We Keep Coding

Is there a class of HibernateException?

So I am doing just a simple code in hibernate and its saying "No exception of type HibernateException can be thrown". What to do?
My Code:
XML 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="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/testdb</property>
<property name="connection.username">root</property>
<property name="connection.password">Stormbreaker0811</property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQL57Dialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">create</property>
<property name="current_session_context_class">thread</property>
<mapping class="com.hibernate.Student"/>
</session-factory>
</hibernate-configuration>
POJO Class:
package com.hibernate;
import org.hibernate.annotations.Columns;
import org.hibernate.annotations.Entity;
import org.hibernate.annotations.Table;
#Entity
#Table(name = "student")
public class Student {
#Id
#Column(name="ID")
private int id;
#Column(name="NAME")
private String name;
#Column(name="EMAIL")
private String email;
#Column(name="GENDER")
private String gender;
#Column(name="AGE")
private int age;
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 String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
And the Main Class:
package com.hibernate;
import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Student_Main {
private static SessionFactory factory;
public static void main(String[] args) throws Exception {
try {
factory = new org.hibernate.cfg.Configuration().configure("hibernate.cfg.xml").addAnnotatedClass(Student.class).buildSessionFactory();
} catch (Exception | HibernateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Any Solution on this?
I tied to handle with just Exception class but still it tells me to add throws declaration or catch method. I was expecting for the problemto be gone but still not gone.

Not able to save object using hibernate

INFO: HHH10001008: Cleaning up connection pool [jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false&serverTimezone=UTC]
Exception in thread "main" org.hibernate.PropertyAccessException:
Could not set field value [POST_INSERT_INDICATOR] value by reflection
: [class com.luvjava.hibernate.demo.entity.Student.id] setter of
com.luvjava.hibernate.demo.entity.Student.id at
org.hibernate.property.access.spi.SetterFieldImpl.set(SetterFieldImpl.java:72)
at
com.luvjava.hibernate.demo.CreateStudentDemo.main(CreateStudentDemo.java:33)
Caused by: java.lang.IllegalArgumentException: Can not set int field
com.luvjava.hibernate.demo.entity.Student.id to
org.hibernate.id.IdentifierGeneratorHelper$2
error comes when saving student object in CreateStudentDemo.class
CreateStudentDemo.class
package com.luvjava.hibernate.demo;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.luvjava.hibernate.demo.entity.Student;
public class CreateStudentDemo {
public static void main(String[] args) {
// TODO Auto-generated method stub
//create session factory
SessionFactory factory=new Configuration()
.configure("hibernate.cfg.xml")
.addAnnotatedClass(Student.class)
.buildSessionFactory();
//create session object
Session session=factory.getCurrentSession();
System.out.println("before try block");
//save object
try {
//begin transaction
session.beginTransaction();
System.out.println("Creating student object..");
//create object
Student theStudent=new Student("Ravisher","Singh","rvsingh3213#gmail.com");
//save object
System.out.println("Saving Student Object...");
session.save(theStudent); **This is line from where exception starts**
System.out.println(" afterSaving Student Object...");
//commit changes
session.getTransaction().commit();
System.out.println("commit Done");
}
finally {
session.flush();
session.close();
factory.close();
}
}
}
This is Entity class
package com.luvjava.hibernate.demo.entity;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
#Entity
#Table(name="student")
public class Student {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="id")
private int id;
#Id
#Column(name="first_Name" )
private String firstName;
#Id
#Column(name="last_Name")
private String lastName;
#Id
#Column(name="email")
private String email;
public Student() {
System.out.println("In default constructor");
}
//Constructor using fields
public Student(String firstName, String lastName, String email) {
System.out.println("arg constructor.");
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
#Override
public String toString() {
return "Student [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
}
}
This will be 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>
<!-- JDBC Database connection settings -->
<property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false&serverTimezone=UTC</property>
<property name="connection.username">hbstudent</property>
<property name="connection.password">hbstudent</property>
<!-- JDBC connection pool settings ... using built-in test pool -->
<property name="connection.pool_size">1</property>
<!-- Select our SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Echo the SQL to stdout -->
<property name="show_sql">true</property>
<!-- Set the current session context -->
<property name="current_session_context_class">thread</property>
</session-factory>
</hibernate-configuration>

