Merge branch '3.3.x'

Closes gh-43270

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/cassandra/CassandraHealthContributorAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -54,6 +54,7 @@ class CassandraHealthContributorAutoConfigurationTests {
 	}
 
 	@Test
+	@SuppressWarnings("resource")
 	void runWithCqlSessionAndSpringDataAbsentShouldCreateDriverIndicator() {
 		this.contextRunner.withBean(CqlSession.class, () -> mock(CqlSession.class))
 			.withClassLoader(new FilteredClassLoader("org.springframework.data"))

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/cassandra/CassandraReactiveHealthContributorAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -67,6 +67,7 @@ class CassandraReactiveHealthContributorAutoConfigurationTests {
 	}
 
 	@Test
+	@SuppressWarnings("resource")
 	void runWithCqlSessionAndSpringDataAbsentShouldCreateDriverIndicator() {
 		this.contextRunner.withBean(CqlSession.class, () -> mock(CqlSession.class))
 			.withClassLoader(new FilteredClassLoader("org.springframework.data"))

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/zipkin/ZipkinConfigurationsSenderConfigurationTests.java

@@ -198,6 +198,7 @@ class ZipkinConfigurationsSenderConfigurationTests {
 	}
 
 	@Test
+	@SuppressWarnings("resource")
 	void shouldUseCustomHttpEndpointSupplierFactoryWhenReactive() {
 		this.reactiveContextRunner.withUserConfiguration(WebClientConfiguration.class)
 			.withClassLoader(new FilteredClassLoader(URLConnectionSender.class))
@@ -207,6 +208,7 @@ class ZipkinConfigurationsSenderConfigurationTests {
 	}
 
 	@Test
+	@SuppressWarnings("resource")
 	void shouldUseCustomHttpEndpointSupplierFactoryWhenRestTemplate() {
 		this.contextRunner.withUserConfiguration(RestTemplateConfiguration.class)
 			.withClassLoader(new FilteredClassLoader(URLConnectionSender.class, WebClient.class))

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/pulsar/PulsarContainerFactoryCustomizersTests.java

@@ -102,6 +102,8 @@ class PulsarContainerFactoryCustomizersTests {
 
 	/**
 	 * Test customizer that will match all {@link PulsarListenerContainerFactory}.
+	 *
+	 * @param <T> the container factory type
 	 */
 	static class TestCustomizer<T extends PulsarContainerFactory<?, ?>> implements PulsarContainerFactoryCustomizer<T> {
 

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/AbstractDevToolsDataSourceAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -51,32 +51,35 @@ abstract class AbstractDevToolsDataSourceAutoConfigurationTests {
 
 	@Test
 	void singleManuallyConfiguredDataSourceIsNotClosed() throws Exception {
-		ConfigurableApplicationContext context = getContext(() -> createContext(SingleDataSourceConfiguration.class));
-		DataSource dataSource = context.getBean(DataSource.class);
-		Statement statement = configureDataSourceBehavior(dataSource);
-		then(statement).should(never()).execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(
+				() -> createContext(SingleDataSourceConfiguration.class))) {
+			DataSource dataSource = context.getBean(DataSource.class);
+			Statement statement = configureDataSourceBehavior(dataSource);
+			then(statement).should(never()).execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void multipleDataSourcesAreIgnored() throws Exception {
-		ConfigurableApplicationContext context = getContext(
-				() -> createContext(MultipleDataSourcesConfiguration.class));
-		Collection<DataSource> dataSources = context.getBeansOfType(DataSource.class).values();
-		for (DataSource dataSource : dataSources) {
-			Statement statement = configureDataSourceBehavior(dataSource);
-			then(statement).should(never()).execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(
+				() -> createContext(MultipleDataSourcesConfiguration.class))) {
+			Collection<DataSource> dataSources = context.getBeansOfType(DataSource.class).values();
+			for (DataSource dataSource : dataSources) {
+				Statement statement = configureDataSourceBehavior(dataSource);
+				then(statement).should(never()).execute("SHUTDOWN");
+			}
 		}
 	}
 
