DATACMNS-1609, DATACMNS-1461 - Handle null intermediates in setting auditing property paths.

We now catch the MappingException produced by trying to set auditing property paths containing null intermediate segments and ignore those. A less expensive (non-Exception-based) approach is going to be introduced for Moore as it requires API changes to the property path setting APIs.

Related tickets: DATACMNS-1438.

Author: odrotbohm

src/main/java/org/springframework/data/auditing/MappingAuditableBeanWrapperFactory.java

@@ -27,6 +27,7 @@
 import org.springframework.data.annotation.LastModifiedBy;
 import org.springframework.data.annotation.LastModifiedDate;
 import org.springframework.data.domain.Auditable;
+import org.springframework.data.mapping.MappingException;
 import org.springframework.data.mapping.PersistentEntity;
 import org.springframework.data.mapping.PersistentProperty;
 import org.springframework.data.mapping.PersistentPropertyAccessor;
@@ -174,10 +175,7 @@ public MappingMetadataAuditableBeanWrapper(PersistentPropertyAccessor<T> accesso
 		 */
 		@Override
 		public Object setCreatedBy(Object value) {
-
-			metadata.createdByPaths.forEach(it -> this.accessor.setProperty(it, value));
-
-			return value;
+			return setProperty(metadata.createdByPaths, value);
 		}
 
 		/*
@@ -232,7 +230,20 @@ public T getBean() {
 		private <S, P extends PersistentProperty<?>> S setProperty(
 				PersistentPropertyPaths<?, ? extends PersistentProperty<?>> paths, S value) {
 
-			paths.forEach(it -> this.accessor.setProperty(it, value));
+			paths.forEach(it -> {
+
+				try {
+
+					this.accessor.setProperty(it, value);
+
+				} catch (MappingException o_O) {
+
+					// Ignore null intermediate errors temporarily
+					if (!o_O.getMessage().contains("on null intermediate")) {
+						throw o_O;
+					}
+				}
+			});
 
 			return value;
 		}

src/test/java/org/springframework/data/auditing/MappingAuditableBeanWrapperFactoryUnitTests.java

@@ -212,6 +212,16 @@ public void writesNestedAuditingData() {
 		});
 	}
 
+	@Test // DATACMNS-1461
+	public void skipsNullIntermediatesWhenSettingProperties() {
+
+		WithEmbedded withEmbedded = new WithEmbedded();
+
+		assertThat(factory.getBeanWrapperFor(withEmbedded)).hasValueSatisfying(it -> {
+			assertThatCode(() -> it.setCreatedBy("user")).doesNotThrowAnyException();
+		});
+	}
+
 	private void assertLastModificationDate(Object source, TemporalAccessor expected) {
 
 		Sample sample = new Sample();