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<blockquote> <p>Thank you for you answer. But if i had this. the suiteVersion is also deleted. I just want the row in the table of associations suiteVersion -> moduleVersion be deleted.</p> </blockquote> <p>I think I got it now: you want to <em>break</em> an association and to get the corresponding record removed from the join table. That's not what I understood from the original question. Anyway... </p> <p>To do so, well, you have to do what I wrote, to break the association, i.e. to remove the corresponding entities from their respective association collection (you have to update both sides of the link too since it's a bidirectional association). Something like this:</p> <pre><code>session.getTransaction().begin(); SuiteVersion suite = ... // retrieved in some way ModuleVersion module = ... // retrieved in some way suite.getModuleVersions().remove(module); module.getSuiteVersions().remove(suite); session.getTransaction().commit(); // the "association" record should get removed </code></pre> <p>But I suggest using helper methods:</p> <pre><code>@Entity public class SuiteVersion { ... @ManyToMany private List<ModuleVersion> moduleVersions = new ArrayList<ModuleVersion>(); ... public void removeFromModuleVersions(ModuleVersion module) { this.moduleVersions.remove(module); module.getSuiteVersions().remove(this); } public void addToModuleVersions(ModuleVersion module) { this.moduleVersions.add(module); module.getSuiteVersions().add(this); } } </code></pre> <p>And then your code becomes:</p> <pre><code>session.getTransaction().begin(); SuiteVersion suite = ... // retrieved in some way ModuleVersion module = ... // retrieved in some way suite.removeFromModuleVersions(module); session.getTransaction().commit(); </code></pre> <h3>See also</h3> <ul> <li><a href="http://docs.jboss.org/hibernate/core/3.3/reference/en/html/tutorial.html#tutorial-associations-usingbidir" rel="nofollow noreferrer">1.2.6. Working bi-directional links</a></li> </ul> <hr> <p><strong>Update:</strong> Your "new" problem is a pure Java related problem: you can't modify a collection while iterating on it, at least not with your current approach. You need to use an <a href="http://download.oracle.com/javase/6/docs/api/java/util/Iterator.html" rel="nofollow noreferrer"><code>Iterator</code></a> and <a href="http://download.oracle.com/javase/6/docs/api/java/util/Iterator.html#remove%28%29" rel="nofollow noreferrer"><code>Iterator#remove()</code></a>. </p> <h3>Related questions</h3> <ul> <li><a href="https://stackoverflow.com/questions/223918/java-efficient-equivalent-to-removing-while-iterating-a-collection">Java: Efficient Equivalent to Removing while Iterating a Collection</a> </li> <li><a href="https://stackoverflow.com/questions/626671/java-how-to-remove-elements-from-a-list-while-iterating-over-adding-to-it">Java: How to remove elements from a list while iterating over/adding to it</a> </li> </ul>
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