 	@Test
 	void emptyFactoryMethodMetadataIgnored() {
-		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
-		DataSource dataSource = mock(DataSource.class);
-		AnnotatedGenericBeanDefinition beanDefinition = new AnnotatedGenericBeanDefinition(dataSource.getClass());
-		context.registerBeanDefinition("dataSource", beanDefinition);
-		context.register(DevToolsDataSourceAutoConfiguration.class);
-		context.refresh();
-		context.close();
+		try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext()) {
+			DataSource dataSource = mock(DataSource.class);
+			AnnotatedGenericBeanDefinition beanDefinition = new AnnotatedGenericBeanDefinition(dataSource.getClass());
+			context.registerBeanDefinition("dataSource", beanDefinition);
+			context.register(DevToolsDataSourceAutoConfiguration.class);
+			context.refresh();
+		}
 	}
 
 	protected final Statement configureDataSourceBehavior(DataSource dataSource) throws SQLException {

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/DevToolsPooledDataSourceAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -61,88 +61,99 @@ class DevToolsPooledDataSourceAutoConfigurationTests extends AbstractDevToolsDat
 
 	@Test
 	void autoConfiguredInMemoryDataSourceIsShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(
-				() -> createContext(DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
-		context.close();
-		then(statement).should().execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(
+				() -> createContext(DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
+			context.close();
+			then(statement).should().execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void autoConfiguredExternalDataSourceIsNotShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(() -> createContext("org.postgresql.Driver",
-				DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
-		context.close();
-		then(statement).should(never()).execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(() -> createContext("org.postgresql.Driver",
+				DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
+			context.close();
+			then(statement).should(never()).execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void h2ServerIsNotShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(() -> createContext("org.h2.Driver",
-				"jdbc:h2:hsql://localhost", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
-		context.close();
-		then(statement).should(never()).execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(() -> createContext("org.h2.Driver",
+				"jdbc:h2:hsql://localhost", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
+			context.close();
+			then(statement).should(never()).execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void inMemoryH2IsShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(() -> createContext("org.h2.Driver", "jdbc:h2:mem:test",
-				DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
-		context.close();
-		then(statement).should().execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(() -> createContext("org.h2.Driver",
+				"jdbc:h2:mem:test", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
+			context.close();
+			then(statement).should().execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void hsqlServerIsNotShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(() -> createContext("org.hsqldb.jdbcDriver",
-				"jdbc:hsqldb:hsql://localhost", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
-		context.close();
-		then(statement).should(never()).execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(() -> createContext("org.hsqldb.jdbcDriver",
+				"jdbc:hsqldb:hsql://localhost", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
+			context.close();
+			then(statement).should(never()).execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void inMemoryHsqlIsShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(() -> createContext("org.hsqldb.jdbcDriver",
-				"jdbc:hsqldb:mem:test", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
-		context.close();
-		then(statement).should().execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(() -> createContext("org.hsqldb.jdbcDriver",
+				"jdbc:hsqldb:mem:test", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
+			context.close();
+			then(statement).should().execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void derbyClientIsNotShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(() -> createContext("org.apache.derby.jdbc.ClientDriver",
-				"jdbc:derby://localhost", DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
-		context.close();
-		then(statement).should(never()).execute("SHUTDOWN");
+		try (ConfigurableApplicationContext context = getContext(
+				() -> createContext("org.apache.derby.jdbc.ClientDriver", "jdbc:derby://localhost",
+						DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			Statement statement = configureDataSourceBehavior(context.getBean(DataSource.class));
+			context.close();
+			then(statement).should(never()).execute("SHUTDOWN");
+		}
 	}
 
