax.persistence.Entity;
import javax.persistence.Id;
#Entity
public class UserDetails {
#Id
private int userId;
private String UserName;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return UserName;
}
public void setUserName(String userName) {
UserName = userName;
}
}
hibernate.cfg.xml:
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:#(db_details)</property>
<property name="connection.username">user</property>
<property name="connection.password">password</property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<mapping class ="com.SampleProjectDto.UserDetails"/>
</session-factory>
</hibernate-configuration>
Main Class:
package com.hibernate.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistryBuilder;
import com.SampleProjectDto.UserDetails;
public class HibernateTest {
public static void main(String[] args) {
UserDetails user = new UserDetails();
user.setUserId(1);
user.setUserName("Somya");
Configuration cfg = new Configuration();
cfg.configure("hibernate.cfg.xml");
ServiceRegistryBuilder srb = new ServiceRegistryBuilder().applySettings(cfg.getProperties());
SessionFactory sessionFactory = cfg.configure().buildSessionFactory(srb.buildServiceRegistry());
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save(user);
session.getTransaction().commit();
}
}
Error Log:
log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.lang.ClassCastException: com.SampleProjectDto.UserDetails cannot be cast to com.splwg.base.api.GenericPersistentEntity
at org.hibernate.event.internal.COBOLCompatibleFlushEntityEventListener.onFlushEntity(COBOLCompatibleFlushEntityEventListener.java:136)
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:225)
at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1127)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:325)
at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
at com.hibernate.test.HibernateTest.main(HibernateTest.java:25)
Would appreciate any help on this!
I extended GenericPersistentEntity class, now its working fine.
I am new to Hibernate, I am trying to connect it to SQL Server 2012.
I am trying to apply the hello world example in this topic
http://www.java2blog.com/2013/01/hibernate-hello-world-example-in-eclipse.html
It wasn't working at the beginning, but after search in Stack Overflow, I successfully get it connected to SQL Server 2012.
But I am still having an issue in mapping between my created class "User" with the database.
Here is my Configuration file
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name = "hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>
<property name = "hibernate.connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
<property name = "hibernate.connection.url">jdbc:sqlserver://KAREEM-LAPTOP;databaseName=Hibernate;instanceName=SQLEXPRESS;</property>
<property name = "hibernate.connection.username">sa</property>
<property name = "hibernate.connection.password">DFKI123</property>
<property name = "hibernate.show_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<mapping class="org.arpit.javapostsforlearning.User" table="User"></mapping>
</session-factory>
</hibernate-configuration>
The User Class
package org.arpit.javapostsforlearning;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity(name="User")
#Table(name = "User")
public class User {
#Id
int userId;
#Column(name="User_Name")
String userName;
#Column(name="userMessage")
String userMessage;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserMessage() {
return userMessage;
}
public void setUserMessage(String userMessage) {
this.userMessage = userMessage;
}
}
Hibernate Main Class
package org.arpit.javapostsforlearning;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.annotations.*;
import org.hibernate.service.ServiceRegistry;
//import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
public class HibernateMain {
public static void main(String[] args) {
Configuration configuration=new Configuration();
configuration.configure("hibernate.cfg.xml");
ServiceRegistry sr= new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
SessionFactory sf=configuration.buildSessionFactory(sr);
User user1=new User();
user1.setUserId(1);
user1.setUserName("Arpit");
user1.setUserMessage("Hello world from arpit");
User user2=new User();
user2.setUserId(2);
user2.setUserName("Ankita");
user2.setUserMessage("Hello world from ankita");
Session ss=sf.openSession();
ss.beginTransaction();
//saving objects to session
ss.save(user1);
ss.save(user2);
ss.getTransaction().commit();
ss.close();
}
}
It is working fine and I got an info that Schema export complete
But after that I got an error:
Exception in thread "main" org.hibernate.MappingException: Unknown entity: org.arpit.javapostsforlearning.User
I have tried to follow several topic talking about the same issue, but no one worked with me, all topics were related to annotations but I did all of their recommendations without any hope.
I tried also to add Mapping section into the configuration file as per this article
Hibernate unknown entity error when saving new object
but it didn't work too,
What might cause this issue?
Try to change from create to update on this line:
<property name="hbm2ddl.auto">create</property>
#Entity shouldn't have any parameter as shown below:
#Entity
#Table(name = "User")
public class User {
Also, make sure that the table name in the database is exactly the same as you declared inside annotations. I hope you can solve it this way.