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    <p>Nesting forms is illegal in HTML, so also in JSF since all it does is just generating HTML. You need to put them next to each other.</p> <p>If you have multiple buttons in the same form of which you'd like to skip certain validation on certain button press, then add <code>immediate="true"</code> to the button in question. This way all input fields which do <strong>not</strong> have <code>immediate="true"</code> will be skipped.</p> <h3>See also:</h3> <ul> <li><a href="https://stackoverflow.com/questions/4731740/doubt-on-immediate-attribute-for-command-button">What is the <code>immediate</code> attribute used for?</a></li> </ul> <hr> <p><strong>Update</strong>: OK, you want two physically separate forms inside a single form. If splitting the "God Form" in multiple forms with each its own responsibility is not an option, then there are several ways to go around this:</p> <p>If you don't use Ajax and you just have a <code>required="true"</code> on an input element which you actually want to make non-required when you press a certain button, then do:</p> <pre><code>&lt;h:form&gt; ... &lt;h:commandButton value="Submit form but but do not validate comment" /&gt; ... &lt;h:inputTextarea id="comment" required="#{not empty param[foo.clientId]}" immediate="true" /&gt; &lt;h:commandButton binding="#{foo}" value="Submit and validate comment" immediate="true" /&gt; &lt;/h:form&gt; </code></pre> <p>If you actually use Ajax, then just specify the execute region in <code>execute</code> attribute.</p> <pre><code>&lt;h:form&gt; &lt;h:panelGroup id="other"&gt; .... &lt;h:commandButton value="Submit form but but do not validate comment"&gt; &lt;f:ajax execute="other" render="other" /&gt; &lt;/h:commandButton&gt; &lt;/h:panelGroup&gt; &lt;h:panelGroup id="comments"&gt; &lt;h:inputTextarea required="#{not empty param[foo.clientId]}" /&gt; &lt;h:commandButton value="Submit and validate comment by ajax"&gt; &lt;f:ajax execute="comments" render="comments" /&gt; &lt;/h:commandButton&gt; &lt;/h:panelGroup&gt; &lt;/h:form&gt; </code></pre>
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    1. COThanks. Added immediate to comment-text and -button. Works for adding comments. Problem now is that it validates the comment when I save the parent.
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