Deprecate support for OkHttp

Closes gh-36632

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

@@ -181,8 +181,8 @@ Spring Boot will auto-detect which HTTP client to use with `RestClient` and `Res
 In order of preference, the following clients are supported:
 
 . Apache HttpClient
-. OkHttp
 . Jetty HttpClient
+. OkHttp (deprecated)
 . Simple JDK client (`HttpURLConnection`)
 
 If multiple clients are available on the classpath, the most preferred client will be used.

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/web/client/TestRestTemplateTests.java

@@ -38,7 +38,7 @@ import org.springframework.http.RequestEntity;
 import org.springframework.http.client.ClientHttpRequest;
 import org.springframework.http.client.ClientHttpRequestFactory;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
-import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;
+import org.springframework.http.client.JettyClientHttpRequestFactory;
 import org.springframework.http.client.SimpleClientHttpRequestFactory;
 import org.springframework.mock.env.MockEnvironment;
 import org.springframework.mock.http.client.MockClientHttpRequest;
@@ -86,15 +86,16 @@ class TestRestTemplateTests {
 
 	@Test
 	void doNotReplaceCustomRequestFactory() {
-		RestTemplateBuilder builder = new RestTemplateBuilder().requestFactory(OkHttp3ClientHttpRequestFactory.class);
+		RestTemplateBuilder builder = new RestTemplateBuilder()
+			.requestFactory(HttpComponentsClientHttpRequestFactory.class);
 		TestRestTemplate testRestTemplate = new TestRestTemplate(builder);
 		assertThat(testRestTemplate.getRestTemplate().getRequestFactory())
-			.isInstanceOf(OkHttp3ClientHttpRequestFactory.class);
+			.isInstanceOf(HttpComponentsClientHttpRequestFactory.class);
 	}
 
 	@Test
 	void useTheSameRequestFactoryClassWithBasicAuth() {
-		OkHttp3ClientHttpRequestFactory customFactory = new OkHttp3ClientHttpRequestFactory();
+		JettyClientHttpRequestFactory customFactory = new JettyClientHttpRequestFactory();
 		RestTemplateBuilder builder = new RestTemplateBuilder().requestFactory(() -> customFactory);
 		TestRestTemplate testRestTemplate = new TestRestTemplate(builder).withBasicAuth("test", "test");
 		RestTemplate restTemplate = testRestTemplate.getRestTemplate();

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/client/ClientHttpRequestFactories.java

@@ -89,24 +89,25 @@ public final class ClientHttpRequestFactories {
 	 * dependencies {@link ClassUtils#isPresent are available} is returned:
 	 * <ol>
 	 * <li>{@link HttpComponentsClientHttpRequestFactory}</li>
-	 * <li>{@link OkHttp3ClientHttpRequestFactory}</li>
 	 * <li>{@link JettyClientHttpRequestFactory}</li>
+	 * <li>{@link OkHttp3ClientHttpRequestFactory} (deprecated)</li>
 	 * <li>{@link SimpleClientHttpRequestFactory}</li>
 	 * </ol>
 	 * @param settings the settings to apply
 	 * @return a new {@link ClientHttpRequestFactory}
 	 */
+	@SuppressWarnings("removal")
 	public static ClientHttpRequestFactory get(ClientHttpRequestFactorySettings settings) {
 		Assert.notNull(settings, "Settings must not be null");
 		if (APACHE_HTTP_CLIENT_PRESENT) {
 			return HttpComponents.get(settings);
 		}
-		if (OKHTTP_CLIENT_PRESENT) {
-			return OkHttp.get(settings);
-		}
 		if (JETTY_CLIENT_PRESENT) {
 			return Jetty.get(settings);
 		}
+		if (OKHTTP_CLIENT_PRESENT) {
+			return OkHttp.get(settings);
+		}
 		return Simple.get(settings);
 	}
 
