java - Hibernate - updating object with many to many relationship -

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i have class person , class role. there many many bidirectional relationship between person , role. if create new person, load existing role db , set role person, works. if load existing person db (already has roles), load role db, set role person - org.hibernate.nonuniqueobjectexception different object same identifier value associated session: role.

i don't know problem.

there hbm.xml

<class name="person" table="person">   <id column="id" name="id" type="java.lang.integer">     <generator class="native"/>   </id>   <property column="name" name="name" type="string"/>   <property column="surname" name="surname" type="string"/>  <property column="email" name="email" type="string"/>      <set  name="roles" table="role_person" inverse="false" lazy="true" fetch="select" cascade="all">     <key column="person_id"/>     <many-to-many class="role" column="role_id"/>  </set> </class>  <class name="role" table="role">   <id column="id" name="id" type="java.lang.integer">     <generator class="native"/>   </id>   <property column="name" name="name" type="string"/>    <set name="people" table="role_person" inverse="true" lazy="true" fetch="select">     <key column="person_id"/>     <many-to-many class="role" column="role_id"/>   </set>  </class>

my code:

person person1 = loadobjects.getperson( id); // person has role author person person2 = loadobjects.getperson( id); // person has role owner   role roleowner = loadobjects.getownerrole(); role roleauthor = loadobjects.getauthorrole();

// conditions don't work properly, true, if shouldn't, in example should true

if (!person1.getroles().contains(roleowner)) {         person1.getroles().add(roleowner); } if (!person2.getroles().contains(roleauthor)) {         person2.getroles().add(roleauthor); }  sessionfactory sessionfactory = hibernateutil.getsessionfactory(); session session = sessionfactory.opensession(); session.begintransaction();  session.saveorupdate(person1); session.saveorupdate(person2);  session.gettransaction().commit(); session.close();

there getownerrole method:

 public static role getownerrole() {     session s = sessionfactory.opensession();     s.begintransaction();     list = s.createquery("from role name = 'owner'").list();     role role = (role) a.get(0);     hibernate.initialize(role.getpeople());     s.close();     return (role) a.get(0);  }

in hbm mapping errors. thought definatel thats not cause of issue. 

<class name="person" table="person">   <id column="id" name="id" type="java.lang.integer">     <generator class="native"/>   </id>   <property column="name" name="name" type="string"/>   <property column="surname" name="surname" type="string"/>  <property column="email" name="email" type="string"/>      <set  name="roles" table="role_person" inverse="false" lazy="true" fetch="select" cascade="all">     <key column="person_id"/> // should id person id column name id..     <many-to-many class="role" column="role_id"/>// should id role id column name id..  </set> </class>  <class name="role" table="role">   <id column="id" name="id" type="java.lang.integer">     <generator class="native"/>   </id>   <property column="name" name="name" type="string"/>    <set name="people" table="role_person" inverse="true" lazy="true" fetch="select">     <key column="person_id"/>// should id role id column name id..     <many-to-many class="role" column="role_id"/>// should id well, people  id column name id..   </set>  </class>

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