`public class Hibernateutil {

    private static final SessionFactory sessionFactory;
    static {
        try {
            sessionFactory = new Configuration()
                    .buildSessionFactory();
        } catch (Throwable ex) {
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
`

`@Repository
     public class StudentRepository1 {


    SessionFactory factory = Hibernateutil.getSessionFactory();

    Session currentSession =factory.getCurrentSession();

    //do something
}`

`# Details for our datasource
spring:
  datasource:
    url: jdbc:postgresql://localhost:5432/postgres
    username: postgres
    password: postgres
    driver-class-name: org.postgresql.Driver
# Hibernate properties
  jpa:
    properties:
      hibernate:
        dialect: org.hibernate.dialect.PostgreSQL95Dialect
      #current_session_context_class: thread
    show-sql: false
    hibernate.ddl-auto:
#application properties
  application:
    name: hibernate_demo
server:
  port: 10091`

`Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
    at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100) ~[hibernate-core-5.3.1.Final.jar:5.3.1.Final]
    at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54) ~[hibernate-core-5.3.1.Final.jar:5.3.1.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:137) ~[hibernate-core-5.3.1.Final.jar:5.3.1.Final]
    at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35) ~[hibernate-core-5.3.1.Final.jar:5.3.1.Final]
    at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:94) ~[hibernate-core-5.3.1.Final.jar:5.3.1.Final]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:263) ~[hibernate-core-5.3.1.Final.jar:5.3.1.Final]
    ... 39 common frames omitted`

`

dependencies {
    //compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '1.5.6.RELEASE'
    compile group: 'org.hibernate', name: 'hibernate-core', version: '5.3.1.Final'
    compile group: 'org.hibernate.javax.persistence', name: 'hibernate-jpa-2.1-api', version: '1.0.2.Final'
    compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '1.5.9.RELEASE'
    compile group: 'org.postgresql', name: 'postgresql', version: '42.2.2'

}