1 files changed, 12 insertions, 0 deletions
diff --git a/src/main/java/net/openhft/chronicle/core/UnsafeMemory.java b/src/main/java/net/openhft/chronicle/core/UnsafeMemory.java
index ec92c74..2cb1a58 100755
--- a/src/main/java/net/openhft/chronicle/core/UnsafeMemory.java
+++ b/src/main/java/net/openhft/chronicle/core/UnsafeMemory.java
@@ -19,6 +19,9 @@ package net.openhft.chronicle.core;
 import net.openhft.chronicle.core.annotation.ForceInline;
 import org.jetbrains.annotations.NotNull;
 import sun.misc.Unsafe;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 
 import java.lang.reflect.Field;
 import java.util.concurrent.atomic.AtomicLong;
@@ -28,6 +31,7 @@ public class UnsafeMemory implements Memory {
 
     @NotNull
     public static final Unsafe UNSAFE;
+    public static final MethodHandle defineClassMethodHandle;
     public static final UnsafeMemory INSTANCE;
     // see java.nio.Bits.copyMemory
     // This number limits the number of bytes to copy per call to Unsafe's
@@ -43,6 +47,14 @@ public class UnsafeMemory implements Memory {
         } catch (@NotNull NoSuchFieldException | IllegalAccessException | IllegalArgumentException e) {
             throw new AssertionError(e);
         }
+        try {
+            MethodHandles.Lookup baseLookup = MethodHandles.lookup();
+            MethodType defineClassMethodType = MethodType.methodType(Class.class, new Class[]{String.class, byte[].class, int.class, int.class});
+            MethodHandles.Lookup lookup = MethodHandles.privateLookupIn(ClassLoader.class, baseLookup);
+            defineClassMethodHandle = lookup.findVirtual(ClassLoader.class, "defineClass", defineClassMethodType);
+        } catch (Throwable e) {
+            throw new RuntimeException(e);
+        }
         INSTANCE = Jvm.isArm() ? new ARMMemory() : new UnsafeMemory();
     }