Order SessionRepositoryCustomizer before other customizers

Update `JdbcSessionConfiguration` so the `SessionRepositoryCustomizer`
used to map properties is always applied before other customizers.

See gh-33514

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

@@ -31,6 +31,8 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.session.SessionRepository;
 import org.springframework.session.config.SessionRepositoryCustomizer;
@@ -64,6 +66,7 @@ class JdbcSessionConfiguration {
 	}
 
 	@Bean
+	@Order(Ordered.HIGHEST_PRECEDENCE)
 	SessionRepositoryCustomizer<JdbcIndexedSessionRepository> springBootSessionRepositoryCustomizer(
 			SessionProperties sessionProperties, JdbcSessionProperties jdbcSessionProperties,
 			ServerProperties serverProperties) {

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

@@ -49,6 +49,7 @@ import org.springframework.session.data.mongo.MongoIndexedSessionRepository;
 import org.springframework.session.data.redis.RedisIndexedSessionRepository;
 import org.springframework.session.hazelcast.HazelcastIndexedSessionRepository;
 import org.springframework.session.jdbc.JdbcIndexedSessionRepository;
+import org.springframework.session.jdbc.PostgreSqlJdbcIndexedSessionRepositoryCustomizer;
 import org.springframework.session.jdbc.config.annotation.SpringSessionDataSource;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -243,6 +244,24 @@ class SessionAutoConfigurationJdbcTests extends AbstractSessionAutoConfiguration
 						.hasBean("customInitializer"));
 	}
 
+	@Test
+	void whenTheUserDefinesTheirOwnJdbcIndexedSessionRepositoryCustomizerThenDefaultConfigurationIsOverwritten() {
+		String expectedCreateSessionAttributeQuery = """
+				INSERT INTO SPRING_SESSION_ATTRIBUTES (SESSION_PRIMARY_ID, ATTRIBUTE_NAME, ATTRIBUTE_BYTES)
+				VALUES (?, ?, ?)
+				ON CONFLICT (SESSION_PRIMARY_ID, ATTRIBUTE_NAME)
+				DO UPDATE SET ATTRIBUTE_BYTES = EXCLUDED.ATTRIBUTE_BYTES
+				""";
+
+		this.contextRunner.withUserConfiguration(CustomJdbcIndexedSessionRepositoryCustomizerConfiguration.class)
+				.withConfiguration(AutoConfigurations.of(JdbcSessionConfiguration.class)).run((context) -> {
+					JdbcIndexedSessionRepository repository = validateSessionRepository(context,
+							JdbcIndexedSessionRepository.class);
+					assertThat(repository).hasFieldOrPropertyWithValue("createSessionAttributeQuery",
+							expectedCreateSessionAttributeQuery);
+				});
+	}
+
 	@Configuration
 	static class SessionDataSourceConfiguration {
 
@@ -289,4 +308,14 @@ class SessionAutoConfigurationJdbcTests extends AbstractSessionAutoConfiguration
 
 	}
 
+	@Configuration
+	static class CustomJdbcIndexedSessionRepositoryCustomizerConfiguration {
+
+		@Bean
+		PostgreSqlJdbcIndexedSessionRepositoryCustomizer postgreSqlJdbcIndexedSessionRepositoryCustomizer() {
+			return new PostgreSqlJdbcIndexedSessionRepositoryCustomizer();
+		}
+
+	}
+
 }