Polishing.

Simplify code. Remove redundant calls.

Reformat code, remove trailing whitespaces, remove duplicate tests.

See #1802
Original pull request: #1810

spring-data-jdbc/src/main/java/org/springframework/data/jdbc/core/convert/MappingJdbcConverter.java

@@ -26,6 +26,7 @@ import java.util.function.Function;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.core.convert.ConverterNotFoundException;
 import org.springframework.core.convert.converter.Converter;
@@ -45,7 +46,6 @@ import org.springframework.data.relational.core.mapping.AggregatePath;
 import org.springframework.data.relational.core.mapping.RelationalMappingContext;
 import org.springframework.data.relational.core.mapping.RelationalPersistentEntity;
 import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
-import org.springframework.data.relational.core.sql.SqlIdentifier;
 import org.springframework.data.relational.domain.RowDocument;
 import org.springframework.data.util.TypeInformation;
 import org.springframework.lang.Nullable;
@@ -384,15 +384,14 @@ public class MappingJdbcConverter extends MappingRelationalConverter implements
 					// references and possibly keys, that form an id
 					if (idDefiningParentPath.hasIdProperty()) {
 
-						Class<?> idType = idDefiningParentPath.getRequiredIdProperty().getActualType();
+						RelationalPersistentProperty identifier = idDefiningParentPath.getRequiredIdProperty();
-						//
+						AggregatePath idPath = idDefiningParentPath.append(identifier);
-						RelationalPersistentProperty requiredIdProperty = idDefiningParentPath.getRequiredIdProperty();
+						Object value = delegate.getValue(idPath);
-						AggregatePath idPath = idDefiningParentPath.append(requiredIdProperty);
-						Object idValue = delegate.getValue(idPath);
 
-						Assert.state(idValue != null, "idValue must not be null at this point");
+						Assert.state(value != null, "Identifier value must not be null at this point");
 
-						identifierToUse = Identifier.of(aggregatePath.getTableInfo().reverseColumnInfo().name(), idValue, idType);
+						identifierToUse = Identifier.of(aggregatePath.getTableInfo().reverseColumnInfo().name(), value,
+								identifier.getActualType());
 					}
 
 					Iterable<Object> allByPath = relationResolver.findAllByPath(identifierToUse,

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/core/AbstractJdbcAggregateTemplateIntegrationTests.java

@@ -18,6 +18,7 @@ package org.springframework.data.jdbc.core;
 import static java.util.Arrays.*;
 import static java.util.Collections.*;
 import static org.assertj.core.api.Assertions.*;
+import static org.assertj.core.api.SoftAssertions.*;
 import static org.springframework.data.jdbc.testing.TestConfiguration.*;
 import static org.springframework.data.jdbc.testing.TestDatabaseFeatures.Feature.*;
 
@@ -1294,7 +1295,7 @@ abstract class AbstractJdbcAggregateTemplateIntegrationTests {
 		First first1Reloaded = template.findById(first1.id, First.class);
 		First first2Reloaded = template.findById(first2.id, First.class);
 
-		SoftAssertions.assertSoftly(softly ->{
+		assertSoftly(softly -> {
 			softly.assertThat(first1Reloaded).isEqualTo(first1);
 			softly.assertThat(first2Reloaded).isEqualTo(first2);
 		});

spring-data-relational/src/test/java/org/springframework/data/relational/core/mapping/DefaultAggregatePathUnitTests.java

@@ -202,7 +202,6 @@ class DefaultAggregatePathUnitTests {
 			softly.assertThat(path("second2.third").isEmbedded()).isFalse();
 			softly.assertThat(path("second2.third2").isEmbedded()).isTrue();
 			softly.assertThat(path("second2").isEmbedded()).isTrue();
-
 		});
 	}
 
@@ -467,20 +466,6 @@ class DefaultAggregatePathUnitTests {
 		});
 	}
 
-	@Test // GH-1802
-	void dingens() {
-
-		assertSoftly(softly -> {
-
-			AggregatePath.TableInfo tableInfo = path("withId.second.third").getTableInfo();
-			AggregatePath idDefiningParentPath = path("withId.second.third").getIdDefiningParentPath();
-			AggregatePath.TableInfo parentTable = idDefiningParentPath.getTableInfo();
-			softly.assertThat(tableInfo.effectiveIdColumnName())
-					.isEqualTo(quoted("WITH_ID"));
-
-		});
-	}
-
 	@Test // GH-1525
 	void getLength() {