DATAMONGO-1904 - Fixed handling of nested arrays on reads in MappingMongoConverter.

We now properly forward the component type information into recursive calls to MappingMongoConverter.readCollectionOrArray(…).

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/MappingMongoConverter.java

@@ -982,7 +982,7 @@ public class MappingMongoConverter extends AbstractMongoConverter implements App
 				}
 
 				if (dbObjItem instanceof List) {
-					items.add(readCollectionOrArray(ClassTypeInformation.OBJECT, (List) dbObjItem, path));
+					items.add(readCollectionOrArray(componentType, (List) dbObjItem, path));
 				} else {
 					items.add(getPotentiallyConvertedSimpleRead(dbObjItem, rawComponentType));
 				}

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/convert/MappingMongoConverterUnitTests.java

@@ -1873,6 +1873,19 @@ public class MappingMongoConverterUnitTests {
 		assertThat(result.property).isEqualTo(InterfacedEnum.INSTANCE);
 	}
 
+	@Test // DATAMONGO-1904
+	public void readsNestedArraysCorrectly() {
+
+		List<List<List<Float>>> floats = Arrays.asList(Arrays.asList(Arrays.asList(1.0f, 2.0f)));
+
+		org.bson.Document document = new org.bson.Document("nestedFloats", floats);
+
+		WithNestedLists result = converter.read(WithNestedLists.class, document);
+
+		assertThat(result.nestedFloats).hasSize(1);
+		assertThat(result.nestedFloats).isEqualTo(new float[][][] { { { 1.0f, 2.0f } } });
+	}
+
 	static class GenericType<T> {
 		T content;
 	}
@@ -2247,4 +2260,10 @@ public class MappingMongoConverterUnitTests {
 	static class DocWithInterfacedEnum {
 		SomeInterface property;
 	}
+
+	// DATAMONGO-1904
+
+	static class WithNestedLists {
+		float[][][] nestedFloats;
+	}
 }