如何在 Spring 引导中配置 Hibernate AnnotatedClasses

Question

I am currently moving an old Spring project to Spring boot. In the old project we were initialising datasource and session factory in xml context explicitly. But after moving to Spring Boot, all is happening implicitly through Spring boot and application.properties.

My question is that, with no explicit creation/initialisation of datasource and sessionFactory , how can I add annotatedClasses to the hibernateSessionFactory ? Can I do it through application.properties ?

Here is how the previous context looked like:

<bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="annotatedClasses">
  <list>
    <value>com.example.myEntity</value>
  </list>
</property>

We are using following versions:

Spring: 5.1.15.RELEASE, Spring-Boot: 2.1.14.RELEASE, Hibernate: 5.4.15.Final

Quick Clarification:

So the whole project is already migrated with proper annotations. The problem comes in just one occurrence where in a Dao we are creating a query. The error is that the entity referenced in that query is not mapped.

Query creation looks as follows:

getSession().createQuery("from TemplateImpl t");

The error I get is:

org.hibernate.hql.internal.ast.QuerySyntaxException: TemplateImpl is not mapped.

The Dao is annotated with Repository and Transactional and entity (TemplateImpl) is annotated with Entity.

Do I still need to explicitly add annotatedClasses to the sessionFactory? If not then why am I getting this error?

Answer 1

With the Java based annotation configuration in Spring Boot , data access is automatically managed with:

application.propertie file:

here you define, the connection string and all other feature you want while accessing your database

@Repository interface:

an interface that helps simplified the boiler plate needed to access a database by providing native CRUD functions

@Entity class:

a class that represents your tables in memory

This link should help you.