title: Logback could not find external property file resource
body: <p>I am using logback version 1.0.13. 
  To read external property resource from logback, i used a JNDI entry (defined in Tomcat Context) :</p>
  
  <pre><code>...
  &lt;insertFromJNDI env-entry-name="java:comp/env/app.config.path" as="app.config.path" /&gt; 
  &lt;property resource="${app.config.path}" /&gt;
  ....
  </code></pre>
  
  <p>Problem : logback not find my JNDI resource : ${app.config.path}=file:///D:/temp/application.properties</p>
  
  <pre><code>ERROR in ch.qos.logback.core.joran.action.PropertyAction - Could not find resource [file:///D:/temp/application.properties]
  </code></pre>
  
  <p>not work with other URLs like :  <code>file://D:/, file:/D:/, file:////D:/,...</code></p>
  
  <p>Any suggestions?</p>