DATACMNS-1377 - ConvertingPropertyAccessor now properly coverts values for property paths.

Previously, ConvertingPropertyAccessor did not override PersistentPropertyAccessor.setProperty(PersistentPropertyPath, Object), so that the target value had to be of the leaf property's type. We now implement that method and convert it into that type before invoking the super method.

src/test/java/org/springframework/data/mapping/PersistentPropertyAccessorUnitTests.java

@@ -24,8 +24,10 @@ import lombok.Value;
 import lombok.experimental.Wither;
 
 import org.junit.Test;
+import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.data.mapping.context.SampleMappingContext;
 import org.springframework.data.mapping.context.SamplePersistentProperty;
+import org.springframework.data.mapping.model.ConvertingPropertyAccessor;
 
 /**
  * @author Oliver Gierke
@@ -114,6 +116,23 @@ public class PersistentPropertyAccessorUnitTests {
 		});
 	}
 
+	@Test // DATACMNS-1377
+	public void shouldConvertToPropertyPathLeafType() {
+
+		Order order = new Order(new Customer("1"));
+
+		PersistentPropertyAccessor<Order> accessor = context.getPersistentEntity(Order.class).getPropertyAccessor(order);
+		ConvertingPropertyAccessor<Order> convertingAccessor = new ConvertingPropertyAccessor<>(accessor,
+				new DefaultConversionService());
+
+		PersistentPropertyPath<SamplePersistentProperty> path = context.getPersistentPropertyPath("customer.firstname",
+				Order.class);
+
+		convertingAccessor.setProperty(path, 2);
+
+		assertThat(convertingAccessor.getBean().getCustomer().getFirstname()).isEqualTo("2");
+	}
+
 	@Value
 	static class Order {
 		Customer customer;