Seam 1.2.1-GA, JSF 1.2, JBoss 4.2.1-GA I have some properties of type BigDecimal that I need to display with commas (e.g. 300,000.00). I can't use f:convertNumber's pattern: <h:inputText id="#{id}" size="10" value="#{value}" required="#{required}"> | <f:convertNumber pattern="#,##0.00" /> | </h:inputText> | since this results in a runtime error -- f:convertNumber creates a java.lang.Number -- which, sadly, BigDecimal does not conform to. /WEB-INF/facelets/tags/inputCurrency.xhtml @15,76 | value="#{value}": /capital/CapitalCallEdit.xhtml @37,81 | value="#{capitalCallHome.instance.callAmount}": | java.lang.IllegalArgumentException: argument type mismatch It's trying to pass a Long to the setCallAmount(BigDecimal val) setter: NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method] | NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39 | DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25 | Method.invoke(Object, Object...) line: 585 | BeanELResolver.setValue(ELContext, Object, Object, Object) line: 108 | FacesCompositeELResolver(CompositeELResolver).setValue(ELContext, Object, Object, Object) line: 68 | FacesCompositeELResolver.setValue(ELContext, Object, Object, Object) line: 93 | AstValue.setValue(EvaluationContext, Object) line: 114 | ValueExpressionImpl.setValue(ELContext, Object) line: 249 | TagValueExpression.setValue(ELContext, Object) line: 93 | AstIdentifier.setValue(EvaluationContext, Object) line: 66 | ValueExpressionImpl.setValue(ELContext, Object) line: 249 | TagValueExpression.setValue(ELContext, Object) line: 93 | HtmlInputText(UIInput).updateModel(FacesContext) line: 765 | HtmlInputText(UIInput).processUpdates(FacesContext) line: 697 | UIValidateAll(UIComponentBase).processUpdates(FacesContext) line: 1056 | UIDecorate(UIComponentBase).processUpdates(FacesContext) line: 1056 | HtmlPanel(UIComponentBase).processUpdates(FacesContext) line: 1056 | ... Is this a bug? I'm not certain - the Core JSF book (Geary/Horstman) suggests that f:convertNumber should work with BigDecimal in JSF 1.2, but I can't find any specific example that explicitly shows it should work. I can't find a way to use NumberFormat-style conversions with BigDecimal with any off the shelf converters. This seems to be something that many others would have encountered before me -- can anyone point me to a way to convert BigDecimal with a pattern format? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4079626#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...