You can drag the Message Group component 
from
the Palette's Basic category to the Visual Designer to create a list of global messages
for a page, such as system runtime errors, or a list of messages related to components. To show individual component errors, such as
validation and conversion errors, deselect
the showGlobalOnly property in the Message Group Properties Window.
The two message components, Message Group and Message, display error messages concerning component rendering and validation.
- This component, Message Group, reports either global errors only or all errors on all
components on the page, including errors with the page itself.
You can put a Message Group component on your page to assist
with debugging as you are developing the page.
- The Message component
reports errors for a single component. Use Message
if you want to provide your users with messages related to a specific component, like validation errors when they enter invalid data in a field. Message Group also reports validation errors, but it reports them for all components, not just one.
-
You can send your own error text to a Message Group component by calling the corresponding Java object's info, error, fatal, or warn method. The component displays an appropriate icon for the type of method called.
You can also write your own input validation methods, which can write text to the Message Group component by throwing ValidatorException(new FacesMessage (String)). If you do not want to throw an exception, you can have the validation method call the Java object's info, error, fatal, or warn method instead.
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