diff --git a/core/pom.xml b/core/pom.xml
index a01d96b940b87bcb154af7970e2241d444ed3e3e..2a74e3d87ba0936e3bb718aa8fc9eb7c186c46f2 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -236,7 +236,7 @@
     <dependency>
       <groupId>org.kohsuke.stapler</groupId>
       <artifactId>stapler</artifactId>
-      <version>1.21</version>
+      <version>1.22</version>
     </dependency>
     <dependency>
       <groupId>antlr</groupId>
diff --git a/core/src/main/java/hudson/PluginManager.java b/core/src/main/java/hudson/PluginManager.java
index 319c825a74a3b1ac0bb6388fafb5152a827c81e4..a23ee2899a173e8460f49e4d67ed108edd098565 100644
--- a/core/src/main/java/hudson/PluginManager.java
+++ b/core/src/main/java/hudson/PluginManager.java
@@ -71,7 +71,7 @@ public final class PluginManager {
         }
         for( File arc : archives ) {
             try {
-                PluginWrapper p = new PluginWrapper(this, arc);
+                PluginWrapper p = new PluginWrapper(this,arc);
                 plugins.add(p);
                 if(p.isActive())
                     activePlugins.add(p);
diff --git a/core/src/main/java/hudson/PluginWrapper.java b/core/src/main/java/hudson/PluginWrapper.java
index 6b089fbb5cdfeb288a777962812556bd731311c5..cf64ab356e32e179df49007e64d0a42229e15a40 100644
--- a/core/src/main/java/hudson/PluginWrapper.java
+++ b/core/src/main/java/hudson/PluginWrapper.java
@@ -1,6 +1,5 @@
 package hudson;
 
-import hudson.model.Hudson;
 import hudson.util.IOException2;
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.Project;
@@ -114,7 +113,7 @@ public final class PluginWrapper {
      *      if an installation of this plugin failed. The caller should
      *      proceed to work with other plugins.
      */
-    public PluginWrapper(File archive) throws IOException {
+    public PluginWrapper(PluginManager owner, File archive) throws IOException {
         LOGGER.info("Loading plugin: "+archive);
         this.archive = archive;
 
@@ -181,7 +180,7 @@ public final class PluginWrapper {
 
             this.baseResourceURL = expandDir.toURL();
         }
-        ClassLoader dependencyLoader = new DependencyClassLoader(getClass().getClassLoader());
+        ClassLoader dependencyLoader = new DependencyClassLoader(getClass().getClassLoader(),owner);
         this.classLoader = new URLClassLoader(paths.toArray(new URL[0]), dependencyLoader);
 
         disableFile = new File(archive.getPath()+".disabled");
@@ -449,17 +448,19 @@ public final class PluginWrapper {
      * Used to load classes from dependency plugins.
      */
     final class DependencyClassLoader extends ClassLoader {
-        public DependencyClassLoader(ClassLoader parent) {
+        private final PluginManager manager;
+
+        public DependencyClassLoader(ClassLoader parent, PluginManager manager) {
             super(parent);
+            this.manager = manager;
         }
 
         protected Class<?> findClass(String name) throws ClassNotFoundException {
-            PluginManager m = Hudson.getInstance().getPluginManager();
             for (Dependency dep : dependencies) {
-                PluginWrapper p = m.getPlugin(dep.shortName);
+                PluginWrapper p = manager.getPlugin(dep.shortName);
                 if(p!=null)
                     try {
-                        p.classLoader.loadClass(name);
+                        return p.classLoader.loadClass(name);
                     } catch (ClassNotFoundException _) {
                         // try next
                     }