You need only one #Id annotation in your entity class
Here is how your entity should look
#Entity
#Table(name="student")
public class Student {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name="id")
private int id;
#Column(name="first_Name" ) <--- first_Name, this value MUST MATCH WITH WHAT YOU HAVE IN YOUR DATABASE
private String firstName;
#Column(name="last_Name")<--- last_Name, this value MUST MATCH WITH WHAT YOU HAVE IN YOUR DATABASE
private String lastName;
#Column(name="email")
private String email;
public Student() {
System.out.println("In default constructor");
}
//Constructor using fields
public Student(String firstName, String lastName, String email) {
System.out.println("arg constructor.");
this.firstName = firstName;
this.lastName = lastName;
this.email = email;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
#Override
public String toString() {
return "Student [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
}
}

Hibernate: object.org.hibernate.MappingException

Here is the exception i am facing, it occurs when i call session.save
object.org.hibernate.MappingException: Unknown entity:
com.java.learn.pojo.Employee
here is my java code
try
{
Configuration configuration = new Configuration().configure();
StandardServiceRegistryBuilder builder =
new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
SessionFactory factory = configuration.buildSessionFactory(builder.build());
Session session = factory.openSession();
Employee e = new Employee(1, "", "", 3);
e.setFirstName("sparsh");
session.save(e);
System.out.println("in dao");
}
catch (Throwable ex)
{
System.err.println("Failed to create sessionFactory object." + ex);
factory.close();
throw new ExceptionInInitializerError(ex);
}
and here is my hibrnate.cfg.xml
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.connection.driver_class">
com.mysql.jdbc.Driver
</property>
<!-- Assume students is the database name -->
<property name="hibernate.connection.url">
jdbc:mysql://localhost/test
</property>
<property name="hibernate.connection.username">
root
</property>
<property name="hibernate.connection.password">
root1
</property>
<property name="hbm2ddl.auto">create</property>
<property name="show_sql">true</property>
<mapping class="com.java.learn.pojo.Employee"/>
</session-factory>
</hibernate-configuration>
this exception occurs because of no mapping for Pojo class, but I have added it.
Pojo class
package com.java.learn.pojo;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
#Table
#Entity
public class Employee
{
#Id
#GeneratedValue
#Column(name = "id")
private int id;
#Column(name = "first_name")
private String firstName;
#Column(name = "last_name")
private String lastName;
#Column(name = "salary")
private int salary;
public Employee()
{
}
public Employee(int id, String firstName, String lastName, int salary)
{
super();
this.id = id;
this.firstName = firstName;
this.lastName = lastName;
this.salary = salary;
}
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getFirstName()
{
return firstName;
}
public void setFirstName(String first_name)
{
this.firstName = first_name;
}
public String getLastName()
{
return lastName;
}
public void setLastName(String last_name)
{
this.lastName = last_name;
}
public int getSalary()
{
return salary;
}
public void setSalary(int salary)
{
this.salary = salary;
}
}
Please help

You can use new Configuration().configure() to load the Entity mappings from hbm.xml files.
But because you are using annotations for your Employee Entity class, you simply need to use AnnotationConfiguration instead of Configuration as shown below:
So, replace the line below:
Configuration configuration = new Configuration().configure();
with:
Configuration configuration = new AnnotationConfiguration().configure();

Problem:
The problem is obvious here, you have not correctly mapped your Employee entity which is so relevant from the error stack trace:
object.org.hibernate.MappingException: Unknown entity: com.java.learn.pojo.Employee
And the problem is that the mapped entity in your hibernate.cfg.xml configuration file can't be reached because you placed your file under web-inf/classes so when hibernate tries to look for your Entity it will look for it under web-inf/classes and it won't find it.
Solution:
To solve this problem you just need to place your hibernate.cfg.xml file under Java/src folder instead of web-inf/classes so the Entity can be reached.

