JSF2 preRenderComponent is called always when f:ajax is executed

Question

I have an JSF page backed by NewsBean.java which has as bean initializer. There is a button at the bottom of the page for sending comments which has: and is surrounded by an . When button is clicked, NewsBean.init() is always called. My bean scope is view. Is this a valid behavior (calling always init())? How can I prevent always calling init()? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

A preRender listener is always invoked on pre render event, regardless of if it's an initial request or a postback request. Every single request has a render response phase, regardless of if it's a normal request or ajax request. So this behaviour is by specification. You need to check yourself in the listener method if it's a postback request or not by checking FacesContext#isPostback(). public void sendComment() { if (!FacesContext.getCurrentInstance().isPostback()) { // ... } } The (where Xxx can be View or Component) is by the way in essence a "workaround approach" for the functional requirement of being able to invoke a bean action method after the view parameters are been processed on the initial request. In the upcoming JSF 2.2 a new tag will be introduced which should do exactly the job as intented: This tag supports an onPostback attribute which already defaults to false: JSF 2.2 will be released the first quart of 2012. Snapshot releases of JSF 2.2 are currently already available.