Merge pull request #1725 from liorhson/JENKINS-27289-update

Contine the JENKINS-27289 ticket: update the getResources as well

core/src/main/java/hudson/util/MaskingClassLoader.java

@@ -23,11 +23,14 @@
  */
 package hudson.util;
 
+import java.io.IOException;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
+import java.util.Enumeration;
+import java.util.Collections;
 
 /**
  * {@link ClassLoader} that masks a specified set of classes
@@ -74,18 +77,30 @@ public class MaskingClassLoader extends ClassLoader {
 
     @Override
     public synchronized URL getResource(String name) {
-        for (String mask : masksResources) {
-            if(name.startsWith(mask))
-                return null;
-        }
+        if (isMasked(name)) return null;
 
         return super.getResource(name);
     }
 
+    @Override
+    public Enumeration<URL> getResources(String name) throws IOException {
+        if (isMasked(name)) return Collections.emptyEnumeration();
+
+        return super.getResources(name);
+    }
+
     public synchronized void add(String prefix) {
         masksClasses.add(prefix);
         if(prefix !=null){
             masksResources.add(prefix.replace(".","/"));
         }
     }
+
+    private boolean isMasked(String name) {
+        for (String mask : masksResources) {
+            if(name.startsWith(mask))
+                return true;
+        }
+        return false;
+    }
 }