MySQL table not mapped by Hibernate 5+

I'm trying to learn Hibernate using MySQL built-in database named world. It has three tables called city, country and countrylanguage. What I'm trying to do is execute SQL statement SELECT * FROM world.city;. When I run my project I'm getting error
org.hibernate.hql.internal.ast.QuerySyntaxException: City is not mapped [from City]
I'm using IntelliJ IDEA and Hibernate 5.2.8.
I created mapping xml file like this:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="pl.hibernatePackage">
<class name="City" table="city">
<id name="id" column="ID" type="int">
<generator class="native"/>
</id>
<property name="name" column="Name" type="string"/>
<property name="countryCode" column="CountryCode" type="string"/>
<property name="district" column="District" type="string"/>
<property name="population" column="Population" type="int"/>
</class>
</hibernate-mapping>
City.java is presented below:
public class City
{
private Integer id;
private String name;
private String countryCode;
private String district;
private Integer population;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCountryCode() {
return countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
public String getDistrict() {
return district;
}
public void setDistrict(String district) {
this.district = district;
}
public Integer getPopulation() {
return population;
}
public void setPopulation(Integer population) {
this.population = population;
}
}
I'm creating session in HibernateUtil.java
public class HibernateUtil
{
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
StandardServiceRegistryBuilder standardServiceRegistryBuilder = new StandardServiceRegistryBuilder();
standardServiceRegistryBuilder.applySettings(configuration.getProperties());
ServiceRegistry serviceRegistry = standardServiceRegistryBuilder.build();
return configuration.buildSessionFactory(serviceRegistry);
}
catch(Exception e) {
throw new ExceptionInInitializerError(e);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
Configuration file
<?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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/world</property>
<property name="hibernate.connection.username">test</property>
<property name="hibernate.connection.password">1234</property>
<property name="connection.pool_size">1</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="show_sql">false</property>
<property name="hbm2ddl.auto">update</property>
<!-- List of XML mapping files -->
<mapping resource="pl/hibernatePackage/City.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Main
public class Main
{
public static void main(String[] args)
{
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
List<City> cities = session.createQuery("from City").list();
for(City c : cities) {
System.out.println(c.getId() + "\t" + c.getName() + "\t" + c.getCountryCode() + "\t" + c.getDistrict() +
"\t" + c.getPopulation());
}
session.getTransaction().commit();
HibernateUtil.getSessionFactory().close();
}
}
EDIT Full error list
EDIT 2
javac result

I have done some testing and i made it work by using the fully qualified class name:
session.createQuery("from pl.hibernatePackage.City")
Now this is only a workaround without touching your config..
After digging deeper i found out that since hibernate version 5.x, there is a different strategy for building the sessionFactory.
I made your example work by implementing sessionFactory as follows:
StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
.configure()
.build();
Metadata metadata = new MetadataSources( standardRegistry )
.getMetadataBuilder()
.build();
return configuration.buildSessionFactory(serviceRegistry);
This is explained with example here: jboss documentation (point 2.4)

