How to update jsf component from a jsf backing bean method?

Using PrimeFaces specific API, use PrimeFaces.Ajax#update (). Or if you're not on PrimeFaces 6.2+ yet, use RequestContext#update (). If you happen to use JSF utility library OmniFaces, use Ajax#update ().
Just so, how to refresh a JSF component from a backing bean?
Re: refresh jsf component from backing bean The only thing you need to do for this is to specify IDs of components as value of "reRender" attribute for RF AJAX component. You can bind reRender attribute to bean property, so that it will be dynamic.
Subsequently, what is the use of Managed Beans in JSF? JSF - Managed Beans. Managed Bean is a regular Java Bean class registered with JSF. In other words, Managed Beans is a Java bean managed by JSF framework. Managed bean contains the getter and setter methods, business logic, or even a backing bean (a bean contains all the HTML form value). Managed beans works as Model for UI component.
Furthermore, how to use @PostConstruct in @JSF when Bean created?
JSF 2.2 has a new feature which performs this task using viewAction. @PostConstruct is run ONCE in first when Bean Created. the solution is create a Unused property and Do your Action in Getter method of this property and add this property to your .xhtml file like this :
In fact, how to update the component from the backing bean?
In order to updte the component from backing bean, we can achieve as below RequestContext.getCurrentInstance ().update ('updatePanelGroup'); Updating the component differs with respect to prima face version. Thanks for contributing an answer to Stack Overflow!

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