8355914: [17u] Backout backport of JDK-8320687

Author: GoeLin

src/jdk.internal.jvmstat/share/classes/sun/jvmstat/monitor/MonitoredHost.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2004, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -50,7 +50,7 @@
  * @see HostListener
  */
 public abstract class MonitoredHost {
-    private static final Map<HostIdentifier, MonitoredHost> monitoredHosts =
+    private static Map<HostIdentifier, MonitoredHost> monitoredHosts =
                 new HashMap<HostIdentifier, MonitoredHost>();
 
     /*
@@ -133,6 +133,13 @@ public static MonitoredHost getMonitoredHost(VmIdentifier vmid)
         return getMonitoredHost(hostId);
     }
 
+
+    /*
+     * Load the MonitoredHostServices
+     */
+    private static ServiceLoader<MonitoredHostService> monitoredHostServiceLoader =
+        ServiceLoader.load(MonitoredHostService.class, MonitoredHostService.class.getClassLoader());
+
     /**
      * Factory method to construct a MonitoredHost instance to manage the
      * connection to the host indicated by {@code hostId}.
@@ -160,12 +167,9 @@ public static MonitoredHost getMonitoredHost(HostIdentifier hostId)
 
         hostId = resolveHostId(hostId);
 
-        ServiceLoader<MonitoredHostService> services = ServiceLoader.load(
-                MonitoredHostService.class, MonitoredHostService.class.getClassLoader());
-        for (MonitoredHostService mhs : services) {
+        for (MonitoredHostService mhs : monitoredHostServiceLoader) {
             if (mhs.getScheme().equals(hostId.getScheme())) {
                 mh = mhs.getMonitoredHost(hostId);
-                break;
             }
         }