Add Kotlin samples and polish SSL bundle documentation

Closes gh-35105

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/ssl.adoc

@@ -84,14 +84,22 @@ See {spring-boot-autoconfigure-module-code}/ssl/PemSslBundleProperties.java[PemS
 [[features.ssl.applying]]
 === Applying SSL Bundles
 Once configured using properties, SSL bundles can be referred to by name in configuration properties for various types of connections that are auto-configured by Spring Boot.
-See the sections on <<howto#howto.webserver.configure-ssl,embedded web servers>> and <<data#data,data technologies>> for further information.
+See the sections on <<howto#howto.webserver.configure-ssl,embedded web servers>>, <<data#data,data technologies>>, and <<io#io.rest-client,REST clients>> for further information.
 
 
 
 [[features.ssl.bundles]]
 === Using SSL Bundles
 Spring Boot auto-configures a bean of type `SslBundles` that provides access to each of the named bundles configured using the `spring.ssl.bundle` properties.
-An `SslBundle` can be retrieved from the auto-configured `SslBundles` bean and used to create a `javax.net.ssl.SSLContext` or objects of other types from the `java.net.ssl` package that are typically used to configure SSL connectivity in other APIs.
+
+An `SslBundle` can be retrieved from the auto-configured `SslBundles` bean and used to create objects that are used to configure SSL connectivity in client libraries.
+The `SslBundle` provides a layered approach of obtaining these SSL objects:
+
+- `getStores()` provides access to the key store and trust store `java.security.KeyStore` instances as well as any required key store password.
+- `getManagers()` provides access to the `java.net.ssl.KeyManagerFactory` and `java.net.ssl.TrustManagerFactory` instances as well as the `java.net.ssl.KeyManager` and `java.net.ssl.TrustManager` arrays that they create.
+- `createSslContext()` provides a convenient way to obtain a new `java.net.ssl.SSLContext` instance.
+
+In addition, the `SslBundle` provides details about the key being used, the protocol to use and any option that should be applied to the SSL engine.
 
 The following example shows retrieving an `SslBundle` and using it to create an `SSLContext`:
 

spring-boot-project/spring-boot-docs/src/docs/asciidoc/io/rest-client.adoc

@@ -15,7 +15,6 @@ include::code:MyService[]
 
 `RestTemplateBuilder` includes a number of useful methods that can be used to quickly configure a `RestTemplate`.
 For example, to add BASIC authentication support, you can use `builder.basicAuthentication("user", "password").build()`.
-To add SSL support using an <<features#features.ssl.bundles,SSL bundle>>, you can use `builder.setSslBundle(sslBundle).build()`.
 
 
 
@@ -45,6 +44,14 @@ In addition to replacing the auto-configured builder, this also prevents any `Re
 
 
 
+[[io.rest-client.resttemplate.ssl]]
+==== RestTemplate SSL Support
+If you need custom SSL configuration on the `RestTemplate`, you can apply an <<features#features.ssl.bundles,SSL bundle>> to the `RestTemplateBuilder` as shown in this example:
+
+include::code:MyService[]
+
+
+
 [[io.rest-client.webclient]]
 === WebClient
 If you have Spring WebFlux on your classpath, you can also choose to use `WebClient` to call remote REST services.

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/resttemplate/Details.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,6 @@
 
 package org.springframework.boot.docs.io.restclient.resttemplate;
 
-class Details {
+public class Details {
 
 }

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/resttemplate/ssl/MyService.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.resttemplate.ssl;
+
+import org.springframework.boot.docs.io.restclient.resttemplate.Details;
+import org.springframework.boot.ssl.SslBundles;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class MyService {
+
+	private final RestTemplate restTemplate;
+
+	public MyService(RestTemplateBuilder restTemplateBuilder, SslBundles sslBundles) {
+		this.restTemplate = restTemplateBuilder.setSslBundle(sslBundles.getBundle("mybundle")).build();
+	}
+
+	public Details someRestCall(String name) {
+		return this.restTemplate.getForObject("/{name}/details", Details.class, name);
+	}
+
+}

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/webclient/Details.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.webclient;
+
+public class Details {
+
+}

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/webclient/MyService.java

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.docs.io.restclient.webclient;
 
-import org.neo4j.cypherdsl.core.Relationship.Details;
 import reactor.core.publisher.Mono;
 
 import org.springframework.stereotype.Service;

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/restclient/webclient/ssl/MyService.java

@@ -16,10 +16,10 @@
 
 package org.springframework.boot.docs.io.restclient.webclient.ssl;
 
