diff --git a/src/main/java/hudson/remoting/UserRequest.java b/src/main/java/hudson/remoting/UserRequest.java
index ff898c2d2..26ef41cba 100644
--- a/src/main/java/hudson/remoting/UserRequest.java
+++ b/src/main/java/hudson/remoting/UserRequest.java
@@ -34,6 +34,8 @@
 import java.io.Serializable;
 import java.io.NotSerializableException;
 import java.io.ObjectInputStream;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 /**
  * {@link Request} that can take {@link Callable} whose actual implementation
@@ -86,10 +88,40 @@ public UserRequest(Channel local, Callable<?,EXC> c) throws IOException {
         return result;
     }
 
+    private static boolean workaroundDone = false;
     protected UserResponse<RSP,EXC> perform(Channel channel) throws EXC {
         try {
             ClassLoader cl = channel.importedClassLoaders.get(classLoaderProxy);
 
+            // Allow forcibly load of a class, allows to workaround:
+            // @See        https://issues.jenkins-ci.org/browse/JENKINS-19445
+            // @Related    https://issues.tmatesoft.com/issue/SGT-451
+            final String clazz = System.getProperty(RemoteClassLoader.class.getName() + ".force", null);
+            if ( clazz != null && !workaroundDone) {
+                // Optimistic logging set.
+                String eventMsg = "Loaded";
+                Level logLevel = Level.INFO;
+                // java.lang classes can only be instantiated by the bootstrap Classloader.
+                // Guarantees that *all* threads with whatever Classloader in use, have the
+                // same mutex instance:    an intance of java.lang.Class<java.lang.Object>
+                synchronized(java.lang.Object.class)
+                {
+                    workaroundDone = true;
+                    try {
+                        final Class<?> loaded = Class.forName( clazz, true, cl );
+                    } catch (final ClassNotFoundException cnfe) {
+                        // not big deal, elevate log to warning and swallow exception
+                        eventMsg = "Couldn't find";
+                        logLevel = Level.WARNING;
+                    }
+                }
+                final Logger logger = Logger.getLogger(RemoteClassLoader.class.getName());
+                if( logger.isLoggable(logLevel) )
+                {
+                    logger.log(logLevel, "%s class '%s' using classloader: %s", new String[]{ eventMsg, clazz, cl.toString()} );
+                }
+            }
+
             RSP r = null;
             Channel oldc = Channel.setCurrent(channel);
             try {