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    <p>It's important to know and understand that the <code>&lt;f:convertNumber&gt;</code> tag uses <a href="http://docs.oracle.com/javase/7/docs/api/java/text/DecimalFormat.html" rel="nofollow"><code>DecimalFormat</code></a> under the covers. You can find all pattern characters in <a href="http://docs.oracle.com/javase/7/docs/api/java/text/DecimalFormat.html" rel="nofollow">its javadoc</a>.</p> <p>It seems that you expected that the <code>DecimalFormat</code> pattern characters <code>,</code> and <code>.</code> are also actually used in the final format. This is untrue. It are really merely <em>pattern characters</em> (like as <code>d</code>, <code>M</code>, <code>y</code>, etc as used by<code>SimpleDateFormat</code>). Basically, the pattern character <code>,</code> tells <code>DecimalFormat</code> to print the "grouping separator" as specified by the given locale and, equivalently, the pattern character <code>.</code> tells <code>DecimalFormat</code> to print the "decimal separator" as specified by the given locale.</p> <p>In effects, the actual character being printed depends on the given locale. For English locale (<code>locale="en"</code>), the "grouping separator" being printed is just coincidentally also <code>,</code>, but for German locale (<code>locale="de"</code>) the "grouping separator" being printed is indeed <code>.</code>.</p> <hr> <p><strong>Unrelated</strong> to the concrete problem, the <code>type</code> attribute of <code>&lt;f:convertNumber&gt;</code> has totally no effect if the <code>pattern</code> attribute is specified. The <code>type</code> attribtue is basically superfluous in this example and can safely be removed without any side effects.</p> <p>If you remove the <code>pattern</code> attribute, then it'll actually be used and you'll see that the default pattern for a currency is being used, which is same as <code>¤#,##0.00</code> for English locale and <code>¤ #,##0.00</code> for German locale. Also note that the pattern character representing the currency symbol is not <code>$</code>, but <code>¤</code>. The currency symbol can be set separately via <code>currencySymbol</code> attribute. So the correct approach for currencies would be:</p> <pre class="lang-html prettyprint-override"><code>&lt;f:convertNumber type="currency" locale="#{userSession.locale}" currencySymbol="$" /&gt; </code></pre> <p>Again, see the <code>DecimalFormat</code> javadoc as linked before.</p>
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    1. PODoes <f:convertNumber> use the right number separator when using patterns to format currency?
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    1. PODoes <f:convertNumber> use the right number separator when using patterns to format currency?
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    1. COThank you!!! Great answer as always :). I need to use a customised pattern because Java always put the currency symbol as a prefix. For Chinese, I need suffix to represent money number like `pattern="###,###.### 元"`. The `type="currency"` is more for self-documenting purpose :P.
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    2. COI do have another question though. Is there a reason why `<f:convertNumber>` cannot set the `currencySymbol` based on the locale? If I need to set it manually, I suppose it'd require using a `ResourceBundle` to store the symbol for different languages, am I right?
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    3. COBecause the currency is not necessarily locale specific. More than often prices are shown in a fixed currency (e.g. dollars or euros only). Only the currency format is locale specific. And yes, you can use a resource bundle to hold the actual currency symbols.
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