Change preference of session store implementations

The order has been determined based on usage statistics.

Closes gh-27756

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/session/SessionAutoConfiguration.java

@@ -116,8 +116,8 @@ public class SessionAutoConfiguration {
 
 		@Configuration(proxyBeanMethods = false)
 		@ConditionalOnMissingBean(SessionRepository.class)
-		@Import({ RedisSessionConfiguration.class, MongoSessionConfiguration.class, HazelcastSessionConfiguration.class,
-				JdbcSessionConfiguration.class })
+		@Import({ RedisSessionConfiguration.class, JdbcSessionConfiguration.class, HazelcastSessionConfiguration.class,
+				MongoSessionConfiguration.class })
 		static class ServletSessionRepositoryConfiguration {
 
 		}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/SessionAutoConfigurationHazelcastTests.java

@@ -58,9 +58,9 @@ class SessionAutoConfigurationHazelcastTests extends AbstractSessionAutoConfigur
 	}
 
 	@Test
-	void hazelcastTakesPrecedenceOverJdbc() {
+	void hazelcastTakesPrecedenceOverMongo() {
 		this.contextRunner.withClassLoader(
-				new FilteredClassLoader(RedisIndexedSessionRepository.class, MongoIndexedSessionRepository.class))
+				new FilteredClassLoader(RedisIndexedSessionRepository.class, JdbcIndexedSessionRepository.class))
 				.run(this::validateDefaultConfig);
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/SessionAutoConfigurationJdbcTests.java

@@ -74,6 +74,12 @@ class SessionAutoConfigurationJdbcTests extends AbstractSessionAutoConfiguration
 		this.contextRunner.run(this::validateDefaultConfig);
 	}
 
+	@Test
+	void jdbcTakesPrecedenceOverMongoAndHazelcast() {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(RedisIndexedSessionRepository.class))
+				.run(this::validateDefaultConfig);
+	}
+
 	private void validateDefaultConfig(AssertableWebApplicationContext context) {
 		JdbcIndexedSessionRepository repository = validateSessionRepository(context,
 				JdbcIndexedSessionRepository.class);

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/SessionAutoConfigurationMongoTests.java

@@ -63,12 +63,6 @@ class SessionAutoConfigurationMongoTests extends AbstractSessionAutoConfiguratio
 		this.contextRunner.run(validateSpringSessionUsesMongo("sessions"));
 	}
 
-	@Test
-	void mongoTakesPrecedenceOverJdbcAndHazelcast() {
-		this.contextRunner.withClassLoader(new FilteredClassLoader(RedisIndexedSessionRepository.class))
-				.run(validateSpringSessionUsesMongo("sessions"));
-	}
-
 	@Test
 	void defaultConfigWithCustomTimeout() {
 		this.contextRunner.withPropertyValues("spring.session.timeout=1m")