Support conversion from primitive array to Object[] in ConversionService

Prior to this commit, the ConversionService failed to convert a primitive
array (such as int[]) to an Object[] due to an error in the logic in
ArrayToArrayConverter.

This commit addresses this by augmenting the "can bypass conversion"
check in ArrayToArrayConverter to ensure that the supplied source object
is an instance of the target type (i.e., that the source array can be
cast to the target type array without conversion).

Closes gh-33212

(cherry picked from commit cb6a5baac5)
(cherry picked from commit 3e7372491c)

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -34,6 +34,7 @@ import org.springframework.util.ObjectUtils;
  *
  * @author Keith Donald
  * @author Phillip Webb
+ * @author Sam Brannen
  * @since 3.0
  */
 final class ArrayToArrayConverter implements ConditionalGenericConverter {
@@ -64,7 +65,7 @@ final class ArrayToArrayConverter implements ConditionalGenericConverter {
 	public Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (this.conversionService instanceof GenericConversionService) {
 			TypeDescriptor targetElement = targetType.getElementTypeDescriptor();
-			if (targetElement != null &&
+			if (targetElement != null && targetType.getType().isInstance(source) &&
 					((GenericConversionService) this.conversionService).canBypassConvert(
 							sourceType.getElementTypeDescriptor(), targetElement)) {
 				return source;

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -626,9 +626,27 @@ class DefaultConversionServiceTests {
 		assertThat(result[2]).isEqualTo(3);
 	}
 
+	@Test  // gh-33212
+	void convertIntArrayToObjectArray() {
+		Object[] result = conversionService.convert(new int[] {1, 2}, Object[].class);
+		assertThat(result).containsExactly(1, 2);
+	}
+
 	@Test
-	void convertByteArrayToWrapperArray() {
-		byte[] byteArray = new byte[] {1, 2, 3};
+	void convertIntArrayToFloatArray() {
+		Float[] result = conversionService.convert(new int[] {1, 2}, Float[].class);
+		assertThat(result).containsExactly(1.0F, 2.0F);
+	}
+
+	@Test
+	void convertIntArrayToPrimitiveFloatArray() {
+		float[] result = conversionService.convert(new int[] {1, 2}, float[].class);
+		assertThat(result).containsExactly(1.0F, 2.0F);
+	}
+
+	@Test
+	void convertPrimitiveByteArrayToByteWrapperArray() {
+		byte[] byteArray = {1, 2, 3};
 		Byte[] converted = conversionService.convert(byteArray, Byte[].class);
 		assertThat(converted).isEqualTo(new Byte[]{1, 2, 3});
 	}