Merge branch '3.4.x'

Closes gh-45231

buildSrc/src/main/java/org/springframework/boot/build/architecture/ArchitectureCheck.java

@@ -18,11 +18,15 @@ package org.springframework.boot.build.architecture;
 
 import java.io.File;
 import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.concurrent.Callable;
 import java.util.function.Supplier;
 import java.util.stream.Stream;
 
@@ -33,11 +37,13 @@ import com.tngtech.archunit.lang.EvaluationResult;
 import org.gradle.api.DefaultTask;
 import org.gradle.api.Task;
 import org.gradle.api.Transformer;
+import org.gradle.api.file.ConfigurableFileCollection;
 import org.gradle.api.file.DirectoryProperty;
 import org.gradle.api.file.FileCollection;
 import org.gradle.api.file.FileTree;
 import org.gradle.api.provider.ListProperty;
 import org.gradle.api.provider.Property;
+import org.gradle.api.tasks.Classpath;
 import org.gradle.api.tasks.IgnoreEmptyDirectories;
 import org.gradle.api.tasks.Input;
 import org.gradle.api.tasks.InputFiles;
@@ -58,6 +64,7 @@ import org.gradle.api.tasks.VerificationException;
  * @author Scott Frederick
  * @author Ivan Malutin
  * @author Phillip Webb
+ * @author Dmytro Nosan
  */
 public abstract class ArchitectureCheck extends DefaultTask {
 
@@ -80,14 +87,17 @@ public abstract class ArchitectureCheck extends DefaultTask {
 	}
 
 	@TaskAction
-	void checkArchitecture() throws IOException {
-		JavaClasses javaClasses = new ClassFileImporter().importPaths(classFilesPaths());
-		List<EvaluationResult> violations = evaluate(javaClasses).filter(EvaluationResult::hasViolation).toList();
-		File outputFile = getOutputDirectory().file("failure-report.txt").get().getAsFile();
-		writeViolationReport(violations, outputFile);
-		if (!violations.isEmpty()) {
-			throw new VerificationException("Architecture check failed. See '" + outputFile + "' for details.");
-		}
+	void checkArchitecture() throws Exception {
+		withCompileClasspath(() -> {
+			JavaClasses javaClasses = new ClassFileImporter().importPaths(classFilesPaths());
+			List<EvaluationResult> violations = evaluate(javaClasses).filter(EvaluationResult::hasViolation).toList();
+			File outputFile = getOutputDirectory().file("failure-report.txt").get().getAsFile();
+			writeViolationReport(violations, outputFile);
+			if (!violations.isEmpty()) {
+				throw new VerificationException("Architecture check failed. See '" + outputFile + "' for details.");
+			}
+			return null;
+		});
 	}
 
 	private List<Path> classFilesPaths() {
@@ -98,6 +108,22 @@ public abstract class ArchitectureCheck extends DefaultTask {
 		return getRules().get().stream().map((rule) -> rule.evaluate(javaClasses));
 	}
 
+	private void withCompileClasspath(Callable<?> callable) throws Exception {
+		ClassLoader previous = Thread.currentThread().getContextClassLoader();
+		try {
+			List<URL> urls = new ArrayList<>();
+			for (File file : getCompileClasspath().getFiles()) {
+				urls.add(file.toURI().toURL());
+			}
+			ClassLoader classLoader = new URLClassLoader(urls.toArray(new URL[0]), getClass().getClassLoader());
+			Thread.currentThread().setContextClassLoader(classLoader);
+			callable.call();
+		}
+		finally {
+			Thread.currentThread().setContextClassLoader(previous);
+		}
+	}
+
 	private void writeViolationReport(List<EvaluationResult> violations, File outputFile) throws IOException {
 		outputFile.getParentFile().mkdirs();
 		StringBuilder report = new StringBuilder();
@@ -126,6 +152,10 @@ public abstract class ArchitectureCheck extends DefaultTask {
 		return this.classes.getAsFileTree();
 	}
 
