423392 - GzipFilter without wrapping or blocking

ensure that servlets are enabled for demo

jetty-distribution/pom.xml

@@ -502,7 +502,7 @@
 	      <arguments>
 		<argument>jetty.home=${assembly-directory}</argument>
 		<argument>jetty.base=${assembly-directory}/demo-base</argument>
-		<argument>--add-to-start=server,continuation,deploy,jsp,ext,resources,client,annotations,jndi</argument>
+		<argument>--add-to-start=server,continuation,deploy,jsp,ext,resources,client,annotations,jndi,servlets</argument>
 		<argument>--add-to-startd-ini=http,https</argument>
 	      </arguments>
 	    </configuration>

jetty-servlet/src/main/java/org/eclipse/jetty/servlet/BaseHolder.java

@@ -94,7 +94,7 @@ public abstract class BaseHolder<T> extends AbstractLifeCycle implements Dumpabl
             {
                 _class=Loader.loadClass(Holder.class, _className);
                 if(LOG.isDebugEnabled())
-                    LOG.debug("Holding {}",_class);
+                    LOG.debug("Holding {} from {}",_class,_class.getClassLoader());
             }
             catch (Exception e)
             {

jetty-webapp/src/main/java/org/eclipse/jetty/webapp/WebAppContext.java

@@ -130,7 +130,6 @@ public class WebAppContext extends ServletContextHandler implements WebAppClassL
         "-org.eclipse.jetty.jaas.",         // don't hide jaas classes
         "-org.eclipse.jetty.servlets.",     // don't hide jetty servlets
         "-org.eclipse.jetty.servlet.DefaultServlet", // don't hide default servlet
-        "-org.eclipse.jetty.servlets.AsyncGzipFilter", // special case for AsyncGzipFilter
         "-org.eclipse.jetty.servlet.listener.", // don't hide useful listeners
         "-org.eclipse.jetty.websocket.",    // don't hide websocket classes from webapps (allow webapp to use ones from system classloader)
         "org.eclipse.jetty."                // hide other jetty classes