java - org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join -

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i have problem hql
have 3 tables
1. users (user_id = pk, username)
2. groups (group_id = pk, group_name)
3. usergroups (user_id = fk, group_id = fk) 

<hibernate-mapping> <class name="com.model.authrole.usergroups" table="user_groups" catalog="db_realm" optimistic-lock="version">     <composite-id name="id" class="com.model.authrole.usergroupsid">         <key-property name="userid" type="int">             <column name="user_id" />         </key-property>         <key-property name="groupid" type="int">             <column name="group_id" />         </key-property>     </composite-id>     <many-to-one name="groups" class="com.model.authrole.groups" update="false" insert="false" fetch="select">         <column name="group_id" not-null="true" />     </many-to-one>     <many-to-one name="users" class="com.model.authrole.users" update="false" insert="false" fetch="select">         <column name="user_id" not-null="true" />     </many-to-one>     <property name="aktiv" type="boolean">         <column name="aktiv" not-null="true" />     </property> </class>

i want show username , group_name error hql

from usergroups  ug  inner  join  users  u on u.user = ug.user_id inner  join  groups g on g.group = ug.group_id

and log error

org.hibernate.hql.internal.ast.querysyntaxexception: path expected join! [from com.model.authrole.usergroups ug inner join users u on u.user = ug.user_id inner join groups g on g.group = ug.group_id]

how fix ?

i assume class usergroups contains object user , object group classes

session.createquery("from usergroups ug ug.user = :user , ug.group =:group").setparameter("user", (users)session.get(users.class,user_id)).setparameter("group", (groups)session.get(groups.class,group_id));

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