 	@Test
 	void inMemoryDerbyIsShutdown() throws Exception {
-		ConfigurableApplicationContext context = getContext(
+		try (ConfigurableApplicationContext context = getContext(
 				() -> createContext("org.apache.derby.jdbc.EmbeddedDriver", "jdbc:derby:memory:test;create=true",
-						DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class));
-		HikariDataSource dataSource = context.getBean(HikariDataSource.class);
-		JdbcTemplate jdbc = new JdbcTemplate(dataSource);
-		jdbc.execute("SELECT 1 FROM SYSIBM.SYSDUMMY1");
-		HikariPoolMXBean pool = dataSource.getHikariPoolMXBean();
-		// Prevent a race between Hikari's initialization and Derby shutdown
-		Awaitility.await()
-			.atMost(Duration.ofSeconds(30))
-			.until(pool::getIdleConnections, (idle) -> idle == dataSource.getMinimumIdle());
-		context.close();
-		// Connect should fail as DB no longer exists
-		assertThatExceptionOfType(SQLException.class)
-			.isThrownBy(() -> new EmbeddedDriver().connect("jdbc:derby:memory:test", new Properties()))
-			.satisfies((ex) -> assertThat(ex.getSQLState()).isEqualTo("XJ004"));
-		// Shut Derby down fully so that it closes its log file
-		assertThatExceptionOfType(SQLException.class)
-			.isThrownBy(() -> new EmbeddedDriver().connect("jdbc:derby:;shutdown=true", new Properties()));
+						DataSourceAutoConfiguration.class, DataSourceSpyConfiguration.class))) {
+			HikariDataSource dataSource = context.getBean(HikariDataSource.class);
+			JdbcTemplate jdbc = new JdbcTemplate(dataSource);
+			jdbc.execute("SELECT 1 FROM SYSIBM.SYSDUMMY1");
+			HikariPoolMXBean pool = dataSource.getHikariPoolMXBean();
+			// Prevent a race between Hikari's initialization and Derby shutdown
+			Awaitility.await()
+				.atMost(Duration.ofSeconds(30))
+				.until(pool::getIdleConnections, (idle) -> idle == dataSource.getMinimumIdle());
+			context.close();
+			// Connect should fail as DB no longer exists
+			assertThatExceptionOfType(SQLException.class).isThrownBy(() -> connect("jdbc:derby:memory:test"))
+				.satisfies((ex) -> assertThat(ex.getSQLState()).isEqualTo("XJ004"));
+			// Shut Derby down fully so that it closes its log file
+			assertThatExceptionOfType(SQLException.class).isThrownBy(() -> connect("jdbc:derby:;shutdown=true"));
+		}
+	}
+
+	private void connect(String jdbcUrl) throws SQLException {
+		new EmbeddedDriver().connect(jdbcUrl, new Properties()).close();
 	}
 
 }

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/DevToolsR2dbcAutoConfigurationTests.java

@@ -71,28 +71,32 @@ class DevToolsR2dbcAutoConfigurationTests {
 
 		@Test
 		void nonEmbeddedConnectionFactoryIsNotShutdown() throws Exception {
-			ConfigurableApplicationContext context = getContext(() -> createContext("r2dbc:h2:file:///testdb"));
-			ConnectionFactory connectionFactory = context.getBean(ConnectionFactory.class);
-			context.close();
-			assertThat(shutdowns).doesNotContain(connectionFactory);
+			try (ConfigurableApplicationContext context = getContext(() -> createContext("r2dbc:h2:file:///testdb"))) {
+				ConnectionFactory connectionFactory = context.getBean(ConnectionFactory.class);
+				context.close();
+				assertThat(shutdowns).doesNotContain(connectionFactory);
+			}
 		}
 
 		@Test
 		void singleManuallyConfiguredConnectionFactoryIsNotClosed() throws Exception {
-			ConfigurableApplicationContext context = getContext(
-					() -> createContext(SingleConnectionFactoryConfiguration.class));
-			ConnectionFactory connectionFactory = context.getBean(ConnectionFactory.class);
-			context.close();
-			assertThat(shutdowns).doesNotContain(connectionFactory);
+			try (ConfigurableApplicationContext context = getContext(
+					() -> createContext(SingleConnectionFactoryConfiguration.class))) {
+				ConnectionFactory connectionFactory = context.getBean(ConnectionFactory.class);
+				context.close();
+				assertThat(shutdowns).doesNotContain(connectionFactory);
+			}
 		}
 
