Fix checkstyle RedundantModifier test violations

pom.xml

@@ -75,7 +75,7 @@
 									<propertyExpansion>main.basedir=${main.basedir}</propertyExpansion>
 									<sourceDirectories>${basedir}</sourceDirectories>
 									<includes>**/*</includes>
-									<excludes>.git/**/*,target/**/,**/.flattened-pom.xml</excludes>
+									<excludes>.git/**/*,target/**/,**/.flattened-pom.xml,**/*.class,**/spring-boot-gradle-plugin/build/**</excludes>
 								</configuration>
 								<goals>
 									<goal>check</goal>

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/condition/ConditionsReportEndpointTests.java

@@ -63,7 +63,7 @@ class ConditionsReportEndpointTests {
 
 		private final ConfigurableApplicationContext context;
 
-		public Config(ConfigurableApplicationContext context) {
+		Config(ConfigurableApplicationContext context) {
 			this.context = context;
 		}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointSerializationTests.java

@@ -392,7 +392,7 @@ class ConfigurationPropertiesReportEndpointSerializationTests {
 
 		private Foo self;
 
-		public SelfReferential() {
+		SelfReferential() {
 			this.self = this;
 		}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointTests.java

@@ -266,7 +266,7 @@ class ConfigurationPropertiesReportEndpointTests {
 
 		private Duration duration = Duration.ofSeconds(10);
 
-		public TestProperties() {
+		TestProperties() {
 			this.secrets.put("mine", "myPrivateThing");
 			this.secrets.put("yours", "yourPrivateThing");
 			this.listItems.add(new ListItem());

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/WebFluxEndpointIntegrationTests.java

@@ -57,7 +57,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 class WebFluxEndpointIntegrationTests
 		extends AbstractWebEndpointIntegrationTests<AnnotationConfigReactiveWebServerApplicationContext> {
 
-	public WebFluxEndpointIntegrationTests() {
+	WebFluxEndpointIntegrationTests() {
 		super(WebFluxEndpointIntegrationTests::createApplicationContext,
 				WebFluxEndpointIntegrationTests::applyAuthenticatedConfiguration);
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/servlet/MvcWebEndpointIntegrationTests.java

@@ -67,7 +67,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 class MvcWebEndpointIntegrationTests
 		extends AbstractWebEndpointIntegrationTests<AnnotationConfigServletWebServerApplicationContext> {
 
-	public MvcWebEndpointIntegrationTests() {
+	MvcWebEndpointIntegrationTests() {
 		super(MvcWebEndpointIntegrationTests::createApplicationContext,
 				MvcWebEndpointIntegrationTests::applyAuthenticatedConfiguration);
 	}

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/mail/MailHealthIndicatorTests.java

@@ -83,7 +83,7 @@ class MailHealthIndicatorTests {
 
 	public static class SuccessTransport extends Transport {
 
-		public SuccessTransport(Session session, URLName urlName) {
+		SuccessTransport(Session session, URLName urlName) {
 			super(session, urlName);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/condition/ConditionalOnBeanTests.java

@@ -477,7 +477,7 @@ class ConditionalOnBeanTests {
 
 		private String value;
 
-		public ExampleBean(String value) {
+		ExampleBean(String value) {
 			this.value = value;
 		}
 
@@ -490,7 +490,7 @@ class ConditionalOnBeanTests {
 
 	public static class CustomExampleBean extends ExampleBean {
 
-		public CustomExampleBean() {
+		CustomExampleBean() {
 			super("custom subclass");
 		}
 
@@ -498,7 +498,7 @@ class ConditionalOnBeanTests {
 
 	public static class OtherExampleBean extends ExampleBean {
 
-		public OtherExampleBean() {
+		OtherExampleBean() {
 			super("other subclass");
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jackson/JacksonAutoConfigurationTests.java

