tobago-example/tobago-example-demo/src/main/webapp/content/30-concept/22-exception-handler/Exception_Handler.xhtml

<?xml version="1.0" encoding="UTF-8"?>

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<ui:composition template="/main.xhtml"
                xmlns="http://www.w3.org/1999/xhtml"
                xmlns:demo="http://myfaces.apache.org/tobago/example/demo"
                xmlns:f="http://java.sun.com/jsf/core"
                xmlns:tc="http://myfaces.apache.org/tobago/component"
                xmlns:ui="http://java.sun.com/jsf/facelets">

  <p>Since Tobago 4.0.0 an AjaxExceptionHandler takes care of exceptions in ajax case.</p>
  <p><span class="#{demo:bootstrapClass('BADGE')} #{demo:bootstrapClass('BADGE_DANGER')}">Important!</span>
    The exception has to be thrown before the renderer phase.
    This is the case, in normal actions, but if you need e. g. some initialization of data in a page, you
    can achieve that with an
    <code class="language-markup">&lt;f:event type="preRenderView" listener="\#{bean.doSomeCriticalWork}"/></code>.</p>
  <p>The AjaxExceptionHandler take the first exception that occurs and try to find a proper error page.
    Error pages are defined in the web.xml.</p>
  <p>If no proper error page could be found, the error page for error code 500 is displayed instead.
    If no 500-error-page is defined, the general error page (no exceptiontype or error code defined) is used.</p>
  <p>If there is no ajax case, the error page could not be found or the renderer phase is active,
    the AjaxExceptionHandler do nothing and let JSF handle the exception.</p>

  <tc:section label="Example One">
    <p>The output field is updated after an change event of the input field.</p>
    <p>Set the input value to <b>'x'</b> to throw an exeption.</p>

    <tc:in id="inputAjax" label="Input" value="#{exceptionHandlerController.value}">
      <f:ajax render="outputAjax" listener="#{exceptionHandlerController.update}"/>
    </tc:in>
    <tc:out id="outputAjax" label="Output" value="#{exceptionHandlerController.value}"/>
  </tc:section>

  <tc:section label="Example Two">
    <p>This example use the <code class="language-markup">&lt;f:event type="preRenderView"/></code> tag.</p>
    <p>An exceptions is thrown after page 7 or higher is selected.</p>

    <f:event type="preRenderView" listener="#{exceptionHandlerController.preRenderViewListener}"/>

    <tc:sheet id="s1" value="#{exceptionHandlerController.solarList}" var="object" rows="4"
              state="#{exceptionHandlerController.sheetState}">
      <tc:style maxHeight="500px"/>
      <tc:column label="Name">
        <tc:out value="#{object.name}" labelLayout="skip"/>
      </tc:column>
      <tc:column label="Orbit">
        <tc:out value="#{object.orbit}" labelLayout="skip"/>
      </tc:column>
      <tc:column label="Period (Days)">
        <tc:out value="#{object.period}" labelLayout="skip"/>
      </tc:column>
      <tc:column label="Discoverer">
        <tc:out value="#{object.discoverer}" labelLayout="skip"/>
      </tc:column>
      <tc:column label="Year">
        <tc:out value="#{object.discoverYear}" labelLayout="skip"/>
      </tc:column>
    </tc:sheet>
  </tc:section>
</ui:composition>