[GitHub] [spark] srowen commented on a change in pull request #24088: [SPARK-27122][core] Jetty classes must not be return via getters in org.apache.spark.ui.WebUI

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srowen commented on a change in pull request #24088: [SPARK-27122][core] Jetty classes must not be return via getters in org.apache.spark.ui.WebUI
URL: https://github.com/apache/spark/pull/24088#discussion_r265918236
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/ui/WebUI.scala
 ##########
 @@ -193,3 +208,32 @@ private[spark] abstract class WebUIPage(var prefix: String) {
   def render(request: HttpServletRequest): Seq[Node]
   def renderJson(request: HttpServletRequest): JValue = JNothing
 }
+
+private[spark] class DelegatingServletContextHandler(handler: ServletContextHandler) {
+
+  def prependFilterMapping(
+      filterName: String,
+      spec: String,
+      types: EnumSet[DispatcherType]): Unit = {
+    val mapping = new FilterMapping
 
 Review comment:
   Nit: () for constructors

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