@@ -400,7 +400,7 @@ class JacksonAutoConfigurationTests {
 
 	public static class MyDateFormat extends SimpleDateFormat {
 
-		public MyDateFormat() {
+		MyDateFormat() {
 			super("yyyy-MM-dd HH:mm:ss");
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationCustomFilterContextPathTests.java

@@ -77,7 +77,7 @@ class JerseyAutoConfigurationCustomFilterContextPathTests {
 			return "Hello " + this.msg;
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationCustomFilterPathTests.java

@@ -76,7 +76,7 @@ class JerseyAutoConfigurationCustomFilterPathTests {
 			return "Hello " + this.msg;
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationCustomLoadOnStartupTests.java

@@ -57,7 +57,7 @@ class JerseyAutoConfigurationCustomLoadOnStartupTests {
 	@MinimalWebConfiguration
 	public static class Application extends ResourceConfig {
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationCustomObjectMapperProviderTests.java

@@ -75,7 +75,7 @@ class JerseyAutoConfigurationCustomObjectMapperProviderTests {
 			return new Message("Jersey", null);
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 
@@ -91,7 +91,7 @@ class JerseyAutoConfigurationCustomObjectMapperProviderTests {
 
 		private String body;
 
-		public Message(String subject, String body) {
+		Message(String subject, String body) {
 			this.subject = subject;
 			this.body = body;
 		}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationCustomServletContextPathTests.java

@@ -76,7 +76,7 @@ class JerseyAutoConfigurationCustomServletContextPathTests {
 			return "Hello " + this.msg;
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationCustomServletPathTests.java

@@ -76,7 +76,7 @@ class JerseyAutoConfigurationCustomServletPathTests {
 			return "Hello " + this.msg;
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationDefaultFilterPathTests.java

@@ -74,7 +74,7 @@ class JerseyAutoConfigurationDefaultFilterPathTests {
 			return "Hello " + this.msg;
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationDefaultServletPathTests.java

@@ -69,7 +69,7 @@ class JerseyAutoConfigurationDefaultServletPathTests {
 		@Value("${message:World}")
 		private String msg;
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationObjectMapperProviderTests.java

@@ -77,7 +77,7 @@ class JerseyAutoConfigurationObjectMapperProviderTests {
 			return new Message("Jersey", null);
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 
@@ -93,11 +93,10 @@ class JerseyAutoConfigurationObjectMapperProviderTests {
 
 		private String body;
 
-		public Message() {
-
+		Message() {
 		}
 
-		public Message(String subject, String body) {
+		Message(String subject, String body) {
 			this.subject = subject;
 			this.body = body;
 		}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jersey/JerseyAutoConfigurationWithoutApplicationPathTests.java

@@ -74,7 +74,7 @@ class JerseyAutoConfigurationWithoutApplicationPathTests {
 			return "Hello " + this.msg;
 		}
 
-		public Application() {
+		Application() {
 			register(Application.class);
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/orm/jpa/AbstractJpaAutoConfigurationTests.java

@@ -373,7 +373,7 @@ abstract class AbstractJpaAutoConfigurationTests {
 
 		private final DataSource dataSource;
 
-		public TestConfigurationWithCustomPersistenceUnitManager(DataSource dataSource) {
+		TestConfigurationWithCustomPersistenceUnitManager(DataSource dataSource) {
 			this.dataSource = dataSource;
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfigurationTests.java

@@ -87,7 +87,7 @@ import static org.mockito.Mockito.mock;
  */
 class HibernateJpaAutoConfigurationTests extends AbstractJpaAutoConfigurationTests {
 
-	public HibernateJpaAutoConfigurationTests() {
+	HibernateJpaAutoConfigurationTests() {
 		super(HibernateJpaAutoConfiguration.class);
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/quartz/QuartzAutoConfigurationTests.java

