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    <p>Following works for me as an answer for question number 2:</p> <pre><code>@ForeignKey( name = "none" ) </code></pre> <p>No foreign key is being generated for the relationship.</p> <pre><code>@Cascade( value = { CascadeType.ALL } ) @OneToOne( fetch = FetchType.EAGER, orphanRemoval = true ) @JoinTable( name = "Role_Group", inverseJoinColumns = { @JoinColumn( referencedColumnName = "rolleId", name = "RolleID" ) }, joinColumns = { @JoinColumn( referencedColumnName = "groupId", name = "GroupID" ) } ) @ForeignKey( name = "none" ) public AdminRole getAdmin() </code></pre> <p>Sources:</p> <ul> <li><a href="http://blog.cherouvim.com/disabling-foreign-key-generation-in-hbm2ddl/" rel="nofollow">Disabling foreign key generation in hbm2ddl</a> </li> <li><a href="https://forum.hibernate.org/viewtopic.php?f=6&amp;t=978321" rel="nofollow">Forcing hbm2ddl to not generate an FK</a></li> </ul> <p>Based on the sources, it is an undocumented feature which was seen in release notes:</p> <pre><code>Changes in version 2.1.9 (xx.x.xxxx) ------------------------------------ * TimesTenDialect now supported (look at TimesTenDialect for certain limitations) * foreign-key="none" can be used to disable generation of a foreign key. </code></pre> <p>In xml config - you would use it like this</p> <pre><code>&lt;many-to-one name="Hospital" column="hospitalId" property-ref="hospitalId" update="false" insert="false" foreign-key="none"&gt; </code></pre> <p>as mentioned in <a href="http://blog.xebia.com/2007/02/let-hibernate-connect-your-world/" rel="nofollow">Let Hibernate Connect Your World!</a> (see the page sources - xml configuration is not shown on the page)</p> <p><strong>Note:</strong></p> <p>This does not solve the whole problem however. Hibernate cannot get the right data through this mapping table for <code>getAdmin</code> and <code>getManagers</code> as well, because it looks to <code>Role_Group</code>, finds <code>RoleIDs</code> for <code>DiscussionGroup</code> <code>GroupID</code> and has no idea if it is for <code>AdminRole</code> or <code>ManagerRole</code> and gives "<em>No row with the given identifier exists" error</em>".</p> <p>Simimilar mapping works however when I use such table in Group or DiscussionGroup as <code>public Set&lt;Role&gt; getRoles()</code>, Hibernate will successfully load derived classes (<code>AdminRole</code>, <code>ManagerRole</code>) to the Set.</p>
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