Fix test setup for Single Query Loading.

The construction of the DataAccessStrategy happened before the MappingContext was properly setup.
This is now fixed.
A test utilizes Single Query Loading, if it activates the profile singleQueryLoading

Closes #1606

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

@@ -19,6 +19,7 @@ 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.*;
 import static org.springframework.test.context.TestExecutionListeners.MergeMode.*;
 
@@ -36,7 +37,6 @@ import java.util.function.Function;
 import java.util.stream.IntStream;
 
 import org.assertj.core.api.SoftAssertions;
-import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -67,6 +67,7 @@ import org.springframework.data.relational.core.mapping.MappedCollection;
 import org.springframework.data.relational.core.mapping.RelationalMappingContext;
 import org.springframework.data.relational.core.mapping.Table;
 import org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations;
+import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.TestExecutionListeners;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
@@ -99,13 +100,6 @@ abstract class AbstractJdbcAggregateTemplateIntegrationTests {
 
 	LegoSet legoSet = createLegoSet("Star Destroyer");
 
-	@BeforeEach
-	void beforeEach(){
-		mappingContext.setSingleQueryLoadingEnabled(useSingleQuery());
-	}
-
-	abstract boolean useSingleQuery();
-
 	/**
 	 * creates an instance of {@link NoIdListChain4} with the following properties:
 	 * <ul>
@@ -1879,16 +1873,10 @@ abstract class AbstractJdbcAggregateTemplateIntegrationTests {
 		}
 	}
 
-	static class JdbcAggregateTemplateIntegrationTests extends AbstractJdbcAggregateTemplateIntegrationTests {
-		@Override
-		boolean useSingleQuery() {
-			return false;
-		}
-	}
-	static class JdbcAggregateTemplateSqlIntegrationTests extends AbstractJdbcAggregateTemplateIntegrationTests {
-		@Override
-		boolean useSingleQuery() {
-			return true;
-		}
+	static class JdbcAggregateTemplateIntegrationTests extends AbstractJdbcAggregateTemplateIntegrationTests {	}
+
+	@ActiveProfiles(PROFILE_SINGLE_QUERY_LOADING)
+	static class JdbcAggregateTemplateSingleQueryLoadingIntegrationTests extends AbstractJdbcAggregateTemplateIntegrationTests {
+
 	}
 }

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/HsqlDataSourceConfiguration.java

@@ -31,7 +31,7 @@ import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
  * @author Oliver Gierke
  */
 @Configuration
-@Profile({ "hsql", "default" })
+@Profile({ "hsql", "!h2 && !mysql && !mariadb && !postgres && !oracle && !db2 && !mssql" })
 class HsqlDataSourceConfiguration {
 
 	@Autowired Class<?> context;

spring-data-jdbc/src/test/java/org/springframework/data/jdbc/testing/TestConfiguration.java

@@ -31,6 +31,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Lazy;
+import org.springframework.context.annotation.Profile;
 import org.springframework.data.convert.CustomConversions;
 import org.springframework.data.jdbc.core.convert.*;
 import org.springframework.data.jdbc.core.dialect.JdbcDialect;
@@ -67,6 +68,9 @@ import org.springframework.transaction.PlatformTransactionManager;
 @ComponentScan // To pick up configuration classes (per activated profile)
 public class TestConfiguration {
 
+	public static final String PROFILE_SINGLE_QUERY_LOADING = "singleQueryLoading";
+	public static final String PROFILE_NO_SINGLE_QUERY_LOADING = "!" + PROFILE_SINGLE_QUERY_LOADING;
+
 	@Autowired DataSource dataSource;
 	@Autowired BeanFactory beanFactory;
 	@Autowired ApplicationEventPublisher publisher;
@@ -107,13 +111,23 @@ public class TestConfiguration {
 				new InsertStrategyFactory(template, new BatchJdbcOperations(template.getJdbcOperations()), dialect)).create();
 	}
 
-	@Bean
-	JdbcMappingContext jdbcMappingContext(Optional<NamingStrategy> namingStrategy, CustomConversions conversions) {
+	@Bean("jdbcMappingContext")
+	@Profile(PROFILE_NO_SINGLE_QUERY_LOADING)
+	JdbcMappingContext jdbcMappingContextWithOutSingleQueryLoading(Optional<NamingStrategy> namingStrategy, CustomConversions conversions) {
 
 		JdbcMappingContext mappingContext = new JdbcMappingContext(namingStrategy.orElse(DefaultNamingStrategy.INSTANCE));
 		mappingContext.setSimpleTypeHolder(conversions.getSimpleTypeHolder());
 		return mappingContext;
 	}
+	@Bean("jdbcMappingContext")
+	@Profile(PROFILE_SINGLE_QUERY_LOADING)
+	JdbcMappingContext jdbcMappingContextWithSingleQueryLoading(Optional<NamingStrategy> namingStrategy, CustomConversions conversions) {
+
+		JdbcMappingContext mappingContext = new JdbcMappingContext(namingStrategy.orElse(DefaultNamingStrategy.INSTANCE));
+		mappingContext.setSimpleTypeHolder(conversions.getSimpleTypeHolder());
+		mappingContext.setSingleQueryLoadingEnabled(true);
+		return mappingContext;
+	}
 
 	@Bean
 	CustomConversions jdbcCustomConversions(Dialect dialect) {