Move AggregateReference converter registration into MappingJdbcConverter.

See #1750
Original pull request: #1785

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

@@ -39,18 +39,8 @@ import org.springframework.data.jdbc.core.mapping.JdbcSimpleTypes;
  */
 public class JdbcCustomConversions extends CustomConversions {
 
-	private static final Collection<Object> STORE_CONVERTERS;
+	private static final Collection<Object> STORE_CONVERTERS = Collections
-
+			.unmodifiableCollection(Jsr310TimestampBasedConverters.getConvertersToRegister());
-	static {
-
-		List<Object> converters = new ArrayList<>(Jsr310TimestampBasedConverters.getConvertersToRegister());
-
-		converters
-				.addAll(AggregateReferenceConverters.getConvertersToRegister(DefaultConversionService.getSharedInstance()));
-
-		STORE_CONVERTERS = Collections.unmodifiableCollection(converters);
-
-	}
 
 	/**
 	 * Creates an empty {@link JdbcCustomConversions} object.
@@ -66,7 +56,6 @@ public class JdbcCustomConversions extends CustomConversions {
 	 * @param converters must not be {@literal null}.
 	 */
 	public JdbcCustomConversions(List<?> converters) {
-
 		super(constructConverterConfiguration(converters));
 	}
 
@@ -98,29 +87,13 @@ public class JdbcCustomConversions extends CustomConversions {
 
 	private static ConverterConfiguration constructConverterConfiguration(List<?> converters) {
 
-		StoreConversions storeConversions = storeConversions(converters);
-
 		return new ConverterConfiguration( //
-				storeConversions, //
+				StoreConversions.of(JdbcSimpleTypes.HOLDER, STORE_CONVERTERS), //
 				converters, //
 				JdbcCustomConversions::excludeConversionsBetweenDateAndJsr310Types //
 		);
 	}
 
-	private static StoreConversions storeConversions(List<?> userConverters) {
-
-		List<Object> converters = new ArrayList<>(Jsr310TimestampBasedConverters.getConvertersToRegister());
-
-		DefaultConversionService defaultConversionService = new DefaultConversionService();
-		for (Object userConverter : userConverters) {
-			if (userConverter instanceof Converter<?, ?> converter)
-				defaultConversionService.addConverter(converter);
-		}
-
-		converters.addAll(AggregateReferenceConverters.getConvertersToRegister(defaultConversionService));
-
-		return StoreConversions.of(JdbcSimpleTypes.HOLDER, Collections.unmodifiableCollection(converters));
-	}
 
 	/**
 	 * Obtain a read only copy of default store converters.

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

@@ -29,6 +29,7 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.core.convert.ConverterNotFoundException;
 import org.springframework.core.convert.converter.Converter;
+import org.springframework.core.convert.converter.ConverterRegistry;
 import org.springframework.data.convert.CustomConversions;
 import org.springframework.data.jdbc.core.mapping.AggregateReference;
 import org.springframework.data.jdbc.core.mapping.JdbcValue;
@@ -91,6 +92,8 @@ public class MappingJdbcConverter extends MappingRelationalConverter implements
 
 		this.typeFactory = JdbcTypeFactory.unsupported();
 		this.relationResolver = relationResolver;
+
+		registerAggregateReferenceConverters();
 	}
 
 	/**
@@ -110,6 +113,14 @@ public class MappingJdbcConverter extends MappingRelationalConverter implements
 
 		this.typeFactory = typeFactory;
 		this.relationResolver = relationResolver;
+
+		registerAggregateReferenceConverters();
+	}
+
+	private void registerAggregateReferenceConverters() {
+
+		ConverterRegistry registry = (ConverterRegistry) getConversionService();
+		AggregateReferenceConverters.getConvertersToRegister(getConversionService()).forEach(registry::addConverter);
 	}
 
 	@Nullable
@@ -327,7 +338,8 @@ public class MappingJdbcConverter extends MappingRelationalConverter implements
 			this.accessor = accessor;
 			this.context = context;
 			this.identifier = path.isEntity()
-					? potentiallyAppendIdentifier(identifier, path.getRequiredLeafEntity(), property -> delegate.getValue(path.append(property)))
+					? potentiallyAppendIdentifier(identifier, path.getRequiredLeafEntity(),
+							property -> delegate.getValue(path.append(property)))
 					: identifier;
 		}
 

spring-data-relational/src/main/java/org/springframework/data/relational/core/conversion/MappingRelationalConverter.java

@@ -134,7 +134,6 @@ public class MappingRelationalConverter extends AbstractRelationalConverter
 
 		this.spELContext = new SpELContext(DocumentPropertyAccessor.INSTANCE);
 		this.introspector = createIntrospector(projectionFactory, getConversions(), getMappingContext());
-
 	}
 
 	private static EntityProjectionIntrospector createIntrospector(ProjectionFactory projectionFactory,