@@ -388,7 +388,7 @@ class QuartzAutoConfigurationTests {
 
 	public static class ComponentThatUsesScheduler {
 
-		public ComponentThatUsesScheduler(Scheduler scheduler) {
+		ComponentThatUsesScheduler(Scheduler scheduler) {
 			Assert.notNull(scheduler, "Scheduler must not be null");
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/security/servlet/SecurityFilterAutoConfigurationEarlyInitializationTests.java

@@ -103,7 +103,7 @@ class SecurityFilterAutoConfigurationEarlyInitializationTests {
 
 		private static final long serialVersionUID = 1L;
 
-		public JacksonModuleBean(DeserializerBean myDeser) {
+		JacksonModuleBean(DeserializerBean myDeser) {
 			addDeserializer(SourceType.class, myDeser);
 		}
 
@@ -115,7 +115,7 @@ class SecurityFilterAutoConfigurationEarlyInitializationTests {
 		@Autowired
 		ConversionService conversionService;
 
-		public DeserializerBean() {
+		DeserializerBean() {
 			super(SourceType.class);
 		}
 

spring-boot-project/spring-boot-cli/src/main/java/org/springframework/boot/cli/app/SpringApplicationLauncher.java

@@ -60,7 +60,8 @@ public class SpringApplicationLauncher {
 		Map<String, Object> defaultProperties = new HashMap<>();
 		defaultProperties.put("spring.groovy.template.check-template-location", "false");
 		Class<?> applicationClass = this.classLoader.loadClass(getSpringApplicationClassName());
-		Constructor<?> constructor = applicationClass.getConstructor(Class[].class);
+		Constructor<?> constructor = applicationClass.getDeclaredConstructor(Class[].class);
+		constructor.setAccessible(true);
 		Object application = constructor.newInstance((Object) sources);
 		applicationClass.getMethod("setDefaultProperties", Map.class).invoke(application, defaultProperties);
 		Method method = applicationClass.getMethod("run", String[].class);

spring-boot-project/spring-boot-cli/src/test/java/org/springframework/boot/cli/app/SpringApplicationLauncherTests.java

@@ -122,7 +122,7 @@ class SpringApplicationLauncherTests {
 
 		private static String[] args;
 
-		public TestSpringApplication(Class<?>[] sources) {
+		TestSpringApplication(Class<?>[] sources) {
 			TestSpringApplication.sources = sources;
 		}
 

spring-boot-project/spring-boot-cli/src/test/java/org/springframework/boot/cli/command/init/InitCommandTests.java

@@ -59,7 +59,7 @@ class InitCommandTests extends AbstractHttpClientMockTests {
 		MockitoAnnotations.initMocks(this);
 	}
 
-	public InitCommandTests() {
+	InitCommandTests() {
 		InitializrService initializrService = new InitializrService(this.http);
 		this.handler = new TestableInitCommandOptionHandler(initializrService);
 		this.command = new InitCommand(this.handler);

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/classpath/ClassPathFileSystemWatcherTests.java

@@ -90,7 +90,7 @@ class ClassPathFileSystemWatcherTests {
 
 		public final Environment environment;
 
-		public Config(Environment environment) {
+		Config(Environment environment) {
 			this.environment = environment;
 		}
 

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/RestartScopeInitializerTests.java

@@ -72,7 +72,7 @@ class RestartScopeInitializerTests {
 
 	public static class ScopeTestBean implements ApplicationListener<ContextRefreshedEvent> {
 
-		public ScopeTestBean() {
+		ScopeTestBean() {
 			createCount.incrementAndGet();
 		}
 

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/web/htmlunit/LocalHostWebClientTests.java

@@ -49,7 +49,7 @@ class LocalHostWebClientTests {
 	@Captor
 	private ArgumentCaptor<WebRequest> requestCaptor;
 
-	public LocalHostWebClientTests() {
+	LocalHostWebClientTests() {
 		MockitoAnnotations.initMocks(this);
 	}
 

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/web/htmlunit/webdriver/LocalHostWebConnectionHtmlUnitDriverTests.java

