Spring Boot: Exception Stack
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception
[Request processing failed: org.springframework.orm.jpa.JpaSystemException:
No default constructor for entity: : com.example.redisdemo.DbUser] with root cause
org.hibernate.InstantiationException: No default constructor for entity: : com.example.springboot.User
at org.hibernate.metamodel.internal.EntityInstantiatorPojoStandard.instantiate(EntityInstantiatorPojoStandard.java:101)
~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
at org.hibernate.persister.entity.AbstractEntityPersister.instantiate(AbstractEntityPersister.java:5288)
~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
The above exception is what you get when you do not have a default constructor not been defined in your Entity/POJO class when working with Spring Data JPA.
Fix:
To fix this issue, you need to simply define a default constructor in your class that gave the exception.
@Entity
public class User implements Serializable {
private static final long serialVersionUID = 1L;
public DbUser(int userId, String userName) {
this.userId = userId;
this.userName = userName;
}
//Default Constructor Added
public DbUser() {
}
@Id
private int userId;
@Column
private String userName;
...
...
![Fix - You need to add the Default Constructor Fix - You need to add the Default Constructor](https://code2care.org/java/fix-hibernate-instantiation-exception-no-default-constructor-for-enity-user/images/Fix - You need to add the Default Constructor.jpg)
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Author Info:
Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
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