+	@InputFiles
+	@Classpath
+	public abstract ConfigurableFileCollection getCompileClasspath();
+
 	@Optional
 	@InputFiles
 	@PathSensitive(PathSensitivity.RELATIVE)

buildSrc/src/main/java/org/springframework/boot/build/architecture/ArchitecturePlugin.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -49,6 +49,7 @@ public class ArchitecturePlugin implements Plugin<Project> {
 			TaskProvider<ArchitectureCheck> checkPackageTangles = project.getTasks()
 				.register("checkArchitecture" + StringUtils.capitalize(sourceSet.getName()), ArchitectureCheck.class,
 						(task) -> {
+							task.getCompileClasspath().from(sourceSet.getCompileClasspath());
 							task.setClasses(sourceSet.getOutput().getClassesDirs());
 							task.getResourcesDirectory().set(sourceSet.getOutput().getResourcesDir());
 							task.dependsOn(sourceSet.getProcessResourcesTaskName());

buildSrc/src/test/java/org/springframework/boot/build/architecture/ArchitectureCheckTests.java

@@ -16,22 +16,20 @@
 
 package org.springframework.boot.build.architecture;
 
-import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.function.Consumer;
 
-import org.gradle.api.GradleException;
-import org.gradle.api.Project;
-import org.gradle.testfixtures.ProjectBuilder;
+import org.gradle.testkit.runner.GradleRunner;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 
-import org.springframework.core.io.Resource;
-import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.core.io.ClassPathResource;
 import org.springframework.util.FileSystemUtils;
-import org.springframework.util.function.ThrowingConsumer;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 /**
  * Tests for {@link ArchitectureCheck}.
@@ -39,188 +37,206 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  * @author Andy Wilkinson
  * @author Scott Frederick
  * @author Ivan Malutin
+ * @author Dmytro Nosan
  */
 class ArchitectureCheckTests {
 
-	@TempDir
-	File temp;
+	private Path projectDir;
 
-	@Test
-	void whenPackagesAreTangledTaskFailsAndWritesAReport() throws Exception {
-		prepareTask("tangled", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	private Path buildFile;
+
+	@BeforeEach
+	void setup(@TempDir Path projectDir) {
+		this.projectDir = projectDir;
+		this.buildFile = projectDir.resolve("build.gradle");
 	}
 
 	@Test
-	void whenPackagesAreNotTangledTaskSucceedsAndWritesAnEmptyReport() throws Exception {
-		prepareTask("untangled", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+	void whenPackagesAreTangledTaskFailsAndWritesAReport() throws IOException {
+		runGradleWithCompiledClasses("tangled",
+				shouldHaveFailureReportWithMessage("slices matching '(**)' should be free of cycles"));
 	}
 
-	File failureReport(ArchitectureCheck architectureCheck) {
-		return architectureCheck.getProject()
-			.getLayout()
-			.getBuildDirectory()
-			.file("checkArchitecture/failure-report.txt")
-			.get()
-			.getAsFile();
+	@Test
+	void whenPackagesAreNotTangledTaskSucceedsAndWritesAnEmptyReport() throws IOException {
+		runGradleWithCompiledClasses("untangled", shouldHaveEmptyFailureReport());
 	}
 
 	@Test
-	void whenBeanPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport() throws Exception {
-		prepareTask("bpp/nonstatic", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	void whenBeanPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport() throws IOException {
+		runGradleWithCompiledClasses("bpp/nonstatic",
+				shouldHaveFailureReportWithMessage(
+						"methods that are annotated with @Bean and have raw return type assignable "
+								+ "to org.springframework.beans.factory.config.BeanPostProcessor"));
 	}
 
 	@Test
-	void whenBeanPostProcessorBeanMethodIsStaticAndHasUnsafeParametersTaskFailsAndWritesAReport() throws Exception {
-		prepareTask("bpp/unsafeparameters", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	void whenBeanPostProcessorBeanMethodIsStaticAndHasUnsafeParametersTaskFailsAndWritesAReport() throws IOException {
+		runGradleWithCompiledClasses("bpp/unsafeparameters",
+				shouldHaveFailureReportWithMessage(
+						"methods that are annotated with @Bean and have raw return type assignable "
+								+ "to org.springframework.beans.factory.config.BeanPostProcessor"));
 	}
 
 	@Test
 	void whenBeanPostProcessorBeanMethodIsStaticAndHasSafeParametersTaskSucceedsAndWritesAnEmptyReport()
-			throws Exception {
-		prepareTask("bpp/safeparameters", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+			throws IOException {
+		runGradleWithCompiledClasses("bpp/safeparameters", shouldHaveEmptyFailureReport());
 	}
 
