src/java.base/share/classes/java/lang/invoke/VarHandle.java

*** 1542,1551 ****
--- 1542,1556 ----
  
          MethodType accessModeType(Class<?> receiver, Class<?> value,
                                    Class<?>... intermediate) {
              Class<?>[] ps;
              int i;
+             // the field type (value) is mapped to the return type of MethodType
+             // the receiver type is mapped to a parameter type of MethodType
+             // So use the value type as receiver may be a box type.
+             if (receiver != null && receiver.isValue())
+                 receiver = receiver.asValueType();
              switch (this) {
                  case GET:
                      ps = allocateParameters(0, receiver, intermediate);
                      fillParameters(ps, receiver, intermediate);
                      return MethodType.methodType(value, ps);