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  1. PO
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    <p>The component <code>id</code> should indeed be unique. This is implicitly required by the HTML specification. You know, all JSF does is just generating the appropriate HTML/CSS/JS code. Give them all a different <code>id</code> or just leave it away, it has no additional value in this specific situation (unless you'd like to hook some CSS/JS on it).</p> <p>To achieve your functional requirement, you may find <code>f:setPropertyActionListener</code> useful.</p> <pre><code>&lt;h:commandButton action="answer" value="+"&gt; &lt;f:setPropertyActionListener target="#{calculator.operation}" value="+" /&gt; &lt;/h:commandButton&gt; &lt;h:commandButton action="answer" value="-"&gt; &lt;f:setPropertyActionListener target="#{calculator.operation}" value="-" /&gt; &lt;/h:commandButton&gt; &lt;h:commandButton action="answer" value="*"&gt; &lt;f:setPropertyActionListener target="#{calculator.operation}" value="*" /&gt; &lt;/h:commandButton&gt; &lt;h:commandButton action="answer" value="/"&gt; &lt;f:setPropertyActionListener target="#{calculator.operation}" value="/" /&gt; &lt;/h:commandButton&gt; </code></pre> <p>And have a property <code>operation</code> in your <code>calculator</code> managed bean:</p> <pre><code>private String operation; // +setter. </code></pre> <p>You can access it in the <code>getAnswer()</code> method and handle accordingly.</p> <hr> <p>Alternatively, let the buttons each point to a different bean action but which returns all <code>"answer"</code>:</p> <pre><code>&lt;h:commandButton action="#{calculator.add}" value="+" /&gt; &lt;h:commandButton action="#{calculator.substract}" value="-" /&gt; &lt;h:commandButton action="#{calculator.multiply}" value="*" /&gt; &lt;h:commandButton action="#{calculator.divide}" value="/" /&gt; </code></pre> <p>with the following methods in your <code>calculator</code> managed bean:</p> <pre><code>public String add() { answer = number1 + number2; return "answer"; } public String substract() { answer = number1 - number2; return "answer"; } // etc... </code></pre> <p>and just let <code>getAnswer()</code> return <code>answer</code> and do nothing else there. That's a more clean separation of responsibilities.</p>
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    1. POGlassfish complaining about JSF component IDs
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    1. CO_The component id should indeed be unique._ - unique to the `NamingContainer` anyway, but that's probably not a topic a beginner wants to get into.
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    2. CO@McDowell: I already hesitated to add this info, but I decided to keep this detail away :)
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    3. COBalusC - That worked PERFECTLY!!! Thank you.
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