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Spring Boot - access to JPA EntityManager in controller (@Autowired)
25 points
In this short article, we would like to show how to get access to JPA EntityManager in a controller in Spring Boot project.
Instead of @Autowired annotation, we should use @PersistenceContext annotation.
Quick solution:
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// import javax.persistence.EntityManager;2
// import javax.persistence.PersistenceContext;3
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public class SomeController {6
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private EntityManager entityManager;9
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// some code here ...11
}
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package some.project;2
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import org.springframework.beans.factory.annotation.Autowired;4
import org.springframework.http.MediaType;5
import org.springframework.stereotype.Controller;6
import org.springframework.transaction.annotation.Transactional;7
import org.springframework.web.bind.annotation.RequestMapping;8
import org.springframework.web.bind.annotation.RequestMethod;9
import org.springframework.web.bind.annotation.ResponseBody;10
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import javax.persistence.EntityManager;12
import javax.persistence.PersistenceContext;13
import javax.servlet.http.HttpServletRequest;14
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public class SomeController {17
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private EntityManager entityManager;20
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// @Autowired22
// private SomeRepository someRepository;23
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(25
value = /path/to/some/action",26
method = RequestMethod.GET,27
produces = MediaType.APPLICATION_JSON_VALUE28
)29
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public SomeResponse someAction(HttpServletRequest request) {32
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// some operations here ...34
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// SomeEntity someEntity = ...;36
// this.entityManager.refresh(someEntity);37
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return new SomeResponse();39
}40
}