 		@Test
 		void multipleConnectionFactoriesAreIgnored() throws Exception {
-			ConfigurableApplicationContext context = getContext(
-					() -> createContext(MultipleConnectionFactoriesConfiguration.class));
-			Collection<ConnectionFactory> connectionFactory = context.getBeansOfType(ConnectionFactory.class).values();
-			context.close();
-			assertThat(shutdowns).doesNotContainAnyElementsOf(connectionFactory);
+			try (ConfigurableApplicationContext context = getContext(
+					() -> createContext(MultipleConnectionFactoriesConfiguration.class))) {
+				Collection<ConnectionFactory> connectionFactory = context.getBeansOfType(ConnectionFactory.class)
+					.values();
+				context.close();
+				assertThat(shutdowns).doesNotContainAnyElementsOf(connectionFactory);
+			}
 		}
 
 		@Test

spring-boot-project/spring-boot-test/src/main/java/org/springframework/boot/test/context/runner/AbstractApplicationContextRunner.java

@@ -403,7 +403,7 @@ public abstract class AbstractApplicationContextRunner<SELF extends AbstractAppl
 		}
 	}
 
-	@SuppressWarnings("unchecked")
+	@SuppressWarnings({ "unchecked", "resource" })
 	private A createAssertableContext(boolean refresh) {
 		ResolvableType resolvableType = ResolvableType.forClass(AbstractApplicationContextRunner.class, getClass());
 		Class<A> assertType = (Class<A>) resolvableType.resolveGeneric(1);

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/assertj/AssertableApplicationContextTests.java

@@ -33,6 +33,7 @@ import static org.mockito.Mockito.withSettings;
 class AssertableApplicationContextTests {
 
 	@Test
+	@SuppressWarnings("resource")
 	void getShouldReturnProxy() {
 		AssertableApplicationContext context = AssertableApplicationContext
 			.get(() -> mock(ConfigurableApplicationContext.class));
@@ -41,12 +42,13 @@ class AssertableApplicationContextTests {
 
 	@Test
 	void getWhenHasAdditionalInterfaceShouldReturnProxy() {
-		AssertableApplicationContext context = AssertableApplicationContext.get(
+		try (AssertableApplicationContext context = AssertableApplicationContext.get(
 				() -> mock(ConfigurableApplicationContext.class,
 						withSettings().extraInterfaces(AdditionalContextInterface.class)),
-				AdditionalContextInterface.class);
-		assertThat(context).isInstanceOf(ConfigurableApplicationContext.class)
-			.isInstanceOf(AdditionalContextInterface.class);
+				AdditionalContextInterface.class)) {
+			assertThat(context).isInstanceOf(ConfigurableApplicationContext.class)
+				.isInstanceOf(AdditionalContextInterface.class);
+		}
 	}
 
 }

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/assertj/AssertableReactiveWebApplicationContextTests.java

@@ -33,6 +33,7 @@ import static org.mockito.Mockito.withSettings;
 class AssertableReactiveWebApplicationContextTests {
 
 	@Test
+	@SuppressWarnings("resource")
 	void getShouldReturnProxy() {
 		AssertableReactiveWebApplicationContext context = AssertableReactiveWebApplicationContext
 			.get(() -> mock(ConfigurableReactiveWebApplicationContext.class));
@@ -41,12 +42,13 @@ class AssertableReactiveWebApplicationContextTests {
 
 	@Test
 	void getWhenHasAdditionalInterfaceShouldReturnProxy() {
-		AssertableReactiveWebApplicationContext context = AssertableReactiveWebApplicationContext.get(
+		try (AssertableReactiveWebApplicationContext context = AssertableReactiveWebApplicationContext.get(
 				() -> mock(ConfigurableReactiveWebApplicationContext.class,
 						withSettings().extraInterfaces(AdditionalContextInterface.class)),
-				AdditionalContextInterface.class);
-		assertThat(context).isInstanceOf(ConfigurableReactiveWebApplicationContext.class)
-			.isInstanceOf(AdditionalContextInterface.class);
+				AdditionalContextInterface.class)) {
+			assertThat(context).isInstanceOf(ConfigurableReactiveWebApplicationContext.class)
+				.isInstanceOf(AdditionalContextInterface.class);
+		}
 	}
 
