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Can anybody explain what is the difference between the Spring Framework's LocalContainerEntityManagerFactoryBean and LocalEntityManagerFactoryBean?
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LocalContainerEntityManagerFactoryBean. is the most powerful JPA setup option, allowing for flexible local configuration within the application. It supports links to an existing JDBC DataSource, supports both local and global transactions. REF: spring-framework-reference.pdf "Spring 3"
The LocalContainerEntityManagerFactoryBean gives full control over EntityManagerFactory configuration and is appropriate for environments where fine-grained customization is required. The LocalContainerEntityManagerFactoryBean will create a PersistenceUnitInfo based on the persistence.
The complete example of getting EntityManager using the custom configuration in Spring Boot. Open eclipse and create maven project, Don't forget to check 'Create a simple project (skip)'click on next. Fill all details(GroupId – entitymanager, ArtifactId – entitymanager and name – entitymanager) and click on finish.
Basically JPA specification defines two types of entity managers. They are :
i) Application-Managed : Application Managed entity manager means "Entity Managers are created and managed by merely the application ( i.e. our code )" .
ii) Container Managed : Container Managed entity manager means "Entity Managers are created and managed by merely the J2EE container ( i.e. our code doesn't directly manages instead entity managers are created and managed by container , and our code gets EM's through some way like using JNDI ).
Note : Created and Managed (above) means "opening , closing and involving entity manager in transactions"
LocalContainerEntityManagerFactoryBean - container managed
LocalEntityManagerFactoryBean - application managed
A Big Note : For spring based applications, the difference is not much. Spring only plays roles ( as container if you configure LocalContainerEntityManagerFactoryBean and as application if you configure LocalEntityManagerFactoryBean)
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The documentation says it all:
LocalContainerEntityManagerFactoryBean -- From the link: FactoryBean that creates a JPA EntityManagerFactory according to JPA's standard container bootstrap contract.
LocalEntityManagerFactoryBean -- From the link: FactoryBean that creates a JPA EntityManagerFactory according to JPA's standard standalone bootstrap contract.
Essentially, the only difference is in how they create the JPA EntityManagerFactory.
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