How To Create Hibernate Cfg Xml In Eclipse

Hibernate Java Configuration without XML Example in Eclipse using Maven

In this Hibernate example, we will learn how to create a simple Hibernate application using Java-based configuration without XML configuration in Eclipse IDE. We use Maven as a build tool and MySQL database to store the data.

Hibernate is an object-relational mapping framework for the Java language. It provides a framework for mapping an object-oriented domain model to a relational database. Object-relational mapping (ORM) is a programming technique for converting data between incompatible type systems in object-oriented programming languages.

Development Steps

Create a Simple Maven Project
Project Directory Structure
Add jar Dependencies to pom.xml
Creating the JPA Entity Class(Persistent class)
Create a Hibernate Java-based configuration file - HibernateUtil.java
Create StudentDao class
Create the Main class and Run an Application

1. Create a Simple Maven Project

2. Project Directory Structure

The project directory structure for your reference -

3. Add jar Dependencies to pom.xml

<project                xmlns=                  "http://maven.apache.org/POM/4.0.0"                                xmlns                :                xsi=                  "http://www.w3.org/2001/XMLSchema-instance"                                xsi                :                schemaLocation=                  "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"                >     <modelVersion>4.0.0</modelVersion>     <groupId>net.javaguides</groupId>     <artifactId>hibernate-java-config-example</artifactId>     <version>0.0.1-SNAPSHOT</version>     <dependencies>                                  <!--                  https://mvnrepository.com/artifact/mysql/mysql-connector-java                  -->                                <dependency>             <groupId>mysql</groupId>             <artifactId>mysql-connector-java</artifactId>             <version>8.0.13</version>         </dependency>                                  <!--                  https://mvnrepository.com/artifact/org.hibernate/hibernate-core                  -->                                <dependency>             <groupId>org.hibernate</groupId>             <artifactId>hibernate-core</artifactId>             <version>5.3.7.Final</version>         </dependency>     </dependencies> </project>

4. Creating the JPA Entity Class(Persistent class)

Let's create a Student persistent class that is mapped to a student database table:

                package                net.javaguides.hibernate.entity;                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;                @Column(name                =                                  "first_name"                )                private                String                firstName;                @Column(name                =                                  "last_name"                )                private                String                lastName;                @Column(name                =                                  "email"                )                private                String                email;                public                Student() {      }                public                Student(String                firstName,                String                lastName,                String                email) {                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;     } }

5. Create a Hibernate Java-based configuration file - HibernateUtil.java

Note that we are creating Hibernate Application using Java configuration without using hibernate.cfg.xml to connect the MySQL database.

                package                net.javaguides.hibernate.util;                import                java.util.Properties;                import                org.hibernate.SessionFactory;                import                org.hibernate.boot.registry.StandardServiceRegistryBuilder;                import                org.hibernate.cfg.Configuration;                import                org.hibernate.cfg.Environment;                import                org.hibernate.service.ServiceRegistry;                import                net.javaguides.hibernate.model.Student;                public                class                HibernateUtil                {                private                static                SessionFactory                sessionFactory;                public                static                SessionFactory                getSessionFactory() {                if                (sessionFactory                ==                null) {                try                {                Configuration                configuration                =                new                Configuration();                                  //                  Hibernate settings equivalent to hibernate.cfg.xml's properties                Properties                settings                =                new                Properties();                 settings.put(Environment                                  .DRIVER,                                  "com.mysql.cj.jdbc.Driver"                );                 settings.put(Environment                                  .URL,                                  "jdbc:mysql://localhost:3306/java_dmeo?useSSL=false"                );                 settings.put(Environment                                  .USER,                                  "root"                );                 settings.put(Environment                                  .PASS,                                  "root"                );                 settings.put(Environment                                  .DIALECT,                                  "org.hibernate.dialect.MySQL5Dialect"                );                  settings.put(Environment                                  .SHOW_SQL,                                  "true"                );                  settings.put(Environment                                  .CURRENT_SESSION_CONTEXT_CLASS,                                  "thread"                );                  settings.put(Environment                                  .HBM2DDL_AUTO,                                  "create-drop"                );                  configuration.setProperties(settings);                  configuration.addAnnotatedClass(Student                .class);                ServiceRegistry                serviceRegistry                =                new                StandardServiceRegistryBuilder()                     .applySettings(configuration.getProperties()).build();                  sessionFactory                =                configuration.buildSessionFactory(serviceRegistry);             }                catch                (Exception                e) {                 e.printStackTrace();             }         }                return                sessionFactory;     } }

6. Create StudentDao Class

Let's create a separate StudentDao class to separate out hibernate related stuff.

                package                net.javaguides.hibernate.dao;                import                org.hibernate.Session;                import                org.hibernate.Transaction;                import                net.javaguides.hibernate.model.Student;                import                net.javaguides.hibernate.util.HibernateUtil;                public                class                StudentDao                {                public                void                saveStudent(Student                student) {                Transaction                transaction                =                null;                                  //                  auto close session object                try                (Session                session                =                HibernateUtil                .getSessionFactory().openSession()) {                                  //                  start the transaction                transaction                =                session.beginTransaction();                                  //                  save student object                session.save(student);                                  //                  commit transction                transaction.commit();         }                catch                (Exception                e) {                if                (transaction                !=                null) {                 transaction.rollback();             }         }     } }

7. Create the Main class and Run an Application

Let's test Hibernate application to connect MySQL database.

                package                net.javaguides.hibernate;                import                net.javaguides.hibernate.dao.StudentDao;                import                net.javaguides.hibernate.model.Student;                public                class                App                {                public                static                void                main(String[]                args) {                StudentDao                studentDao                =                new                StudentDao();                Student                student                =                new                Student(                  "Ramesh"                ,                                  "Fadatare"                ,                                  "ramesh@gmail.com"                );         studentDao.saveStudent(student);                System                .out.println(student.getId());     } }

Output

References

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