Limit BeanWrapper's KotlinCopyUtil to Kotlin Data classes.

Previously, we tried to invoke the copy(…) method on all Kotlin classes whereas the copy(…) method is only specific to Kotlin data classes.

Original pull request: #390.
Closes #2358.

src/main/java/org/springframework/data/mapping/model/BeanWrapper.java

@@ -25,10 +25,10 @@ import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 
-import org.springframework.core.KotlinDetector;
 import org.springframework.data.mapping.MappingException;
 import org.springframework.data.mapping.PersistentProperty;
 import org.springframework.data.mapping.PersistentPropertyAccessor;
+import org.springframework.data.util.KotlinReflectionUtils;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ConcurrentReferenceHashMap;
@@ -77,7 +77,7 @@ class BeanWrapper<T> implements PersistentPropertyAccessor<T> {
 					return;
 				}
 
-				if (KotlinDetector.isKotlinType(property.getOwner().getType())) {
+				if (KotlinReflectionUtils.isDataClass(property.getOwner().getType())) {
 
 					this.bean = (T) KotlinCopyUtil.setProperty(property, bean, value);
 					return;

src/main/java/org/springframework/data/util/KotlinReflectionUtils.java

@@ -66,6 +66,22 @@ public final class KotlinReflectionUtils {
 				.anyMatch(it -> Integer.valueOf(KotlinClassHeaderKind.CLASS.id).equals(it));
 	}
 
+	/**
+	 * Return {@literal true} if the specified class is a Kotlin data class.
+	 *
+	 * @return {@literal true} if {@code type} is a Kotlin data class.
+	 * @since 2.5.1
+	 */
+	public static boolean isDataClass(Class<?> type) {
+
+		if (!KotlinDetector.isKotlinType(type)) {
+			return false;
+		}
+
+		KClass<?> kotlinClass = JvmClassMappingKt.getKotlinClass(type);
+		return kotlinClass.isData();
+	}
+
 	/**
 	 * Returns a {@link KFunction} instance corresponding to the given Java {@link Method} instance, or {@code null} if
 	 * this method cannot be represented by a Kotlin function.