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Editorial Team
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Asked: 2026-05-25T12:08:40+00:00

I am trying to get an instance of jpa EntityManager in a servlet as

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I am trying to get an instance of jpa EntityManager in a servlet as follows

ApplicationContext context = WebApplicationContextUtils.getRequiredWebApplicationContext(servletContext);
EntityManagerFactory emf = (EntityManagerFactory)context.getBean("entityManagerFactory");
EntityManager em=emf.createEntityManager();

My question is , is it an efficient way to get an EntityManager instance inside a servlet get service method. Also should we close EntityManagerFactory/EntityManager explicitly in the above approach.

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1 Answer

  1. Editorial Team

    Since you are using spring, ideally you should use another layer (DAO for example) where you can have 

    @PersistenceContext
private EntityManager entityManager;

    And spring will take care of that.

    If you really need that access in a servlet, rather than in a spring-mvc @Controller, then get the service/dao bean from the application context and use the above construct there. And if for some weird reason you should manually handle the entity manager – yes, you have to .close() it.

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