 }

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/assertj/AssertableWebApplicationContextTests.java

@@ -33,6 +33,7 @@ import static org.mockito.Mockito.withSettings;
 class AssertableWebApplicationContextTests {
 
 	@Test
+	@SuppressWarnings("resource")
 	void getShouldReturnProxy() {
 		AssertableWebApplicationContext context = AssertableWebApplicationContext
 			.get(() -> mock(ConfigurableWebApplicationContext.class));
@@ -41,12 +42,13 @@ class AssertableWebApplicationContextTests {
 
 	@Test
 	void getWhenHasAdditionalInterfaceShouldReturnProxy() {
-		ConfigurableWebApplicationContext context = AssertableWebApplicationContext.get(
+		try (ConfigurableWebApplicationContext context = AssertableWebApplicationContext.get(
 				() -> mock(ConfigurableWebApplicationContext.class,
 						withSettings().extraInterfaces(AdditionalContextInterface.class)),
-				AdditionalContextInterface.class);
-		assertThat(context).isInstanceOf(ConfigurableWebApplicationContext.class)
-			.isInstanceOf(AdditionalContextInterface.class);
+				AdditionalContextInterface.class)) {
+			assertThat(context).isInstanceOf(ConfigurableWebApplicationContext.class)
+				.isInstanceOf(AdditionalContextInterface.class);
+		}
 	}
 
 }

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/docker/DockerApiTests.java

@@ -600,7 +600,7 @@ class DockerApiTests {
 		}
 
 		@Test
-		void createWithPlatformAndInsufficientApiVersionThrowsException() throws Exception {
+		void createWithPlatformAndInsufficientApiVersionThrowsException() {
 			ImageReference imageReference = ImageReference.of("ubuntu:bionic");
 			ContainerConfig config = ContainerConfig.of(imageReference, (update) -> update.withCommand("/bin/bash"));
 			ImagePlatform platform = ImagePlatform.of("linux/arm64/v1");

spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/json/AbstractJsonTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -17,8 +17,10 @@
 package org.springframework.boot.buildpack.platform.json;
 
 import java.io.BufferedReader;
+import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.UncheckedIOException;
 import java.nio.charset.StandardCharsets;
 import java.util.stream.Collectors;
 
@@ -45,8 +47,13 @@ public abstract class AbstractJsonTests {
 	}
 
 	protected final String getContentAsString(String name) {
-		return new BufferedReader(new InputStreamReader(getContent(name), StandardCharsets.UTF_8)).lines()
-			.collect(Collectors.joining("\n"));
+		try (InputStream in = getContent(name)) {
+			return new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8)).lines()
+				.collect(Collectors.joining("\n"));
+		}
+		catch (IOException ex) {
+			throw new UncheckedIOException(ex);
+		}
 	}
 
 }

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/main/java/org/springframework/boot/gradle/tasks/bundling/BootZipCopyAction.java

@@ -348,8 +348,11 @@ class BootZipCopyAction implements CopyAction {
 
 		private void writeJarModeLibrary(String location, JarModeLibrary library) throws IOException {
 			String name = location + library.getName();
-			writeEntry(name, ZipEntryContentWriter.fromInputStream(library.openStream()), false,
-					(entry) -> prepareStoredEntry(library.openStream(), entry));
+			writeEntry(name, ZipEntryContentWriter.fromInputStream(library.openStream()), false, (entry) -> {
+				try (InputStream in = library.openStream()) {
+					prepareStoredEntry(library.openStream(), entry);
+				}
+			});
 			if (BootZipCopyAction.this.layerResolver != null) {
 				Layer layer = BootZipCopyAction.this.layerResolver.getLayer(library);
 				this.layerIndex.add(layer, name);

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/plugin/NativeImagePluginActionIntegrationTests.java

