title: slf4j upgrade binding update error ? incompatible binding
body: <p>I have a legacy java EE app that I am porting to the maven framework . the app initially used the slf4j 1.5x series for logging , I am upgrading to the 1.7.1 logger . I read on the slf4j site that </p>
  
  <p><a href="http://slf4j.org/faq.html#where_is_binding" rel="nofollow">http://slf4j.org/faq.html#where_is_binding</a></p>
  
  <blockquote>
    <p>Please note that all bindings depend on slf4j-api.jar.</p>
  </blockquote>
  
  <p>I upgraded my slf4j-api.jar to 1.7 and did with slf4j-simple and slf4j-log4j12 too . I still seem to be getting errors of an incompatible binding which is quite frankly driving me up an wall . Any help would be appreciated </p>
  
  <pre><code>INFO: validateJarFile(C:\Users\adam\apache-tomcat-7.0.42\webapps\ myWebApp\WEB-INF\lib\geronimo-servlet_2.5_spec-1.2.jar) - jar not loaded.
   See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
  
  Oct 14, 2013 1:57:42 PM org.apache.catalina.loader.WebappClassLoader validateJar
  File
  INFO: validateJarFile(C:\Users\adam\apache-tomcat-7.0.42\webapps\ myWebApp\WEB-INF\lib\servlet-api-2.3.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
  
  Oct 14, 2013 1:57:42 PM org.apache.catalina.loader.WebappClassLoader validateJar
  File
  INFO: validateJarFile(C:\Users\adam\apache-tomcat-7.0.42\webapps\ myWebApp\WEB-INF\lib\servlet-api-2.5-6.1.11.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
  
  SLF4J: Class path contains multiple SLF4J bindings.
  
  SLF4J: Found binding in [jar:file:/C:/Users/adam/apache-tomcat-7.0.42/webapps/
  myWebApp/WEB-INF/lib/slf4j-log4j12-1.5.0.jar!/org/slf4j/impl
  /StaticLoggerBinder.class]
  
  SLF4J: Found binding in [jar:file:/C:/Users/adam/apache-tomcat-7.0.42/webapps/
  myWebApp/WEB-INF/lib/slf4j-simple-1.5.0.jar!/org/slf4j/impl/
  StaticLoggerBinder.class]
  
  SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
  
  SLF4J: slf4j-api 1.6.x (or later) is incompatible with this binding.
  
  SLF4J: Your binding is version 1.5.5 or earlier.
  
  SLF4J: Upgrade your binding to version 1.6.x.
  </code></pre>