JSF 2.x Conditional error messages

To conditionally show a Twitter Bootstrap styled DIV with a list of error messages, use the rendered property on panelGroup to check whether messageList has messages to be displayed, and if so, render the enclosed content.

layout=”block” displays the output as a DIV, and row is one of the Bootstrap classes for row display.

<div class="span12 alert alert-danger"></div>

Set messages to display from your Backing Bean with:

FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("your message");

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