 	@Test
 	void whenBeanPostProcessorBeanMethodIsStaticAndHasNoParametersTaskSucceedsAndWritesAnEmptyReport()
-			throws Exception {
-		prepareTask("bpp/noparameters", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+			throws IOException {
+		runGradleWithCompiledClasses("bpp/noparameters", shouldHaveEmptyFailureReport());
 	}
 
 	@Test
-	void whenBeanFactoryPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport() throws Exception {
-		prepareTask("bfpp/nonstatic", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	void whenBeanFactoryPostProcessorBeanMethodIsNotStaticTaskFailsAndWritesAReport() throws IOException {
+		runGradleWithCompiledClasses("bfpp/nonstatic",
+				shouldHaveFailureReportWithMessage("methods that are annotated with @Bean and have raw return "
+						+ "type assignable to org.springframework.beans.factory.config.BeanFactoryPostProcessor"));
 	}
 
 	@Test
-	void whenBeanFactoryPostProcessorBeanMethodIsStaticAndHasParametersTaskFailsAndWritesAReport() throws Exception {
-		prepareTask("bfpp/parameters", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	void whenBeanFactoryPostProcessorBeanMethodIsStaticAndHasParametersTaskFailsAndWritesAReport() throws IOException {
+		runGradleWithCompiledClasses("bfpp/parameters",
+				shouldHaveFailureReportWithMessage("methods that are annotated with @Bean and have raw return "
+						+ "type assignable to org.springframework.beans.factory.config.BeanFactoryPostProcessor"));
 	}
 
 	@Test
 	void whenBeanFactoryPostProcessorBeanMethodIsStaticAndHasNoParametersTaskSucceedsAndWritesAnEmptyReport()
-			throws Exception {
-		prepareTask("bfpp/noparameters", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+			throws IOException {
+		runGradleWithCompiledClasses("bfpp/noparameters", shouldHaveEmptyFailureReport());
+	}
+
+	@Test
+	void whenClassLoadsResourceUsingResourceUtilsTaskFailsAndWritesReport() throws IOException {
+		runGradleWithCompiledClasses("resources/loads", shouldHaveFailureReportWithMessage(
+				"no classes should call method where target owner type org.springframework.util.ResourceUtils and target name 'getURL'"));
 	}
 
 	@Test
-	void whenClassLoadsResourceUsingResourceUtilsTaskFailsAndWritesReport() throws Exception {
-		prepareTask("resources/loads", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	void whenClassUsesResourceUtilsWithoutLoadingResourcesTaskSucceedsAndWritesAnEmptyReport() throws IOException {
+		runGradleWithCompiledClasses("resources/noloads", shouldHaveEmptyFailureReport());
 	}
 
 	@Test
-	void whenClassUsesResourceUtilsWithoutLoadingResourcesTaskSucceedsAndWritesAnEmptyReport() throws Exception {
-		prepareTask("resources/noloads", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+	void whenClassDoesNotCallObjectsRequireNonNullTaskSucceedsAndWritesAnEmptyReport() throws IOException {
+		runGradleWithCompiledClasses("objects/noRequireNonNull", shouldHaveEmptyFailureReport());
 	}
 
 	@Test
-	void whenClassDoesNotCallObjectsRequireNonNullTaskSucceedsAndWritesAnEmptyReport() throws Exception {
-		prepareTask("objects/noRequireNonNull", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+	void whenClassCallsObjectsRequireNonNullWithMessageTaskFailsAndWritesReport() throws IOException {
+		runGradleWithCompiledClasses("objects/requireNonNullWithString", shouldHaveFailureReportWithMessage(
+				"no classes should call method Objects.requireNonNull(Object, String)"));
 	}
 
 	@Test
-	void whenClassCallsObjectsRequireNonNullWithMessageTaskFailsAndWritesReport() throws Exception {
-		prepareTask("objects/requireNonNullWithString", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	void whenClassCallsObjectsRequireNonNullWithSupplierTaskFailsAndWritesReport() throws IOException {
+		runGradleWithCompiledClasses("objects/requireNonNullWithSupplier", shouldHaveFailureReportWithMessage(
+				"no classes should call method Objects.requireNonNull(Object, Supplier)"));
 	}
 