-import org.neo4j.cypherdsl.core.Relationship.Details;
 import reactor.core.publisher.Mono;
 
 import org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientSsl;
+import org.springframework.boot.docs.io.restclient.webclient.Details;
 import org.springframework.stereotype.Service;
 import org.springframework.web.reactive.function.client.WebClient;
 

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/features/ssl/bundles/MyComponent.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.boot.docs.features.ssl.bundles
+
+import org.springframework.boot.ssl.SslBundles
+import org.springframework.stereotype.Component
+
+@Component
+@Suppress("UNUSED_VARIABLE")
+class MyComponent(sslBundles: SslBundles) {
+
+    init {
+        val sslBundle = sslBundles.getBundle("mybundle")
+        val sslContext = sslBundle.createSslContext()
+        // do something with the created sslContext
+    }
+
+}

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/resttemplate/MyService.kt

@@ -20,7 +20,6 @@ import org.springframework.boot.web.client.RestTemplateBuilder
 import org.springframework.stereotype.Service
 import org.springframework.web.client.RestTemplate
 
-@Suppress("UNUSED_PARAMETER")
 @Service
 class MyService(restTemplateBuilder: RestTemplateBuilder) {
 
@@ -31,10 +30,7 @@ class MyService(restTemplateBuilder: RestTemplateBuilder) {
 	}
 
 	fun someRestCall(name: String): Details {
-		return restTemplate.getForObject(
+		return restTemplate.getForObject("/{name}/details", Details::class.java, name)!!
-			"/{name}/details",
-			Details::class.java, name
-		)!!
 	}
 
 }

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/resttemplate/ssl/MyService.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.boot.docs.io.restclient.resttemplate.ssl
+
+import org.springframework.boot.docs.io.restclient.resttemplate.Details
+import org.springframework.boot.ssl.SslBundles
+import org.springframework.boot.web.client.RestTemplateBuilder
+import org.springframework.stereotype.Service
+import org.springframework.web.client.RestTemplate
+
+@Service
+class MyService(restTemplateBuilder: RestTemplateBuilder, sslBundles: SslBundles) {
+
+    private val restTemplate: RestTemplate
+
+    init {
+        restTemplate = restTemplateBuilder.setSslBundle(sslBundles.getBundle("mybundle")).build()
+    }
+
+    fun someRestCall(name: String): Details {
+        return restTemplate.getForObject("/{name}/details", Details::class.java, name)!!
+    }
+
+}

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/webclient/Details.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.io.restclient.webclient
+
+class Details

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/webclient/MyService.kt

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.docs.io.restclient.webclient
 
-import org.neo4j.cypherdsl.core.Relationship
 import org.springframework.stereotype.Service
 import org.springframework.web.reactive.function.client.WebClient
 import reactor.core.publisher.Mono
@@ -30,10 +29,8 @@ class MyService(webClientBuilder: WebClient.Builder) {
 		webClient = webClientBuilder.baseUrl("https://example.org").build()
 	}
 
-	fun someRestCall(name: String?): Mono<Relationship.Details> {
+	fun someRestCall(name: String?): Mono<Details> {
-		return webClient.get().uri("/{name}/details", name).retrieve().bodyToMono(
+		return webClient.get().uri("/{name}/details", name).retrieve().bodyToMono(Details::class.java)
-			Relationship.Details::class.java
-		)
 	}
 
 }

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/restclient/webclient/ssl/MyService.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,8 +16,8 @@
 
 package org.springframework.boot.docs.io.restclient.webclient.ssl
 
-import org.neo4j.cypherdsl.core.Relationship
 import org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientSsl
+import org.springframework.boot.docs.io.restclient.webclient.Details
 import org.springframework.stereotype.Service
 import org.springframework.web.reactive.function.client.WebClient
 import reactor.core.publisher.Mono
@@ -31,10 +31,8 @@ class MyService(webClientBuilder: WebClient.Builder, ssl: WebClientSsl) {
 		webClient = webClientBuilder.baseUrl("https://example.org").apply(ssl.fromBundle("mybundle")).build()
 	}
 
-	fun someRestCall(name: String?): Mono<Relationship.Details> {
+	fun someRestCall(name: String?): Mono<Details> {
-		return webClient.get().uri("/{name}/details", name).retrieve().bodyToMono(
+		return webClient.get().uri("/{name}/details", name).retrieve().bodyToMono(Details::class.java)
-			Relationship.Details::class.java
-		)
 	}
 
 }