--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java	Wed Jul 05 19:38:35 2017 +0200
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java	Fri Apr 25 14:20:07 2014 +0200
@@ -64,7 +64,6 @@
 import jdk.internal.org.objectweb.asm.Opcodes;
 import jdk.internal.org.objectweb.asm.Type;
 import jdk.internal.org.objectweb.asm.commons.InstructionAdapter;
-import jdk.nashorn.internal.objects.Global;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -132,23 +131,18 @@
  * implemented securely.
  */
 final class JavaAdapterBytecodeGenerator {
-    static final Type CONTEXT_TYPE       = Type.getType(Context.class);
-    static final Type OBJECT_TYPE        = Type.getType(Object.class);
-    static final Type SCRIPT_OBJECT_TYPE = Type.getType(ScriptObject.class);
-    static final Type GLOBAL_TYPE        = Type.getType(Global.class);
+    static final Type OBJECT_TYPE = Type.getType(Object.class);
 
-    static final String CONTEXT_TYPE_NAME = CONTEXT_TYPE.getInternalName();
     static final String OBJECT_TYPE_NAME  = OBJECT_TYPE.getInternalName();
 
     static final String INIT = "<init>";
 
     static final String GLOBAL_FIELD_NAME = "global";
 
-    static final String SCRIPT_OBJECT_TYPE_DESCRIPTOR = SCRIPT_OBJECT_TYPE.getDescriptor();
-    static final String GLOBAL_TYPE_DESCRIPTOR = GLOBAL_TYPE.getDescriptor();
+    // "global" is declared as Object instead of Global - avoid static references to internal Nashorn classes when possible.
+    static final String GLOBAL_TYPE_DESCRIPTOR = OBJECT_TYPE.getDescriptor();
 
-
-    static final String SET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE, GLOBAL_TYPE);
+    static final String SET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE, OBJECT_TYPE);
     static final String VOID_NOARG_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.VOID_TYPE);
 
     private static final Type SCRIPT_FUNCTION_TYPE = Type.getType(ScriptFunction.class);
@@ -159,7 +153,7 @@
             OBJECT_TYPE, STRING_TYPE, METHOD_TYPE_TYPE);
     private static final String GET_HANDLE_FUNCTION_DESCRIPTOR = Type.getMethodDescriptor(METHOD_HANDLE_TYPE,
             SCRIPT_FUNCTION_TYPE, METHOD_TYPE_TYPE);
-    private static final String GET_CLASS_INITIALIZER_DESCRIPTOR = Type.getMethodDescriptor(SCRIPT_OBJECT_TYPE);
+    private static final String GET_CLASS_INITIALIZER_DESCRIPTOR = Type.getMethodDescriptor(OBJECT_TYPE);
     private static final Type RUNTIME_EXCEPTION_TYPE = Type.getType(RuntimeException.class);
     private static final Type THROWABLE_TYPE = Type.getType(Throwable.class);
     private static final Type UNSUPPORTED_OPERATION_TYPE = Type.getType(UnsupportedOperationException.class);
@@ -171,7 +165,7 @@
     private static final String UNSUPPORTED_OPERATION_TYPE_NAME = UNSUPPORTED_OPERATION_TYPE.getInternalName();
 
     private static final String METHOD_HANDLE_TYPE_DESCRIPTOR = METHOD_HANDLE_TYPE.getDescriptor();
-    private static final String GET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(GLOBAL_TYPE);
+    private static final String GET_GLOBAL_METHOD_DESCRIPTOR = Type.getMethodDescriptor(OBJECT_TYPE);
     private static final String GET_CLASS_METHOD_DESCRIPTOR = Type.getMethodDescriptor(Type.getType(Class.class));
 