@@ -119,7 +120,7 @@ public final class ClientHttpRequestFactories {
 	 * <li>{@link HttpComponentsClientHttpRequestFactory}</li>
 	 * <li>{@link JdkClientHttpRequestFactory}</li>
 	 * <li>{@link JettyClientHttpRequestFactory}</li>
-	 * <li>{@link OkHttp3ClientHttpRequestFactory}</li>
+	 * <li>{@link OkHttp3ClientHttpRequestFactory} (deprecated)</li>
 	 * <li>{@link SimpleClientHttpRequestFactory}</li>
 	 * </ul>
 	 * A {@code requestFactoryType} of {@link ClientHttpRequestFactory} is equivalent to
@@ -129,7 +130,7 @@ public final class ClientHttpRequestFactories {
 	 * @param settings the settings to apply
 	 * @return a new {@link ClientHttpRequestFactory} instance
 	 */
-	@SuppressWarnings("unchecked")
+	@SuppressWarnings({ "unchecked", "removal" })
 	public static <T extends ClientHttpRequestFactory> T get(Class<T> requestFactoryType,
 			ClientHttpRequestFactorySettings settings) {
 		Assert.notNull(settings, "Settings must not be null");
@@ -139,9 +140,6 @@ public final class ClientHttpRequestFactories {
 		if (requestFactoryType == HttpComponentsClientHttpRequestFactory.class) {
 			return (T) HttpComponents.get(settings);
 		}
-		if (requestFactoryType == OkHttp3ClientHttpRequestFactory.class) {
-			return (T) OkHttp.get(settings);
-		}
 		if (requestFactoryType == JettyClientHttpRequestFactory.class) {
 			return (T) Jetty.get(settings);
 		}
@@ -151,6 +149,9 @@ public final class ClientHttpRequestFactories {
 		if (requestFactoryType == SimpleClientHttpRequestFactory.class) {
 			return (T) Simple.get(settings);
 		}
+		if (requestFactoryType == OkHttp3ClientHttpRequestFactory.class) {
+			return (T) OkHttp.get(settings);
+		}
 		return get(() -> createRequestFactory(requestFactoryType), settings);
 	}
 
@@ -220,6 +221,8 @@ public final class ClientHttpRequestFactories {
 	/**
 	 * Support for {@link OkHttp3ClientHttpRequestFactory}.
 	 */
+	@Deprecated(since = "3.2.0", forRemoval = true)
+	@SuppressWarnings("removal")
 	static class OkHttp {
 
 		static OkHttp3ClientHttpRequestFactory get(ClientHttpRequestFactorySettings settings) {

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/client/ClientHttpRequestFactoriesRuntimeHints.java

@@ -56,10 +56,6 @@ class ClientHttpRequestFactoriesRuntimeHints implements RuntimeHintsRegistrar {
 			typeHint.onReachableType(TypeReference.of(ClientHttpRequestFactories.APACHE_HTTP_CLIENT_CLASS));
 			registerReflectionHints(hints, HttpComponentsClientHttpRequestFactory.class);
 		});
-		hints.registerTypeIfPresent(classLoader, ClientHttpRequestFactories.OKHTTP_CLIENT_CLASS, (typeHint) -> {
-			typeHint.onReachableType(TypeReference.of(ClientHttpRequestFactories.OKHTTP_CLIENT_CLASS));
-			registerReflectionHints(hints, OkHttp3ClientHttpRequestFactory.class);
-		});
 		hints.registerTypeIfPresent(classLoader, ClientHttpRequestFactories.JETTY_CLIENT_CLASS, (typeHint) -> {
 			typeHint.onReachableType(TypeReference.of(ClientHttpRequestFactories.JETTY_CLIENT_CLASS));
 			registerReflectionHints(hints, JettyClientHttpRequestFactory.class, long.class);
@@ -68,6 +64,17 @@ class ClientHttpRequestFactoriesRuntimeHints implements RuntimeHintsRegistrar {
 			typeHint.onReachableType(HttpURLConnection.class);
 			registerReflectionHints(hints, SimpleClientHttpRequestFactory.class);
 		});
+		registerOkHttpHints(hints, classLoader);
+	}
+
+	@SuppressWarnings("removal")
+	@Deprecated(since = "3.2.0", forRemoval = true)
+	private void registerOkHttpHints(ReflectionHints hints, ClassLoader classLoader) {
+		hints.registerTypeIfPresent(classLoader, ClientHttpRequestFactories.OKHTTP_CLIENT_CLASS, (typeHint) -> {
+			typeHint.onReachableType(TypeReference.of(ClientHttpRequestFactories.OKHTTP_CLIENT_CLASS));
+			registerReflectionHints(hints, OkHttp3ClientHttpRequestFactory.class);
+		});
+
 	}
 
 	private void registerReflectionHints(ReflectionHints hints,

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/ClientHttpRequestFactoriesOkHttp3Tests.java

