How to forward JSF RI (Mojarra) log to slf4j or log4j?

Question

How to teach Mojarra to use slf4j or log4j?

According to slf4j documentation I have to call:

org.slf4j.bridge.SLF4JBridgeHandler.install();

Somewhere in my project. But I can't call it in Mojarra... So, the question is when and how shall I execute this install() method?

score 2 · Accepted Answer · answered Apr 20 '11 at 18:50

2

The best way to do it is through a custom Listener. Being initialized before JSF servlet it should configure jul-to-slf4j bridge in contextInitialized(ServletContextEvent).

answered Apr 20 '11 at 18:50

yegor256

score 0 · Answer 2 · answered Feb 26 '11 at 09:07

0

I believe Mojarra, being Sun code, uses java.util.logging.

The slf4j project download contains a drop-in module which forwards all j.u.l statements to slf4j. You can then use log4j as the slf4j backend.

answered Feb 26 '11 at 09:07

This is what I had to do in order to make Jersey use slf4j: http://stackoverflow.com/questions/4121722. Shall I do the same "hacking" with Mojarra? :( – yegor256 Feb 26 '11 at 09:16
Your question did not mention running inside junit. Also junit tests should not depend on logging. – Thorbjørn Ravn Andersen Feb 26 '11 at 10:01
Well, either in junit tests or not, I still can't understand how to inject this Bridge initialization **before** Mojarra initialization... – yegor256 Feb 26 '11 at 10:15
Mojarra is a JSF 2.0 implementation, i.e. a library. The code using the library needs to do the initialization. – Thorbjørn Ravn Andersen Feb 26 '11 at 10:25
Totally agree. But where this initialization can be done? Mojarra's `FacesServlet` is instantiated by JEE container, according to `web.xml` details. Is it possible to inject my own code in between? – yegor256 Feb 26 '11 at 11:52
Look at Arquillian for unit testing Java EE code. http://www.jboss.org/arquillian – Thorbjørn Ravn Andersen Feb 26 '11 at 12:19

2 Answers2