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command button validations

 
Greenhorn
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I am creating a small user interface where i got to validate the command buttons.For ex i have a commed button called start or stop,If nothing is selected and the command button is clicked i should get a message called "none of the items are selected"

Can anyone please help me with the sample code
 
Greenhorn
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Just write an action method:

<h:commandButton value="Submit" action="#{myBackingBean.submit}" />

 
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