logback.xml (or other resources) not found in Tomcat

Question

I'm developing a web application using Logback as logging framework, and am testing it in Tomcat 6. For some reason, logback.xml does not get read.

• logback.xml is in WEB-INF/classes.
• Logback itself is in WEB-INF/lib.
• I'm using SLF4J.
• Logback is used: I see log messages in catalina.out, and LoggerFactory.getLogger(...) returns logback logger instances.
• I've already reloaded the app and even restarted Tomcat.

Any idea what's going on?

Update: It appears something deeper is going on. These return null:

// in a servlet
getClass().getClassLoader().getResource("/logback.xml");
getClass().getClassLoader().getResource("MyServlet.class");

When I log the classloader, everything appears fine:

22:32:11.221 [http-8080-1] INFO test.MyServlet - WebappClassLoader
  context: /test
  delegate: false
  repositories:
     /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@630f41e9

Answer 1

It was a Linux permission thing. Some directory lacked read/execute permissions. I accidentally fixed it when I ran into more problems with that.