--- old/src/java.base/share/classes/java/lang/System.java	2019-12-03 19:37:21.000000000 -0800
+++ new/src/java.base/share/classes/java/lang/System.java	2019-12-03 19:37:21.000000000 -0800
@@ -35,6 +35,8 @@
 import java.io.PrintStream;
 import java.io.UnsupportedEncodingException;
 import java.lang.annotation.Annotation;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodType;
 import java.lang.module.ModuleDescriptor;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Executable;
@@ -2195,6 +2197,10 @@
             public Class<?> defineClass(ClassLoader loader, String name, byte[] b, ProtectionDomain pd, String source) {
                 return ClassLoader.defineClass1(loader, name, b, 0, b.length, pd, source);
             }
+            public Class<?> defineClass(ClassLoader loader, Class<?> lookup, String name, byte[] b, ProtectionDomain pd,
+                                        boolean initialize, int flags, Object classData) {
+                return ClassLoader.defineClass0(loader, lookup, name, b, 0, b.length, pd, initialize, flags, classData);
+            }
             public Class<?> findBootstrapClassOrNull(ClassLoader cl, String name) {
                 return cl.findBootstrapClassOrNull(name);
             }
@@ -2282,6 +2288,15 @@
                 assert library.indexOf(java.io.File.separatorChar) < 0;
                 ClassLoader.loadLibrary(caller, library, false);
             }
+
+            public ProtectionDomain protectionDomain(Class<?> c) {
+                return c.protectionDomain();
+            }
+
+            public MethodHandle stringConcatHelper(String name, MethodType methodType) {
+                return StringConcatHelper.lookupStatic(name, methodType);
+            }
+
         });
     }
 }