How to execute a bean method before page is rendered?

Question

What is the best approach to execute a method in a bean before the JSF page using that bean is rendered?

Update: I am trying to execute a method which would populate some data used by the JSF backing bean. This backing bean is used in a form on a JSP page, where I need some prepopulated data.

Answer 1

In JSF2 you can use system Event also.

<f:event type="preRenderView" listener="#{customerBean.loadData}"/>

Answer 2

Constructor of bean / post construct @PostConstruct methods will do it.

But the best approach is greatly depends on the functionality you are implementing ,