Java: Entity classes cannot serialize exceptions

When you modify an entity class to invoke an exception that cannot be serialized by an interface, be sure to check that the relationships between the entities are correct.

Could not serialize; Nested exception is org.hibernate.type.SerializationException:could not serialize

Reason

Student Field
@Column (name = "User")
private user user;

Error sending request "could not serialize; Nested exception is org.hibernate.type.SerializationException:could not serialize serialization failed

Student Field
@JoinColumn (name = "User")
private user user;

Error sending request "could not serialize; Nested exception is org.hibernate.type.SerializationException:could not serialize serialization failed

Student Field
@ManyToOne
private user user;

Add user_id field in success table Joincolumn can omit

Student Field
@ManyToOne
@Column (name = "User")
private user user;

Start an error with column

conclusion, it is necessary to use annotations if there is a multiple-to-many-to-many relationship, otherwise serialization fails Joincolumn just change the field name

Java: Entity classes cannot serialize exceptions