@@ -122,9 +122,10 @@ class NativeImagePluginActionIntegrationTests {
 		BuildResult result = this.gradleBuild.build("bootJar");
 		assertThat(result.task(":bootJar").getOutcome()).isEqualTo(TaskOutcome.SUCCESS);
 		File buildLibs = new File(this.gradleBuild.getProjectDir(), "build/libs");
-		JarFile jarFile = new JarFile(new File(buildLibs, this.gradleBuild.getProjectDir().getName() + ".jar"));
-		Manifest manifest = jarFile.getManifest();
-		assertThat(manifest.getMainAttributes().getValue("Spring-Boot-Native-Processed")).isEqualTo("true");
+		try (JarFile jarFile = new JarFile(new File(buildLibs, this.gradleBuild.getProjectDir().getName() + ".jar"))) {
+			Manifest manifest = jarFile.getManifest();
+			assertThat(manifest.getMainAttributes().getValue("Spring-Boot-Native-Processed")).isEqualTo("true");
+		}
 	}
 
 	private String projectPath(String path) {

spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/nio/file/NestedFileSystemProvider.java

@@ -84,6 +84,7 @@ public class NestedFileSystemProvider extends FileSystemProvider {
 	}
 
 	@Override
+	@SuppressWarnings("resource")
 	public Path getPath(URI uri) {
 		NestedLocation location = NestedLocation.fromUri(uri);
 		synchronized (this.fileSystems) {

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/dockerTest/java/org/springframework/boot/maven/BuildImageTests.java

@@ -475,7 +475,6 @@ class BuildImageTests extends AbstractArchiveIntegrationTests {
 
 	@TestTemplate
 	void whenBuildImageIsInvokedWithCreatedDate(MavenBuild mavenBuild) {
-		String testBuildId = randomString();
 		mavenBuild.project("dockerTest", "build-image-created-date")
 			.goals("package")
 			.systemProperty("spring-boot.build-image.pullPolicy", "IF_NOT_PRESENT")

spring-boot-project/spring-boot-tools/spring-boot-test-support-docker/src/main/java/org/springframework/boot/testsupport/container/TestImage.java

@@ -88,6 +88,7 @@ public enum TestImage {
 	 * {@link org.testcontainers.containers.CassandraContainer}.
 	 * @deprecated since 3.4.0 for removal in 3.6.0 in favor of {@link #CASSANDRA}
 	 */
+	@SuppressWarnings("deprecation")
 	@Deprecated(since = "3.4.0", forRemoval = true)
 	CASSANDRA_DEPRECATED("cassandra", "3.11.10", () -> org.testcontainers.containers.CassandraContainer.class,
 			(container) -> ((org.testcontainers.containers.CassandraContainer<?>) container)
@@ -139,6 +140,7 @@ public enum TestImage {
 	 * deprecated {@link org.testcontainers.containers.KafkaContainer}.
 	 * @deprecated since 3.4.0 for removal in 3.6.0 in favor of {@link #CONFLUENT_KAFKA}
 	 */
+	@SuppressWarnings("deprecation")
 	@Deprecated(since = "3.4.0", forRemoval = true)
 	CONFLUENT_KAFKA_DEPRECATED("confluentinc/cp-kafka", "7.4.0",
 			() -> org.testcontainers.containers.KafkaContainer.class),

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/classpath/ModifiedClassPathClassLoader.java

@@ -99,6 +99,7 @@ final class ModifiedClassPathClassLoader extends URLClassLoader {
 		return super.loadClass(name);
 	}
 
+	@SuppressWarnings("resource")
 	static ModifiedClassPathClassLoader get(Class<?> testClass, Method testMethod, List<Object> arguments) {
 		Set<AnnotatedElement> candidates = new LinkedHashSet<>();
 		candidates.add(testClass);

