If you are using Spring Boot + Data JPA and Caching, like Redis Cache, you will get the above exception if you do not serialize your Entity or POJO classes.
Fix/Solution:
Your Entiry class needs to have implements Serializable with a serialVersionUID field.
Example: Change this:
@Entity
public class DbUser {
public DbUser(int userId, String userName) {
this.userId = userId;
this.userName = userName;
}
To this,
import java.io.Serializable;
@Entity
public class DbUser implements Serializable {
private static final long serialVersionUID = 1L;
public DbUser(int userId, String userName) {
this.userId = userId;
this.userName = userName;
}
![Fix the Serializable Error Spring Boot and Caching Fix the Serializable Error Spring Boot and Caching](https://code2care.org/java/fix-spring-boot-redis-caching-illegal-argument-exception-default-serializer-requires-a-serializable-payload/images/Fix the Serializable Error Spring Boot and Caching.jpg)
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