add Kotlin examples for Spring Data Integration of servlet application

Author: talerngpong

docs/modules/ROOT/pages/servlet/integrations/data.adoc

@@ -2,22 +2,31 @@
 = Spring Data Integration
 
 Spring Security provides Spring Data integration that allows referring to the current user within your queries.
-It is not only useful but necessary to include the user in the queries to support paged results, since filtering the results afterwards would not scale.
+It is not only useful but necessary to include the user in the queries to support paged results since filtering the results afterwards would not scale.
 
 [[data-configuration]]
 == Spring Data & Spring Security Configuration
 
-To use this support, add the `org.springframework.security:spring-security-data` dependency and provide a bean of type `SecurityEvaluationContextExtension`.
-In Java configuration, this would look like:
+To use this support, add `org.springframework.security:spring-security-data` dependency and provide a bean of type `SecurityEvaluationContextExtension`:
 
 ====
-[source,java]
+.Java
+[source,java,role="primary"]
 ----
 @Bean
 public SecurityEvaluationContextExtension securityEvaluationContextExtension() {
 	return new SecurityEvaluationContextExtension();
 }
 ----
+
+.Kotlin
+[source,kotlin,role="secondary"]
+----
+@Bean
+fun securityEvaluationContextExtension(): SecurityEvaluationContextExtension {
+	return SecurityEvaluationContextExtension()
+}
+----
 ====
 
 In XML Configuration, this would look like:
@@ -35,16 +44,27 @@ In XML Configuration, this would look like:
 Now you can use Spring Security within your queries:
 
 ====
-[source,java]
+.Java
+[source,java,role="primary"]
 ----
 @Repository
 public interface MessageRepository extends PagingAndSortingRepository<Message,Long> {
 	@Query("select m from Message m where m.to.id = ?#{ principal?.id }")
 	Page<Message> findInbox(Pageable pageable);
 }
 ----
+
+.Kotlin
+[source,kotlin,role="secondary"]
+----
+@Repository
+interface MessageRepository : PagingAndSortingRepository<Message,Long> {
+	@Query("select m from Message m where m.to.id = ?#{ principal?.id }")
+	fun findInbox(pageable: Pageable): Page<Message>
+}
+----
 ====
 
 This checks to see if the `Authentication.getPrincipal().getId()` is equal to the recipient of the `Message`.
-Note that this example assumes you have customized the principal to be an `Object` that has an `id` property.
-By exposing the `SecurityEvaluationContextExtension` bean, all of the xref:servlet/authorization/expression-based.adoc#common-expressions[Common Security Expressions] are available within the query.
+Note that this example assumes you have customized the principal to be an Object that has an id property.
+By exposing the `SecurityEvaluationContextExtension` bean, all of the xref:servlet/authorization/expression-based.adoc#common-expressions[Common Security Expressions] are available within the Query.