In order to support jdk1.6 reduce jetty version

pom.xml

@@ -33,7 +33,7 @@
         <dependency>
             <groupId>org.eclipse.jetty.aggregate</groupId>
             <artifactId>jetty-all</artifactId>
-            <version>8.1.21.v20160908</version>
+            <version>8.1.2.v20120308</version>
         </dependency>