How to Resolve Hibernate\'s \'hibernate.dialect\' Not Set Error in Spring Boot?

Hibernate Dialect Configuration Error: 'hibernate.dialect' Not Set

Issue:
When running a Spring Boot application using Hibernate, an error is encountered stating:

"org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set"

Cause:
The Hibernate configuration is missing the hibernate.dialect property, which specifies the database dialect to use. Without this property, Hibernate cannot determine the correct dialect and establish the database connection.

Solution:

1. Spring Boot Application:

For Spring Boot applications, it is recommended to use application properties or YAML files to configure Hibernate. Remove the custom Hibernate configuration class (e.g., HibernateConfig) and add the following properties to your application.properties or application.yml file:

# Database Configuration
spring.datasource.url=jdbc:postgresql://localhost:5432/teste?charSet=LATIN1
spring.datasource.username=klebermo
spring.datasource.password=123

# Hibernate Configuration
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.show-sql=false
spring.jpa.hibernate.ddl-auto=create

Spring Boot will automatically configure a SessionFactory using these properties.

2. Java Configuration:

If you prefer to use Java configuration, remove the hibernateProperties() method from your HibernateConfig class and add the following code instead:

@Bean
public HibernateJpaSessionFactoryBean sessionFactory(EntityManagerFactory emf) {
    HibernateJpaSessionFactoryBean factory = new HibernateJpaSessionFactoryBean();
    factory.setEntityManagerFactory(emf);
    return factory;
}

This will create a SessionFactory that wraps the EntityManagerFactory. You can access the SessionFactory later using entityManagerFactory.unwrap(SessionFactory.class).

Additional Notes:

• Remove the commons-dbcp dependency from your pom.xml file. Spring Boot will configure the more efficient HikariCP connection pool automatically.
• Consider using the @SpringBootApplication annotation to automatically enable Spring Boot features, including transaction management and configuration for Hibernate.

By following these steps, you can resolve the dialect configuration error and successfully establish a database connection using Hibernate in your Spring Boot application.

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