ObjectToObjectConverter properly handles constructors on non-public classes

Issue: SPR-14304
(cherry picked from commit 9659bc5)

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

@@ -102,6 +102,7 @@ final class ObjectToObjectConverter implements ConditionalGenericConverter {
 			}
 			else if (member instanceof Constructor) {
 				Constructor<?> ctor = (Constructor<?>) member;
+				ReflectionUtils.makeAccessible(ctor);
 				return ctor.newInstance(source);
 			}
 		}

spring-core/src/test/java/org/springframework/core/convert/converter/DefaultConversionServiceTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.core.convert.support;
+package org.springframework.core.convert.converter;
 
 import java.awt.Color;
 import java.lang.reflect.Method;
@@ -49,8 +49,7 @@ import org.springframework.core.MethodParameter;
 import org.springframework.core.convert.ConversionFailedException;
 import org.springframework.core.convert.ConverterNotFoundException;
 import org.springframework.core.convert.TypeDescriptor;
-import org.springframework.core.convert.converter.Converter;
+import org.springframework.core.convert.support.DefaultConversionService;
-import org.springframework.core.convert.converter.ConverterRegistry;
 import org.springframework.tests.Assume;
 import org.springframework.tests.TestGroup;
 import org.springframework.util.ClassUtils;
@@ -60,16 +59,16 @@ import static org.hamcrest.Matchers.*;
 import static org.junit.Assert.*;
 
 /**
- * Unit tests for the {@link DefaultConversionService}.
+ * Unit tests for {@link DefaultConversionService}.
  *
- * <p>For tests involving the {@link GenericConversionService}, see
+ * <p>In this package for enforcing accessibility checks to non-public classes outside
- * {@link GenericConversionServiceTests}.
+ * of the {@code org.springframework.core.convert.support} implementation package.
+ * Only in such a scenario, {@code setAccessible(true)} is actually necessary.
  *
  * @author Keith Donald
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @author Sam Brannen
- * @see GenericConversionServiceTests
  */
 public class DefaultConversionServiceTests {
 
@@ -243,22 +242,22 @@ public class DefaultConversionServiceTests {
 	public void testEnumToString() {
 		assertEquals("BAR", conversionService.convert(Foo.BAR, String.class));
 	}
-	
+
 	@Test
 	public void testIntegerToEnum() throws Exception {
 		assertEquals(Foo.BAR, conversionService.convert(0, Foo.class));
 	}
-	
+
 	@Test
 	public void testIntegerToEnumWithSubclass() throws Exception {
 		assertEquals(SubFoo.BAZ, conversionService.convert(1, SubFoo.BAR.getClass()));
 	}
-	
+
 	@Test
 	public void testIntegerToEnumNull() {
 		assertEquals(null, conversionService.convert(null, Foo.class));
 	}
-	
+
 	@Test
 	public void testEnumToInteger() {
 		assertEquals(Integer.valueOf(0), conversionService.convert(Foo.BAR, Integer.class));

spring-core/src/test/java/org/springframework/core/convert/support/GenericConversionServiceTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 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.
@@ -54,17 +54,15 @@ import static org.hamcrest.Matchers.*;
 import static org.junit.Assert.*;
 
 /**
- * Unit tests for the {@link GenericConversionService}.
+ * Unit tests for {@link GenericConversionService}.
  *
- * <p>For tests involving the {@link DefaultConversionService}, see
+ * <p>In this package for access to package-local converter implementations.
- * {@link DefaultConversionServiceTests}.
  *
  * @author Keith Donald
  * @author Juergen Hoeller
  * @author Phillip Webb
  * @author David Haraburda
  * @author Sam Brannen
- * @see DefaultConversionServiceTests
  */
 public class GenericConversionServiceTests {