 	@Test
-	void whenClassCallsObjectsRequireNonNullWithSupplierTaskFailsAndWritesReport() throws Exception {
-		prepareTask("objects/requireNonNullWithSupplier", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty();
-		});
+	void whenClassCallsStringToUpperCaseWithoutLocaleFailsAndWritesReport() throws IOException {
+		runGradleWithCompiledClasses("string/toUpperCase",
+				shouldHaveFailureReportWithMessage("because String.toUpperCase(Locale.ROOT) should be used instead"));
 	}
 
 	@Test
-	void whenClassCallsStringToUpperCaseWithoutLocaleFailsAndWritesReport() throws Exception {
-		prepareTask("string/toUpperCase", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty()
-				.content()
-				.contains("because String.toUpperCase(Locale.ROOT) should be used instead");
-		});
+	void whenClassCallsStringToLowerCaseWithoutLocaleFailsAndWritesReport() throws IOException {
+		runGradleWithCompiledClasses("string/toLowerCase",
+				shouldHaveFailureReportWithMessage("because String.toLowerCase(Locale.ROOT) should be used instead"));
 	}
 
 	@Test
-	void whenClassCallsStringToLowerCaseWithoutLocaleFailsAndWritesReport() throws Exception {
-		prepareTask("string/toLowerCase", (architectureCheck) -> {
-			assertThatExceptionOfType(GradleException.class).isThrownBy(architectureCheck::checkArchitecture);
-			assertThat(failureReport(architectureCheck)).isNotEmpty()
-				.content()
-				.contains("because String.toLowerCase(Locale.ROOT) should be used instead");
-		});
+	void whenClassCallsStringToLowerCaseWithLocaleShouldNotFail() throws IOException {
+		runGradleWithCompiledClasses("string/toLowerCaseWithLocale", shouldHaveEmptyFailureReport());
 	}
 
 	@Test
-	void whenClassCallsStringToLowerCaseWithLocaleShouldNotFail() throws Exception {
-		prepareTask("string/toLowerCaseWithLocale", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+	void whenClassCallsStringToUpperCaseWithLocaleShouldNotFail() throws IOException {
+		runGradleWithCompiledClasses("string/toUpperCaseWithLocale", shouldHaveEmptyFailureReport());
 	}
 
 	@Test
-	void whenClassCallsStringToUpperCaseWithLocaleShouldNotFail() throws Exception {
-		prepareTask("string/toUpperCaseWithLocale", (architectureCheck) -> {
-			architectureCheck.checkArchitecture();
-			assertThat(failureReport(architectureCheck)).isEmpty();
-		});
+	void whenBeanPostProcessorBeanMethodIsNotStaticWithExternalClass() throws IOException {
+		Files.writeString(this.buildFile, """
+				plugins {
+					id 'java'
+					id 'org.springframework.boot.architecture'
+				}
+				repositories {
+					mavenCentral()
+				}
+				java {
+					sourceCompatibility = 17
+				}
+				dependencies {
+					implementation("org.springframework.integration:spring-integration-jmx:6.3.9")
+				}
+				""");
+		Path testClass = this.projectDir.resolve("src/main/java/boot/architecture/bpp/external/TestClass.java");
+		Files.createDirectories(testClass.getParent());
+		Files.writeString(testClass, """
+				package org.springframework.boot.build.architecture.bpp.external;
+				import org.springframework.context.annotation.Bean;
+				import org.springframework.integration.monitor.IntegrationMBeanExporter;
+				public class TestClass {
+					@Bean
+					IntegrationMBeanExporter integrationMBeanExporter() {
+						return new IntegrationMBeanExporter();
+					}
+				}
+				""");
+		runGradle(shouldHaveFailureReportWithMessage("methods that are annotated with @Bean and have raw return "
+				+ "type assignable to org.springframework.beans.factory.config.BeanPostProcessor "));
 	}
 
