Merge pull request #3881 from oleg-nenashev/java11/JENKINS-55085-revert-uc-for-ga

[JENKINS-55085] - Use the main update center by default when running with Java 11

core/src/main/java/hudson/model/UpdateCenter.java

@@ -216,15 +216,8 @@ public class UpdateCenter extends AbstractModelObject implements Saveable, OnMas
         if (ucOverride != null) {
             logger.log(Level.INFO, "Using a custom update center defined by the system property: {0}", ucOverride);
             UPDATE_CENTER_URL = ucOverride;
-        } else if (JavaUtils.isRunningWithJava8OrBelow()) {
-            UPDATE_CENTER_URL = "https://updates.jenkins.io/";
         } else {
-            //TODO: Rollback the default for Java 11 when it goes to GA
-            String experimentalJava11UC = "https://updates.jenkins.io/temporary-experimental-java11/";
-            logger.log(Level.WARNING, "Running Jenkins with Java {0} which is available in the preview mode only. " +
-                    "A custom experimental update center will be used: {1}",
-                    new Object[] {System.getProperty("java.specification.version"), experimentalJava11UC});
-            UPDATE_CENTER_URL = experimentalJava11UC;
+            UPDATE_CENTER_URL = "https://updates.jenkins.io/";
         }
     }