Issue while fetching data from java application using hibernate

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Java

I am trying to fetch roles from database using hibernate in java application. I am undergoing a many to many mapping for the same.

After fetching the data, it is getting deleted from database. I am not calling the delete method either still the deletion occurs.

The Role.java

@Entity
@Table(name = "ROLE") public class Role extends BaseModel implements java.io.Serializable {
private Long id;
private Set<User> users = new HashSet<User>(0); 


@Id
@Column(name = "ID", unique = true, nullable = false, scale = 0)
public Long getId() {
    return this.id;
}

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


@ManyToMany(fetch = FetchType.LAZY, mappedBy = "roles")
@JoinTable(name = "USERROLEMAP", joinColumns = { @JoinColumn(name = "ROLEID", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "USERID", nullable = false, updatable = false) })
public Set<User> getUsers() {
    return this.users;
}

public void setUsers(Set<User> users) {
    this.users = users;
}

User.java

@Entity @Table(name = "USER", uniqueConstraints = @UniqueConstraint(columnNames = "LOGINID")) public class User extends BaseModel implements java.io.Serializable {
private Long id;

private Set<Role> roles = new HashSet<Role>(0);


@Id
@Column(name = "ID", unique = true, nullable = false, scale = 0)
public Long getId() {
    return this.id;
}

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


@ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@JoinTable(name = "USERROLEMAP", joinColumns = { @JoinColumn(name = "USERID", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "ROLEID", nullable = false, updatable = false) })
public Set<Role> getRoles() {
    return this.roles;
}

}

We are trying to get the roles from database using the following code snippet

public List<String> rolesAsGA() {
    List<String> proxyUserRoles = new ArrayList<String>();
    Iterator<Role> itr = getRoles().iterator();
    while (itr.hasNext()) {
        proxyUserRoles.add(new SimpleGrantedAuthority(itr.next()
                .getRoleName()));
    }
    return proxyUserRoles;
}

after fetching the roles the data (corresponding role) is getting deleted simultaneously, can anyone tell me why?