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copied!<p>MyFaces can't be the cause, it has always worked in MyFaces for us and anyone else. We have however never really used Trinidad, so I took a look in the Trinidad source code. It <a href="http://grepcode.com/file/repo1.maven.org/maven2/org.apache.myfaces.trinidad/trinidad-impl/2.0.1/org/apache/myfaces/trinidadinternal/context/PartialViewContextImpl.java#PartialViewContextImpl._getIds%28java.lang.String%29" rel="nofollow">appears</a> that it returns <code>Collections#emptySet()</code> when there are no render IDs. This is however <a href="http://docs.oracle.com/javase/6/docs/api/java/util/Collections.html#emptySet%28%29" rel="nofollow">immutable</a>! This totally explains the exception you're facing.</p> <p>This is a rather astonishing bug in Trinidad. The <a href="http://docs.oracle.com/javaee/6/api/javax/faces/context/PartialViewContext.html#getRenderIds%28%29" rel="nofollow">javadoc</a> clearly says that the returned collection must be mutable.</p> <blockquote> <p>Return a <code>Collection</code> of client identifiers from the current request with the request parameter name <code>PARTIAL_RENDER_PARAM_NAME</code>. If there is no such request parameter, return an empty <code>Collection</code>. These client identifiers are used to identify components that will be processed during the render phase of the request processing lifecycle. <strong>The returned <code>Collection</code> is mutable.</strong></p> </blockquote> <p>If you like Trinidad, report it as a bug to the Trinidad guys. Otherwise just get rid of it. I don't see any reason to use it if you're already using PrimeFaces (and Tomahawk).</p>

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