--- old/src/java.base/share/classes/jdk/internal/access/JavaLangAccess.java	2019-12-03 19:37:30.000000000 -0800
+++ new/src/java.base/share/classes/jdk/internal/access/JavaLangAccess.java	2019-12-03 19:37:30.000000000 -0800
@@ -26,6 +26,8 @@
 package jdk.internal.access;
 
 import java.lang.annotation.Annotation;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodType;
 import java.lang.module.ModuleDescriptor;
 import java.lang.reflect.Executable;
 import java.lang.reflect.Method;
@@ -148,6 +150,14 @@
     Class<?> defineClass(ClassLoader cl, String name, byte[] b, ProtectionDomain pd, String source);
 
     /**
+     * Defines a class with the given name to a class loader with
+     * the given flags and class data.
+     *
+     * @see java.lang.invoke.MethodHandles.Lookup#defineClass
+     */
+    Class<?> defineClass(ClassLoader cl, Class<?> lookup, String name, byte[] b, ProtectionDomain pd, boolean initialize, int flags, Object classData);
+
+    /**
      * Returns a class loaded by the bootstrap class loader.
      */
     Class<?> findBootstrapClassOrNull(ClassLoader cl, String name);
@@ -319,4 +329,14 @@
      * @param library name of the library to load
      */
     void loadLibrary(Class<?> caller, String library);
+
+    /**
+     * Get protection domain of the given Class
+     */
+    ProtectionDomain protectionDomain(Class<?> c);
+
+    /**
+     * Get a method handle of string concat helper method
+     */
+    MethodHandle stringConcatHelper(String name, MethodType methodType);
 }