HADOOP-12417. TestWebDelegationToken failing with port in use. Contributed by Mingliang Liu.

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -1129,6 +1129,9 @@ Release 2.8.0 - UNRELEASED
 
     HADOOP-12407. Test failing: hadoop.ipc.TestSaslRPC. (stevel)
 
+    HADOOP-12417. TestWebDelegationToken failing with port in use.
+    (Mingliang Liu via wheat9)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/security/token/delegation/web/TestWebDelegationToken.java

@@ -176,13 +176,8 @@ public class TestWebDelegationToken {
 
   protected Server createJettyServer() {
     try {
-      InetAddress localhost = InetAddress.getLocalHost();
-      ServerSocket ss = new ServerSocket(0, 50, localhost);
-      int port = ss.getLocalPort();
-      ss.close();
       jetty = new Server(0);
       jetty.getConnectors()[0].setHost("localhost");
-      jetty.getConnectors()[0].setPort(port);
       return jetty;
     } catch (Exception ex) {
       throw new RuntimeException("Could not setup Jetty: " + ex.getMessage(),
@@ -192,7 +187,7 @@ public class TestWebDelegationToken {
 
   protected String getJettyURL() {
     Connector c = jetty.getConnectors()[0];
-    return "http://" + c.getHost() + ":" + c.getPort();
+    return "http://" + c.getHost() + ":" + c.getLocalPort();
   }
 
   @Before