     // Package used when the adapter can't be defined in the adaptee's package (either because it's sealed, or because
@@ -528,11 +522,11 @@
     }
 
     private static void invokeGetGlobal(final InstructionAdapter mv) {
-        mv.invokestatic(CONTEXT_TYPE_NAME, "getGlobal", GET_GLOBAL_METHOD_DESCRIPTOR, false);
+        mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "getGlobal", GET_GLOBAL_METHOD_DESCRIPTOR, false);
     }
 
     private static void invokeSetGlobal(final InstructionAdapter mv) {
-        mv.invokestatic(CONTEXT_TYPE_NAME, "setGlobal", SET_GLOBAL_METHOD_DESCRIPTOR, false);
+        mv.invokestatic(SERVICES_CLASS_TYPE_NAME, "setGlobal", SET_GLOBAL_METHOD_DESCRIPTOR, false);
     }
 
     /**

--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterClassLoader.java	Wed Jul 05 19:38:35 2017 +0200
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterClassLoader.java	Fri Apr 25 14:20:07 2014 +0200
@@ -31,6 +31,8 @@
 import java.security.ProtectionDomain;
 import java.security.SecureClassLoader;
 import jdk.internal.dynalink.beans.StaticClass;
+import jdk.nashorn.internal.runtime.Context;
+import jdk.nashorn.internal.runtime.ScriptFunction;
 
 /**
  * This class encapsulates the bytecode of the adapter class and can be used to load it into the JVM as an actual Class.
@@ -85,13 +87,14 @@
             @Override
             public Class<?> loadClass(final String name, final boolean resolve) throws ClassNotFoundException {
                 try {
+                    Context.checkPackageAccess(name);
                     return super.loadClass(name, resolve);
                 } catch (final SecurityException se) {
                     // we may be implementing an interface or extending a class that was
                     // loaded by a loader that prevents package.access. If so, it'd throw
                     // SecurityException for nashorn's classes!. For adapter's to work, we
-                    // should be able to refer to nashorn classes.
-                    if (name.startsWith("jdk.nashorn.internal.")) {
+                    // should be able to refer to the few classes it needs in its implementation.
+                    if(ScriptFunction.class.getName().equals(name) || JavaAdapterServices.class.getName().equals(name)) {
                         return myLoader.loadClass(name);
                     }
                     throw se;

--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterFactory.java	Wed Jul 05 19:38:35 2017 +0200
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterFactory.java	Fri Apr 25 14:20:07 2014 +0200
@@ -247,7 +247,7 @@
     }
 
     private static class AdapterInfo {
-        private static final ClassAndLoader SCRIPT_OBJECT_LOADER = new ClassAndLoader(ScriptObject.class, true);
+        private static final ClassAndLoader SCRIPT_OBJECT_LOADER = new ClassAndLoader(ScriptFunction.class, true);
 
         private final ClassLoader commonLoader;
         // TODO: soft reference the JavaAdapterClassLoader objects. They can be recreated when needed.

--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterServices.java	Wed Jul 05 19:38:35 2017 +0200
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterServices.java	Fri Apr 25 14:20:07 2014 +0200
@@ -116,8 +116,8 @@
      * static initializers.
      * @return the thread-local JS object used to define methods for the class being initialized.
      */
-    public static ScriptObject getClassOverrides() {
-        final ScriptObject overrides = classOverrides.get();
+    public static Object getClassOverrides() {
+        final Object overrides = classOverrides.get();
         assert overrides != null;
         return overrides;
     }
@@ -134,6 +134,22 @@
         NO_PERMISSIONS_INVOKER.invokeExact(method, arg);
     }
 
+    /**
+     * Set the current global scope
+     * @param global the global scope
+     */
+    public static void setGlobal(final Object global) {
+        Context.setGlobal((ScriptObject)global);
+    }
+
+    /**
+     * Get the current global scope
+     * @return the current global scope
+     */
+    public static Object getGlobal() {
+        return Context.getGlobal();
+    }
+
     static void setClassOverrides(ScriptObject overrides) {
         classOverrides.set(overrides);
     }