Caused by: java.lang.illegalargumentexception: not a managed type:

Query: caused by: java.lang.illegalargumentexception: not a managed type: <entity_class>

Explanation:

This error occurs in Java when using JPA (Java Persistence API) or Hibernate, where the specified entity class is not recognized as a managed type.

A managed type in JPA refers to an entity class that is recognized by the persistence provider.

Example:

If we have an entity class called “Person” with the following code:

import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Person {
    @Id
    private Long id;
    // Other fields and methods
}

And if we encounter the error message “caused by: java.lang.illegalargumentexception: not a managed type: Person”, it means that the persistence provider (e.g., Hibernate) does not recognize the “Person” class as a managed entity.

To resolve this issue, make sure that:

• The entity class is annotated with {@code @Entity}.
• The entity class is scanned by the persistence provider (usually configured through XML or annotations).
• The entity class is in the correct package (e.g., if using XML-based configuration, the package containing the entity class is listed in the XML file).