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

*** 2399,2409 ****
                  if (!getField.getDeclaringClass().isAssignableFrom(lookupClass())) {
                      throw getField.makeAccessException("caller class must be a subclass below the method", lookupClass());
                  }
                  refc = lookupClass();
              }
!             return VarHandles.makeFieldHandle(getField, refc, getField.getFieldType(), this.allowedModes == TRUSTED);
          }
          /** Check access and get the requested constructor. */
          private MethodHandle getDirectConstructor(Class<?> refc, MemberName ctor) throws IllegalAccessException {
              final boolean checkSecurity = true;
              return getDirectConstructorCommon(refc, ctor, checkSecurity);
--- 2399,2411 ----
                  if (!getField.getDeclaringClass().isAssignableFrom(lookupClass())) {
                      throw getField.makeAccessException("caller class must be a subclass below the method", lookupClass());
                  }
                  refc = lookupClass();
              }
!             // don't allow writing on value type
!             boolean isWriteAllowedOnFinalFields = this.allowedModes == TRUSTED && !putField.isValue();
!             return VarHandles.makeFieldHandle(getField, refc, getField.getFieldType(), isWriteAllowedOnFinalFields);
          }
          /** Check access and get the requested constructor. */
          private MethodHandle getDirectConstructor(Class<?> refc, MemberName ctor) throws IllegalAccessException {
              final boolean checkSecurity = true;
              return getDirectConstructorCommon(refc, ctor, checkSecurity);