src/java.base/share/classes/jdk/internal/reflect/UnsafeQualifiedObjectFieldAccessorImpl.java

*** 34,44 ****
          super(field, isReadOnly);
      }
  
      public Object get(Object obj) throws IllegalArgumentException {
          ensureObj(obj);
!         return isFlattened ? unsafe.getValue(obj, fieldOffset, field.getType())
                             : unsafe.getObjectVolatile(obj, fieldOffset);
      }
  
      public boolean getBoolean(Object obj) throws IllegalArgumentException {
          throw newGetBooleanIllegalArgumentException();
--- 34,44 ----
          super(field, isReadOnly);
      }
  
      public Object get(Object obj) throws IllegalArgumentException {
          ensureObj(obj);
!         return isFlattened() ? unsafe.getValue(obj, fieldOffset, field.getType())
                              : unsafe.getObjectVolatile(obj, fieldOffset);
      }
  
      public boolean getBoolean(Object obj) throws IllegalArgumentException {
          throw newGetBooleanIllegalArgumentException();
*** 77,94 ****
      {
          ensureObj(obj);
          if (isReadOnly) {
              throwFinalFieldIllegalAccessException(value);
          }
!         if (value != null) {
!             if (!field.getType().isAssignableFrom(value.getClass())) {
!                 throwSetIllegalArgumentException(value);
!             }
!         } else if (field.getType().isValue()) {
!             throw new NullPointerException("cannot set this field of type " + field.getType() + " to null");
!         }
!         if (isFlattened) {
              unsafe.putValue(obj, fieldOffset, field.getType(), value);
          } else {
              unsafe.putObjectVolatile(obj, fieldOffset, value);
          }
      }
--- 77,88 ----
      {
          ensureObj(obj);
          if (isReadOnly) {
              throwFinalFieldIllegalAccessException(value);
          }
!         checkValue(value);
!         if (isFlattened()) {
              unsafe.putValue(obj, fieldOffset, field.getType(), value);
          } else {
              unsafe.putObjectVolatile(obj, fieldOffset, value);
          }
      }