ObjectToObjectConverter properly handles constructors on non-public classes

Issue: SPR-14304

spring-core/src/main/java/org/springframework/core/convert/support/ObjectToObjectConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -70,6 +70,7 @@ final class ObjectToObjectConverter implements ConditionalGenericConverter {
 			else {
 				Constructor<?> constructor = getConstructor(targetClass, sourceClass);
 				if (constructor != null) {
+					ReflectionUtils.makeAccessible(constructor);
 					return constructor.newInstance(source);
 				}
 			}