this class is not meant for sub-classing

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@11303 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/WebAppMain.java

@@ -45,7 +45,7 @@ import java.util.logging.Logger;
  *
  * @author Kohsuke Kawaguchi
  */
-public class WebAppMain implements ServletContextListener {
+public final class WebAppMain implements ServletContextListener {
     private final RingBufferLogHandler handler = new RingBufferLogHandler();
     private static final String APP = "app";