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

@@ -67,6 +67,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void getReturnsRequestFactoryOfExpectedType() {
 		ClientHttpRequestFactory requestFactory = ClientHttpRequestFactories
 			.get(ClientHttpRequestFactorySettings.DEFAULTS);
@@ -74,6 +75,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void getOfGeneralTypeReturnsRequestFactoryOfExpectedType() {
 		ClientHttpRequestFactory requestFactory = ClientHttpRequestFactories.get(ClientHttpRequestFactory.class,
 				ClientHttpRequestFactorySettings.DEFAULTS);
@@ -81,6 +83,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void getOfSpecificTypeReturnsRequestFactoryOfExpectedType() {
 		ClientHttpRequestFactory requestFactory = ClientHttpRequestFactories.get(this.requestFactoryType,
 				ClientHttpRequestFactorySettings.DEFAULTS);
@@ -88,7 +91,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@Test
-	@SuppressWarnings("unchecked")
+	@SuppressWarnings({ "deprecation", "unchecked" })
 	void getReturnsRequestFactoryWithConfiguredConnectTimeout() {
 		ClientHttpRequestFactory requestFactory = ClientHttpRequestFactories
 			.get(ClientHttpRequestFactorySettings.DEFAULTS.withConnectTimeout(Duration.ofSeconds(60)));
@@ -96,7 +99,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@Test
-	@SuppressWarnings("unchecked")
+	@SuppressWarnings({ "deprecation", "unchecked" })
 	void getReturnsRequestFactoryWithConfiguredReadTimeout() {
 		ClientHttpRequestFactory requestFactory = ClientHttpRequestFactories
 			.get(ClientHttpRequestFactorySettings.DEFAULTS.withReadTimeout(Duration.ofSeconds(120)));
@@ -104,6 +107,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void shouldSetConnectTimeoutsWhenUsingReflective() {
 		Assumptions.assumeTrue(supportsSettingConnectTimeout());
 		ClientHttpRequestFactorySettings settings = ClientHttpRequestFactorySettings.DEFAULTS
@@ -114,6 +118,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@Test
+	@SuppressWarnings("deprecation")
 	void shouldSetReadTimeoutsWhenUsingReflective() {
 		Assumptions.assumeTrue(supportsSettingReadTimeout());
 		ClientHttpRequestFactorySettings settings = ClientHttpRequestFactorySettings.DEFAULTS
@@ -124,6 +129,7 @@ abstract class AbstractClientHttpRequestFactoriesTests<T extends ClientHttpReque
 	}
 
 	@ParameterizedTest
+	@SuppressWarnings("deprecation")
 	@ValueSource(strings = { "GET", "POST" })
 	void connectWithSslBundle(String httpMethod) throws Exception {
 		TomcatServletWebServerFactory webServerFactory = new TomcatServletWebServerFactory(0);

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

@@ -37,8 +37,10 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  * Tests for {@link ClientHttpRequestFactories}.
  *
  * @author Andy Wilkinson
+ * @deprecated since 3.4.0 for removal in 3.6.0
  */
 @SuppressWarnings("removal")
+@Deprecated(since = "3.4.0", forRemoval = true)
 class ClientHttpRequestFactoriesTests {
 
 	@Test

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

@@ -29,8 +29,10 @@ import static org.mockito.Mockito.mock;
  * Tests for {@link ClientHttpRequestFactorySettings}.
  *
  * @author Phillip Webb
+ * @deprecated since 3.4.0 for removal in 3.6.0
  */
 @SuppressWarnings("removal")
+@Deprecated(since = "3.4.0", forRemoval = true)
 class ClientHttpRequestFactorySettingsTests {
 
 	private static final Duration ONE_SECOND = Duration.ofSeconds(1);

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/reactive/server/AbstractReactiveWebServerFactoryTests.java

@@ -570,19 +570,16 @@ public abstract class AbstractReactiveWebServerFactoryTests {
 		factory.setHttp2(http2);
 		this.webServer = factory.getWebServer(new EchoHandler());
 		this.webServer.start();
-		org.eclipse.jetty.client.HttpClient client = new org.eclipse.jetty.client.HttpClient(
-				new HttpClientTransportOverHTTP2(new HTTP2Client()));
-		client.start();
-		try {
+
+		try (org.eclipse.jetty.client.HttpClient client = new org.eclipse.jetty.client.HttpClient(
+				new HttpClientTransportOverHTTP2(new HTTP2Client()))) {
+			client.start();
 			ContentResponse response = client.POST("http://localhost:" + this.webServer.getPort())
 				.body(new StringRequestContent("text/plain", "Hello World"))
 				.send();
 			assertThat(response.getStatus()).isEqualTo(HttpStatus.OK.value());
 			assertThat(response.getContentAsString()).isEqualTo("Hello World");
 		}
-		finally {
-			client.stop();
-		}
 	}
 
