Using the

<f:convertNumber/>

together with It seems that the BigDecimal results in a java.lang.IllegalArgumentException: java.lang.ClassCastException. To get around this, either use

<f:converter converterId="javax.faces.BigDecimal"/>

or use your own converter, eg:

import java.math.BigDecimal;
import javax.faces.component.UIComponent;
import javax.faces …

Sometimes an AJAX request takes some time. Because of the asynchronous of AJAX the user does not note that there is something happening on the server. So it is a nice thing to display the status of the request.

Using Richfaces/A4J you can use the tag to display such …

Today I spent quite some time to figure out why the following piece of code causes a Duplicate Id Error Message.

...
    <rich:columns value="#{myBean.listWithFields}" var="field" index="myIndex">
        <h:inputText id="#{field.identifier}" value="#{field.value}" rendered="#{field.inputField}"/>
        <h:outputText id="#{field.identifier}" value="#{field.value}" rendered …

Just use the escape attribute to avoid HTML code to be encoded again.\

For example with the following JSF fragment

...
    <h:outputText value="#{messages['TITEL']}" escape="false"/>
...

this part of the message.properties is displayed correct

TITEL=About Ü and Ö

If you get the Exception

...
    javax.faces.el.PropertyNotFoundException
...

the specified property cannot be found in the bean.

First thing is to check the accessors and their accessibility. In my case I had all needed accessors and their accessibility, but they were specified in an Inner Class within the bean …

Using in comments in JSF web pages seems to be a kind of a problem. At least using Apache MyFaces (http://myfaces.apache.org) / Apache MyFaces Tomahawk (http://myfaces.apache.org/tomahawk/) or JBoss Seam (http://www.seamframework.org), because these two implementation just don’t interpret comments as comments …