title: GWT 2.6 Console Warnings
body: <p>What does these warnings mean?</p>
  
  <pre><code>[WARN] Server class 'org.eclipse.jetty.servlet.listener.ELContextCleaner' could not be found in the web app, but was found on the system classpath
     [WARN] Adding classpath entry 'file:/Applications/gwt/gwt-2.6.0/gwt-dev.jar' to the web app classpath for this session
     For additional info see: file:/Applications/gwt/gwt-2.6.0/doc/helpInfo/webAppClassPath.html
  [WARN] Server class 'org.slf4j.Logger' could not be found in the web app, but was found on the system classpath
     [WARN] Adding classpath entry 'file:/Users/mg/Documents/Grails/GGTS3.5M1/buddyis/lib/gwt/slf4j-api-1.7.5.jar' to the web app classpath for this session
     For additional info see: file:/Applications/gwt/gwt-2.6.0/doc/helpInfo/webAppClassPath.html
  [WARN] Server class 'org.slf4j.impl.StaticLoggerBinder' could not be found in the web app, but was found on the system classpath
     [WARN] Adding classpath entry 'file:/Users/mg/Documents/Grails/GGTS3.5M1/buddyis/lib/gwt/mobile/slf4j-log4j12-1.7.5.jar' to the web app classpath for this session
     For additional info see: file:/Applications/gwt/gwt-2.6.0/doc/helpInfo/webAppClassPath.html
  [WARN] Server class 'org.apache.log4j.Level' could not be found in the web app, but was found on the system classpath
     [WARN] Adding classpath entry 'file:/Users/mg/Documents/Grails/GGTS3.5M1/buddyis/lib/gwt/mobile/log4j-1.2.17.jar' to the web app classpath for this session
     For additional info see: file:/Applications/gwt/gwt-2.6.0/doc/helpInfo/webAppClassPath.html
  log4j:WARN No appenders could be found for logger (org.eclipse.jetty.util.log).
  log4j:WARN Please initialize the log4j system properly.
  log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
  log4j:WARN No appenders could be found for logger (org.apache.jasper.compiler.JspRuntimeContext).
  log4j:WARN Please initialize the log4j system properly.
  log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
  </code></pre>