 	@Test

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/server/AbstractServletWebServerFactoryTests.java

@@ -1288,17 +1288,13 @@ public abstract class AbstractServletWebServerFactoryTests {
 		factory.setHttp2(http2);
 		this.webServer = factory.getWebServer(exampleServletRegistration());
 		this.webServer.start();
-		org.eclipse.jetty.client.HttpClient client = new org.eclipse.jetty.client.HttpClient(
-				new HttpClientTransportOverHTTP2(new HTTP2Client()));
-		client.start();
-		try {
+		try (org.eclipse.jetty.client.HttpClient client = new org.eclipse.jetty.client.HttpClient(
+				new HttpClientTransportOverHTTP2(new HTTP2Client()))) {
+			client.start();
 			ContentResponse response = client.GET("http://localhost:" + this.webServer.getPort() + "/hello");
 			assertThat(response.getStatus()).isEqualTo(HttpStatus.OK.value());
 			assertThat(response.getContentAsString()).isEqualTo("Hello World");
 		}
-		finally {
-			client.stop();
-		}
 	}
 
 	@Test

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

@@ -35,9 +35,11 @@ import static org.assertj.core.api.Assertions.assertThat;
  * available and, therefore, Jetty's client is used instead.
  *
  * @author Stephane Nicoll
+ * @deprecated since 3.4.0 for removal in 3.6.0
  */
 @ClassPathExclusions("httpclient5-*.jar")
 @SuppressWarnings("removal")
+@Deprecated(since = "3.4.0", forRemoval = true)
 class HttpWebServiceMessageSenderBuilderJettyClientIntegrationTests {
 
 	private final HttpWebServiceMessageSenderBuilder builder = new HttpWebServiceMessageSenderBuilder();

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

@@ -36,9 +36,11 @@ import static org.assertj.core.api.Assertions.assertThat;
  * predominant HTTP client.
  *
  * @author Andy Wilkinson
+ * @deprecated since 3.4.0 for removal in 3.6.0
  */
 @ClassPathExclusions({ "httpclient5-*.jar", "jetty-client-*.jar" })
 @SuppressWarnings("removal")
+@Deprecated(since = "3.4.0", forRemoval = true)
 class HttpWebServiceMessageSenderBuilderReactorClientIntegrationTests {
 
 	private final HttpWebServiceMessageSenderBuilder builder = new HttpWebServiceMessageSenderBuilder();

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

@@ -33,9 +33,11 @@ import static org.assertj.core.api.Assertions.assertThat;
  * available
  *
  * @author Stephane Nicoll
+ * @deprecated since 3.4.0 for removal in 3.6.0
  */
 @ClassPathExclusions({ "httpclient5-*.jar", "jetty-client-*.jar", "reactor-netty-http-*.jar" })
 @SuppressWarnings("removal")
+@Deprecated(since = "3.4.0", forRemoval = true)
 class HttpWebServiceMessageSenderBuilderSimpleIntegrationTests {
 
 	private final HttpWebServiceMessageSenderBuilder builder = new HttpWebServiceMessageSenderBuilder();

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

@@ -33,8 +33,10 @@ import static org.mockito.Mockito.mock;
  * Tests for {@link HttpWebServiceMessageSenderBuilder}.
  *
  * @author Stephane Nicoll
+ * @deprecated since 3.4.0 for removal in 3.6.0
  */
 @SuppressWarnings("removal")
+@Deprecated(since = "3.4.0", forRemoval = true)
 class HttpWebServiceMessageSenderBuilderTests {
 
 	@Test