Fix up the JettyAppServer

After the Jetty update is was only serving from the
StaticResourceHandler, and none of the other servlets.

Author: shs96c

java/client/test/org/openqa/selenium/environment/webserver/JettyAppServer.java

@@ -36,6 +36,7 @@
 import org.seleniumhq.jetty9.server.handler.AllowSymLinkAliasChecker;
 import org.seleniumhq.jetty9.server.handler.ContextHandler.ApproveAliases;
 import org.seleniumhq.jetty9.server.handler.ContextHandlerCollection;
+import org.seleniumhq.jetty9.server.handler.HandlerList;
 import org.seleniumhq.jetty9.server.handler.ResourceHandler;
 import org.seleniumhq.jetty9.servlet.ServletContextHandler;
 import org.seleniumhq.jetty9.servlet.ServletHolder;
@@ -267,9 +268,13 @@ protected ServletContextHandler addResourceHandler(String contextPath, Path reso
     staticResource.setMimeTypes(mimeTypes);
 
     context.setContextPath(contextPath);
-    context.setHandler(staticResource);
     context.setAliasChecks(ImmutableList.of(new ApproveAliases(), new AllowSymLinkAliasChecker()));
 
+    HandlerList allHandlers = new HandlerList();
+    allHandlers.addHandler(staticResource);
+    allHandlers.addHandler(context.getHandler());
+    context.setHandler(allHandlers);
+
     handlers.addHandler(context);
 
     return context;