@@ -35,7 +35,9 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Andy Wilkinson
  */
 @ClassPathOverrides("com.squareup.okhttp3:okhttp:3.14.9")
-@ClassPathExclusions("httpclient5-*.jar")
+@ClassPathExclusions({ "httpclient5-*.jar", "jetty-client-*.jar" })
+@Deprecated(since = "3.2.0")
+@SuppressWarnings("removal")
 class ClientHttpRequestFactoriesOkHttp3Tests
 		extends AbstractClientHttpRequestFactoriesTests<OkHttp3ClientHttpRequestFactory> {
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/ClientHttpRequestFactoriesOkHttp4Tests.java

@@ -33,7 +33,9 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Andy Wilkinson
  */
-@ClassPathExclusions("httpclient5-*.jar")
+@ClassPathExclusions({ "httpclient5-*.jar", "jetty-client-*.jar" })
+@Deprecated(since = "3.2.0")
+@SuppressWarnings("removal")
 class ClientHttpRequestFactoriesOkHttp4Tests
 		extends AbstractClientHttpRequestFactoriesTests<OkHttp3ClientHttpRequestFactory> {
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/ClientHttpRequestFactoriesRuntimeHintsTests.java

@@ -63,6 +63,8 @@ class ClientHttpRequestFactoriesRuntimeHintsTests {
 	}
 
 	@Test
+	@Deprecated(since = "3.2.0")
+	@SuppressWarnings("removal")
 	void shouldRegisterOkHttpHints() {
 		RuntimeHints hints = new RuntimeHints();
 		new ClientHttpRequestFactoriesRuntimeHints().registerHints(hints, getClass().getClassLoader());

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/ClientHttpRequestFactoriesTests.java

@@ -70,6 +70,8 @@ class ClientHttpRequestFactoriesTests {
 	}
 
 	@Test
+	@Deprecated(since = "3.2.0")
+	@SuppressWarnings("removal")
 	void getOfOkHttpFactoryReturnsOkHttpFactory() {
 		ClientHttpRequestFactory requestFactory = ClientHttpRequestFactories.get(OkHttp3ClientHttpRequestFactory.class,
 				ClientHttpRequestFactorySettings.DEFAULTS);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/webservices/client/HttpWebServiceMessageSenderBuilderOkHttp3IntegrationTests.java

@@ -18,12 +18,12 @@ package org.springframework.boot.webservices.client;
 
 import java.time.Duration;
 
-import okhttp3.OkHttpClient;
+import org.eclipse.jetty.client.HttpClient;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
 import org.springframework.http.client.ClientHttpRequestFactory;
-import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;
+import org.springframework.http.client.JettyClientHttpRequestFactory;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.ws.transport.WebServiceMessageSender;
 import org.springframework.ws.transport.http.ClientHttpRequestMessageSender;
@@ -42,9 +42,9 @@ class HttpWebServiceMessageSenderBuilderOkHttp3IntegrationTests {
 	private final HttpWebServiceMessageSenderBuilder builder = new HttpWebServiceMessageSenderBuilder();
 
 	@Test
-	void buildUseOkHttp3ByDefault() {
+	void buildUseJettyClientIfHttpComponentsIsNotAvailable() {
 		WebServiceMessageSender messageSender = this.builder.build();
-		assertOkHttp3RequestFactory(messageSender);
+		assertJettyClientHttpRequestFactory(messageSender);
 	}
 
 	@Test
@@ -52,19 +52,19 @@ class HttpWebServiceMessageSenderBuilderOkHttp3IntegrationTests {
 		WebServiceMessageSender messageSender = this.builder.setConnectTimeout(Duration.ofSeconds(5))
 			.setReadTimeout(Duration.ofSeconds(2))
 			.build();
-		OkHttp3ClientHttpRequestFactory factory = assertOkHttp3RequestFactory(messageSender);
+		JettyClientHttpRequestFactory factory = assertJettyClientHttpRequestFactory(messageSender);
-		OkHttpClient client = (OkHttpClient) ReflectionTestUtils.getField(factory, "client");
+		HttpClient client = (HttpClient) ReflectionTestUtils.getField(factory, "httpClient");
 		assertThat(client).isNotNull();
-		assertThat(client.connectTimeoutMillis()).isEqualTo(5000);
+		assertThat(client.getConnectTimeout()).isEqualTo(5000);
-		assertThat(client.readTimeoutMillis()).isEqualTo(2000);
+		assertThat(factory).hasFieldOrPropertyWithValue("readTimeout", 2000L);
 	}
 
