Delete query also getting called along with select query on user entity

[srikanth Thandra]

Hi All,

I am observing that delete query on user_skills table is also getting called along with user select query.
Actually there are two entities User and Skill. There is a ManyToMany relationship between these two entities with a join table USER_SKILLS. Below are the class defintions:

@Entity
@Table(name = "User")
public class User implements Serializable
{
	private static final long serialVersionUID = -4897108409883787719L;

	@Id
	@GeneratedValue(generator = "system-uuid")
	@GenericGenerator(name = "system-uuid", strategy = "uuid")
	@Column(name = "id")
	private String				id					= null;
	
	@Column(name = "firstName")
	private String				firstName			= null;
	
	@Column(name = "lastName")
	private String				lastName			= null;

        @ManyToMany(fetch=FetchType.LAZY)
	@JoinTable(name="user_skills",joinColumns={@JoinColumn(name="id")},
	inverseJoinColumns={@JoinColumn(name="skill_id")})
	private Set<Skill> userSkills;
}	

@Entity
@Table(name = "Skill")
public class Skill implements Comparable<Skill>,Serializable{

	private static final long serialVersionUID = 1390792949023983053L;

	@Id
	@GeneratedValue(generator = "system-uuid")
	@GenericGenerator(name = "system-uuid", strategy = "uuid")
	@Column(name = "skill_id")
	private String		id				= null;
	
	@Column(name = "name")
	private String		name			= null;
	

I was able to save User with  many skills into database and when I try to get the saved user info from database then delete query on user_skills table is also getting fired and the data is getting deleted from user_skills table. Below is the queries log:

Hibernate:
   User table query: select this_.id as id1_2_0_,this_.first_name as first_na8_2_0_,this_.last_name as last_na11_2_0_ from user user0_  where user0_.id=?
   
   User_Skills table query: select userskills0_.id as id1_2_0_,userskills0_.skill_id as skill_id2_4_0_,skill1_.skill_id as skill_id1_0_1_,skill1_.name as name2_0_1_  from  user_skills userskills0_ inner join skill skill1_ on userskills0_.skill_id=skill1_.skill_id
                                          where userskills0_.id=?

   User_Skills delete query: delete from user_skills where id=?

Why this delete query is getting called I am not getting? Is this expected in hibernate? Can some one please help me on this?