From a7ae7b8912ecec19a1ded80c2f723f7feec0812f Mon Sep 17 00:00:00 2001
From: Junfan Zhang <zuston@apache.org>
Date: Mon, 23 Oct 2023 17:20:13 +0800
Subject: [PATCH] YARN-11597. Fix NPE when loading static files in SLSWebApp

---
 .../src/main/java/org/apache/hadoop/yarn/sls/web/SLSWebApp.java  | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/web/SLSWebApp.java b/hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/web/SLSWebApp.java
index a2974615c4c67..ce36854bca2fd 100644
--- a/hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/web/SLSWebApp.java
+++ b/hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/web/SLSWebApp.java
@@ -136,6 +136,7 @@ public void start() throws Exception {
     String webRootDir = getClass().getClassLoader().getResource("html").
         toExternalForm();
     staticHandler.setResourceBase(webRootDir);
+    staticHandler.start();
 
     Handler handler = new AbstractHandler() {
       @Override