Make Hibernate ignore instance variables that are not mapped [duplicate]

This question already has answers here: What is the easiest way to ignore a JPA field during persistence? (10 answers) Closed 6 years ago.

I thought hibernate takes into consideration only instance variables that are annotated with @Column. But strangely today when I added a variable (that is not mapped to any column, just a variable i need in the class), it is trying to include that variable in the select statement as a column name and throws the error -

Unknown column 'team1_.agencyName' in 'field list'

My class -

@Entity
@Table(name="team")
public class Team extends BaseObject implements Serializable {

@Id  @GeneratedValue(strategy=GenerationType.AUTO)
private Long id;

@Column(length=50)
private String name;

@Column(length=10)
private String code;

@Column(name = "agency_id")
private Long agencyId;

private String agencyName; //note: not annotated.

}

FYI...I use the abo开发者_Python百科ve class in another class with many to many mapping

@ManyToMany(fetch = FetchType.EAGER) 
@JoinTable(
        name="user_team",
        joinColumns = { @JoinColumn( name="user_id") },
        inverseJoinColumns = @JoinColumn( name="team_id")
)    
public Set<Team> getTeams() {
    return teams;
}

Why is this happening?!

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JPA will use all properties of the class, unless you specifically mark them with @Transient:

@Transient
private String agencyName;

The @Column annotation is purely optional, and is there to let you override the auto-generated column name. Furthermore, the length attribute of @Column is only used when auto-generating table definitions, it has no effect on the runtime.

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For folks who find this posting through the search engines, another possible cause of this problem is from importing the wrong package version of @Transient. Make sure that you import javax.persistence.transient and not some other package.

---

Placing @Transient on getter with private field worked for me.

    private String name;

    @Transient
    public String getName() {
        return name;
    }

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