-	private OkHttp3ClientHttpRequestFactory assertOkHttp3RequestFactory(WebServiceMessageSender messageSender) {
+	private JettyClientHttpRequestFactory assertJettyClientHttpRequestFactory(WebServiceMessageSender messageSender) {
 		assertThat(messageSender).isInstanceOf(ClientHttpRequestMessageSender.class);
 		ClientHttpRequestMessageSender sender = (ClientHttpRequestMessageSender) messageSender;
 		ClientHttpRequestFactory requestFactory = sender.getRequestFactory();
-		assertThat(requestFactory).isInstanceOf(OkHttp3ClientHttpRequestFactory.class);
+		assertThat(requestFactory).isInstanceOf(JettyClientHttpRequestFactory.class);
-		return (OkHttp3ClientHttpRequestFactory) requestFactory;
+		return (JettyClientHttpRequestFactory) requestFactory;
 	}
 
 }

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-data-couchbase/build.gradle

@@ -13,9 +13,9 @@ dependencies {
 	testImplementation(project(":spring-boot-project:spring-boot-starters:spring-boot-starter-test"))
 	testImplementation(project(":spring-boot-project:spring-boot-tools:spring-boot-test-support"))
 	testImplementation(project(":spring-boot-project:spring-boot-testcontainers"))
-	testImplementation("com.squareup.okhttp3:okhttp")
 	testImplementation("io.projectreactor:reactor-core")
 	testImplementation("io.projectreactor:reactor-test")
+	testImplementation("org.apache.httpcomponents.client5:httpclient5")
 	testImplementation("org.junit.jupiter:junit-jupiter")
 	testImplementation("org.junit.platform:junit-platform-engine")
 	testImplementation("org.junit.platform:junit-platform-launcher")

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-data-couchbase/src/test/java/smoketest/data/couchbase/SecureCouchbaseContainer.java

@@ -17,13 +17,14 @@
 package smoketest.data.couchbase;
 
 import java.time.Duration;
+import java.util.Base64;
 
 import com.github.dockerjava.api.command.InspectContainerResponse;
-import okhttp3.Credentials;
+import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
-import okhttp3.OkHttpClient;
+import org.apache.hc.client5.http.impl.classic.HttpClients;
-import okhttp3.Request;
+import org.apache.hc.core5.http.ClassicHttpRequest;
-import okhttp3.RequestBody;
+import org.apache.hc.core5.http.HttpResponse;
-import okhttp3.Response;
+import org.apache.hc.core5.http.io.support.ClassicRequestBuilder;
 import org.testcontainers.couchbase.CouchbaseContainer;
 import org.testcontainers.utility.MountableFile;
 
@@ -33,6 +34,7 @@ import org.springframework.boot.testsupport.testcontainers.DockerImageNames;
  * A {@link CouchbaseContainer} for Couchbase with SSL configuration.
  *
  * @author Scott Frederick
+ * @author Stephane Nicoll
  */
 public class SecureCouchbaseContainer extends CouchbaseContainer {
 
@@ -69,20 +71,26 @@ public class SecureCouchbaseContainer extends CouchbaseContainer {
 	}
 
 	private void doHttpRequest(String path) {
-		Response response;
+		HttpResponse response = post(path);
-		try {
+		if (response.getCode() != 200) {
+			throw new IllegalStateException("Error calling Couchbase HTTP endpoint: " + response);
+		}
+	}
+
+	private HttpResponse post(String path) {
+		try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
+			String basicAuth = "Basic "
+					+ Base64.getEncoder().encodeToString("%s:%s".formatted(ADMIN_USER, ADMIN_PASSWORD).getBytes());
 			String url = "http://%s:%d/%s".formatted(getHost(), getMappedPort(MANAGEMENT_PORT), path);
-			Request.Builder requestBuilder = new Request.Builder().url(url)
+			ClassicHttpRequest httpPost = ClassicRequestBuilder.post(url)
-				.header("Authorization", Credentials.basic(ADMIN_USER, ADMIN_PASSWORD))
+				.addHeader("Authorization", basicAuth)
-				.post(RequestBody.create("".getBytes()));
+				.setEntity("")
-			response = new OkHttpClient().newCall(requestBuilder.build()).execute();
+				.build();
+			return httpclient.execute(httpPost, (response) -> response);
 		}
 		catch (Exception ex) {
 			throw new IllegalStateException("Error calling Couchbase HTTP endpoint", ex);
 		}
-		if (!response.isSuccessful()) {
-			throw new IllegalStateException("Error calling Couchbase HTTP endpoint: " + response);
-		}
 	}
 
 }