No, there isn't a smarter way in the common case. This is the way to do it. Perhaps you would have to set type="button" on the button. In this particular case (a button) a shortcut will be:

<a4j:commandButton value="Submit" action="#{actions.submitToDB}" reRender="Button0" /> 

If using JSF 2.0, you can do it with <f:ajax event="onclick" render="Button0" />, which has exactly the same semantics.

No, there isn't a smarter way in the common case. This is the way to do it. You will have to do the following

• set type="button" on the button.
• set the action on the <a4j:support> rather than on the button istself.

In this particular case (a button) a shortcut will be:

<a4j:commandButton value="Submit" action="#{actions.submitToDB}" reRender="Button0" />