org.hibernate.MappingException: Could not determine type for: java.util.List, at table: user, for columns: [org.hibernate.mapping.Column(events)]

Question

It gives me the below error.

org.hibernate.MappingException: Could not determine type for: java.util.List, at table: user, for columns: [org.hibernate.mapping.Column(events)]

Here my Code

User.java:

import com.google.common.base.Objects;

import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

@Entity
public class User {

    @Id
    @NotNull
    @Size(max = 64)
    @Column(name = "id", nullable = false, updatable = false)
    private String id;

    @NotNull
    @Size(max = 64)
    @Column(name = "name", nullable = false)
    private String name;

    @NotNull
    @Size(max = 64)
    @Column(name = "firstname", nullable = false)
    private String firstname;

    @NotNull
    @Size(max = 64)
    @Column(name = "email", nullable = false)
    private String email;

    @NotNull
    @Size(max = 64)
    @Column(name = "password", nullable = false)
    private String password;


    private List<Events> events;

    public User() {
    }

    public User(String id, String name, String firstname, String email, String password) {
        super();
        this.id = id;
        this.name = name;
        this.firstname = firstname;
        this.email = email;
        this.password = password;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getId() {
        return id;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public List<Events> getEvents() {
        return events;
    }

    public void setEvents(List<Events> events) {
        this.events = events;
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(this).add("id", id).add("name", name).add("firstname", firstname)
                .add("email", email).add("password", password).add("events", events).toString();
    }
}

Events.java:

public class Events {

    public Events() {
    }

    private String startEvent;
    private String endEvent;

    public String getStartEvent() {
        return startEvent;
    }

    public void setStartEvent(String startEvent) {
        this.startEvent = startEvent;
    }

    public String getEndEvent() {
        return endEvent;
    }

    public void setEndEvent(String endEvent) {
        this.endEvent = endEvent;
    }

}

Events shouldn't be stored in the database

Jakub Balhar · Accepted Answer · 2016-03-10 09:44:50Z

3

From the look of the code, it seems to me that Events shouldn't be stored in the database.

If this is the case, then it should be sufficient to mark them @Transient

@Transient
private List<Events> events;

answered Mar 10, 2016 at 9:44

Jakub Balhar

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3 Comments

Jakub Balhar Over a year ago

Then the '@Transient' annotation says that the property, or method isn't persisted to the database and still can remain there. As '@Id' is on the property it should be fine to leave only on property, but it is possible that you will need to add it to the getter and setter as well.

v.ladynev Over a year ago

@JakubBalhar It is not need to add @Transient to a setter.

Jakub Balhar Over a year ago

Thanks for clarification.

v.ladynev · Accepted Answer · 2016-03-10 10:42:24Z

2

You need to add mapping for the events property, if you need to store it in the database.

@OneToMany
private List<Events> events;

or

@OneToMany
@JoinColumn
private List<Events> events;

And add the @Entity annotation to the Events class

@Entity
public class Events {

}

edited Mar 10, 2016 at 10:42

answered Mar 10, 2016 at 9:44

v.ladynev

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