-	private void prepareTask(String classes, ThrowingConsumer<ArchitectureCheck> callback) throws Exception {
-		File projectDir = new File(this.temp, "project");
-		projectDir.mkdirs();
-		copyClasses(classes, projectDir);
-		Project project = ProjectBuilder.builder().withProjectDir(projectDir).build();
-		project.getTasks().register("checkArchitecture", ArchitectureCheck.class, (task) -> {
-			task.setClasses(project.files("classes"));
-			callback.accept(task);
-		});
+	private Consumer<GradleRunner> shouldHaveEmptyFailureReport() {
+		return (gradleRunner) -> {
+			assertThat(gradleRunner.build().getOutput()).contains("BUILD SUCCESSFUL")
+				.contains("Task :checkArchitectureMain");
+			assertThat(failureReport()).isEmptyFile();
+		};
+	}
+
+	private Consumer<GradleRunner> shouldHaveFailureReportWithMessage(String message) {
+		return (gradleRunner) -> {
+			assertThat(gradleRunner.buildAndFail().getOutput()).contains("BUILD FAILED")
+				.contains("Task :checkArchitectureMain FAILED");
+			assertThat(failureReport()).content().contains(message);
+		};
+	}
+
+	private void runGradleWithCompiledClasses(String path, Consumer<GradleRunner> callback) throws IOException {
+		ClassPathResource classPathResource = new ClassPathResource(path, getClass());
+		FileSystemUtils.copyRecursively(classPathResource.getFile().toPath(),
+				this.projectDir.resolve("classes").resolve(classPathResource.getPath()));
+		Files.writeString(this.buildFile, """
+				plugins {
+					 id 'java'
+					 id 'org.springframework.boot.architecture'
+				}
+				sourceSets {
+					main {
+						  output.classesDirs.setFrom(file("classes"))
+					  }
+				}
+				""");
+		runGradle(callback);
+	}
+
+	private void runGradle(Consumer<GradleRunner> callback) {
+		callback.accept(GradleRunner.create()
+			.withProjectDir(this.projectDir.toFile())
+			.withArguments("checkArchitectureMain")
+			.withPluginClasspath());
 	}
 
-	private void copyClasses(String name, File projectDir) throws IOException {
-		PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
-		Resource root = resolver.getResource("classpath:org/springframework/boot/build/architecture/" + name);
-		FileSystemUtils.copyRecursively(root.getFile(),
-				new File(projectDir, "classes/org/springframework/boot/build/architecture/" + name));
+	private Path failureReport() {
+		return this.projectDir.resolve("build/checkArchitectureMain/failure-report.txt");
 	}
 
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/FilterOrderingIntegrationTests.java

@@ -103,7 +103,7 @@ class FilterOrderingIntegrationTests {
 		}
 
 		@Bean
-		WebServerFactoryCustomizerBeanPostProcessor ServletWebServerCustomizerBeanPostProcessor() {
+		static WebServerFactoryCustomizerBeanPostProcessor servletWebServerCustomizerBeanPostProcessor() {
 			return new WebServerFactoryCustomizerBeanPostProcessor();
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/HttpEncodingAutoConfigurationTests.java

@@ -211,12 +211,12 @@ class HttpEncodingAutoConfigurationTests {
 	static class MinimalWebAutoConfiguration {
 
 		@Bean
-		MockServletWebServerFactory MockServletWebServerFactory() {
+		MockServletWebServerFactory mockServletWebServerFactory() {
 			return new MockServletWebServerFactory();
 		}
 
 		@Bean
-		WebServerFactoryCustomizerBeanPostProcessor ServletWebServerCustomizerBeanPostProcessor() {
+		static WebServerFactoryCustomizerBeanPostProcessor servletWebServerCustomizerBeanPostProcessor() {
 			return new WebServerFactoryCustomizerBeanPostProcessor();
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java

@@ -1133,7 +1133,7 @@ class WebMvcAutoConfigurationTests {
 		}
 
 		@Bean
-		WebServerFactoryCustomizerBeanPostProcessor ServletWebServerCustomizerBeanPostProcessor() {
+		static WebServerFactoryCustomizerBeanPostProcessor servletWebServerCustomizerBeanPostProcessor() {
 			return new WebServerFactoryCustomizerBeanPostProcessor();
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/websocket/servlet/WebSocketServletAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -183,7 +183,7 @@ class WebSocketServletAutoConfigurationTests {
 		}
 
 		@Bean
-		WebServerFactoryCustomizerBeanPostProcessor ServletWebServerCustomizerBeanPostProcessor() {
+		static WebServerFactoryCustomizerBeanPostProcessor servletWebServerCustomizerBeanPostProcessor() {
 			return new WebServerFactoryCustomizerBeanPostProcessor();
 		}