Thanks to Maciej's answer and help of other guys I managed to get my example to work by modifying code and cleaning it up a little. I also found out that mapping DB with xml file is outdated so I modifiied properly CityEntity class. Final code:
Main.java
import org.hibernate.Session;
import java.util.List;
public class Main
{
public static void main(String[] args)
{
Session session = HibernateUtil.getSession();
session.beginTransaction();
List<CityEntity> cities = session.createQuery("from CityEntity").list();
for(CityEntity c : cities)
{
System.out.println(c.getId() + "\t" + c.getName() + "\t" + c.getCountryCode() + "\t" + c.getDistrict() +
"\t" + c.getPopulation());
}
session.getTransaction().commit();
HibernateUtil.close();
}
}
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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/world</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">1234</property>
<property name="connection.pool_size">1</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">update</property>
<!-- List of mapped classes -->
<mapping class="CityEntity"/>
</session-factory>
</hibernate-configuration>
HibernateUtil.java
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtil
{
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
.configure()
.build();
return configuration.buildSessionFactory(standardRegistry);
}
catch(Exception e) {
throw new ExceptionInInitializerError(e);
}
}
public static Session getSession()
{
return sessionFactory.openSession();
}
public static void close()
{
sessionFactory.close();
}
}
CityEntity.java
import javax.persistence.*;
#Entity
#Table(name = "city", schema = "world")
public class CityEntity
{
private int id;
private String name;
private String countryCode;
private String district;
private int population;
#Basic
#Column(name = "CountryCode")
public String getCountryCode() {
return countryCode;
}
public void setCountryCode(String countryCode) {
this.countryCode = countryCode;
}
#Id
#Column(name = "ID")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
#Basic
#Column(name = "Name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#Basic
#Column(name = "District")
public String getDistrict() {
return district;
}
public void setDistrict(String district) {
this.district = district;
}
#Basic
#Column(name = "Population")
public int getPopulation() {
return population;
}
public void setPopulation(int population) {
this.population = population;
}
}

inner join between two tables Hibernate

I need to do Inner join between two tables, but without success, I have to find all the patients related to a particular User,I tried to query without success.
I am using mysql and hibernate 3.6.4.
This is my code
Patient.java
#Entity
public class Patient {
#Id
private int id;
private String paitentFirstName;
private String paitentLastName;
private Date dateOfbirth;
private String sex;
#ManyToMany(cascade = {CascadeType.ALL})
#JoinTable(name="User_Patient",
joinColumns={#JoinColumn(name="id")},
inverseJoinColumns={#JoinColumn(name="userName")})
private Set<User> users = new HashSet<User>();
public Set<User> getUsers() {
return users;
}
public void setMeetings(Set<User> users) {
this.users = users;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getPaitentFirstName() {
return paitentFirstName;
}
public void setPaitentFirstName(String paitentFirstName) {
this.paitentFirstName = paitentFirstName;
}
public String getPaitentLastName() {
return paitentLastName;
}
public void setPaitentLastName(String paitentLastName) {
this.paitentLastName = paitentLastName;
}
public Date getDateOfbirth() {
return dateOfbirth;
}
public void setDateOfbirth(Date dateOfbirth) {
this.dateOfbirth = dateOfbirth;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
#Override
public String toString() {
return "Patient [id=" + id + ", paitentFirstName=" + paitentFirstName
+ ", paitentLastName=" + paitentLastName + ", dateOfbirth="
+ dateOfbirth + ", sex=" + sex + "]";
}
}
User.java
#Entity
public class User {
#Id
private String UserName;
#ManyToMany(mappedBy="users")
private Set<Patient> patients = new HashSet<Patient>();
public String getUserName() {
return UserName;
}
public void setUserName(String userName) {
UserName = userName;
}
public Set<Patient> getEmployees() {
return patients;
}
public void setEmployees(Set<Patient> patients) {
this.patients = patients;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
private String password;
}
Hibernate configuration 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>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test2</property>
<property name="connection.username">root</property>
<property name="connection.password">1234</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL 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>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">update</property>
<!-- Names the annotated entity class -->
<mapping class="com.objects.Patient"/>
<mapping class="com.objects.User"/>
</session-factory>
</hibernate-configuration>

There is no need for explicit join.
With Hibernate version that do have HHH-5209 fixed, query can be written as follows:
SELECT p
FROM Patient p
WHERE :particularUser MEMBER OF p.users
With older versions IN ELEMENTS can be used instead:
SELECT p
FROM Patient p
WHERE :particularUser IN ELEMENTS (p.users)