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PrimeFaces User Guide
Exception Information
In the error page, information about the exception is provided via the pfExceptionHandler EL
keyword. Here is the list of exposed properties.
- exception: Throwable instance.
- type: Type of the exception.
- message: Exception message:
- stackTrace: An array of java.lang.StackTraceElement instances.
- formattedStackTrace: Stack trace as presentable string.
- timestamp: Timestamp as date.
- formattedTimestamp: Timestamp as presentable string.
In error page, exception metadata is accessed using EL;
<h:outputText value="Message:#{pfExceptionHandler.message}" />
<h:outputText value="#{pfExceptionHandler.formattedStackTrace}" escape="false" />
Ajax Exception Handler Component
A specialized exception handler component provides a way to execute callbacks on client side,
update other components on the same page. This is quite useful in case you don't want to create a
separate error page. Following example shows the exception in a dialog on the same page.
<p:ajaxExceptionHandler type="javax.faces.application.ViewExpiredException"
update="exceptionDialog" onexception="PF('exceptionDialog').show();" />
<p:dialog id="exceptionDialog" header="Exception: #{pfExceptionHandler.type}
occured!" widgetVar="exceptionDialog" height="500px">
Message: #{pfExceptionHandler.message} <br/>
StackTrace: <h:outputText value="#{pfExceptionHandler.formattedStackTrace}"
escape="false" />
<p:button onclick="document.location.href = document.location.href;"
value="Reload!"/>
</p:dialog>
Ideal location for p:ajaxExceptionHandler component is the facelets template so that it gets
included in every page. Refer to component documentation of p:ajaxExceptionHandler for the
available attributes.
Render Response Exceptions
To support exception handling in the RENDER_RESPONSE phase, it's required to set the
javax.faces.FACELETS_BUFFER_SIZE parameter. Otherwise you will probably see a
ServletException with "Response already committed" message.
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