@@ -50,7 +50,7 @@ class LocalHostWebConnectionHtmlUnitDriverTests {
 	@Mock
 	private WebClient webClient;
 
-	public LocalHostWebConnectionHtmlUnitDriverTests() {
+	LocalHostWebConnectionHtmlUnitDriverTests() {
 		MockitoAnnotations.initMocks(this);
 		given(this.webClient.getOptions()).willReturn(new WebClientOptions());
 		given(this.webClient.getWebConsole()).willReturn(new WebConsole());
@@ -108,7 +108,7 @@ class LocalHostWebConnectionHtmlUnitDriverTests {
 
 	public class TestLocalHostWebConnectionHtmlUnitDriver extends LocalHostWebConnectionHtmlUnitDriver {
 
-		public TestLocalHostWebConnectionHtmlUnitDriver(Environment environment) {
+		TestLocalHostWebConnectionHtmlUnitDriver(Environment environment) {
 			super(environment);
 		}
 

spring-boot-project/spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/PropertiesLauncher.java

@@ -21,6 +21,7 @@ import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UnsupportedEncodingException;
+import java.lang.reflect.Constructor;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.net.URLConnection;
@@ -42,6 +43,7 @@ import org.springframework.boot.loader.archive.Archive.EntryFilter;
 import org.springframework.boot.loader.archive.ExplodedArchive;
 import org.springframework.boot.loader.archive.JarFileArchive;
 import org.springframework.boot.loader.util.SystemPropertyUtils;
+import org.springframework.util.Assert;
 
 /**
  * {@link Launcher} for archives with user-configured classpath and main class via a
@@ -73,6 +75,14 @@ import org.springframework.boot.loader.util.SystemPropertyUtils;
  */
 public class PropertiesLauncher extends Launcher {
 
+	private static final Class<?>[] PARENT_ONLY_PARAMS = new Class<?>[] { ClassLoader.class };
+
+	private static final Class<?>[] URLS_AND_PARENT_PARAMS = new Class<?>[] { URL[].class, ClassLoader.class };
+
+	private static final Class<?>[] NO_PARAMS = new Class<?>[] {};
+
+	private static final URL[] NO_URLS = new URL[0];
+
 	private static final String DEBUG = "loader.debug";
 
 	/**
@@ -339,7 +349,7 @@ public class PropertiesLauncher extends Launcher {
 		for (Archive archive : archives) {
 			urls.add(archive.getUrl());
 		}
-		ClassLoader loader = new LaunchedURLClassLoader(urls.toArray(new URL[0]), getClass().getClassLoader());
+		ClassLoader loader = new LaunchedURLClassLoader(urls.toArray(NO_URLS), getClass().getClassLoader());
 		debug("Classpath: " + urls);
 		String customLoaderClassName = getProperty("loader.classLoader");
 		if (customLoaderClassName != null) {
@@ -350,22 +360,29 @@ public class PropertiesLauncher extends Launcher {
 	}
 
 	@SuppressWarnings("unchecked")
-	private ClassLoader wrapWithCustomClassLoader(ClassLoader parent, String loaderClassName) throws Exception {
-		Class<ClassLoader> loaderClass = (Class<ClassLoader>) Class.forName(loaderClassName, true, parent);
-
-		try {
-			return loaderClass.getConstructor(ClassLoader.class).newInstance(parent);
+	private ClassLoader wrapWithCustomClassLoader(ClassLoader parent, String className) throws Exception {
+		Class<ClassLoader> type = (Class<ClassLoader>) Class.forName(className, true, parent);
+		ClassLoader classLoader = newClassLoader(type, PARENT_ONLY_PARAMS, parent);
+		if (classLoader == null) {
+			classLoader = newClassLoader(type, URLS_AND_PARENT_PARAMS, NO_URLS, parent);
 		}
-		catch (NoSuchMethodException ex) {
-			// Ignore and try with URLs
+		if (classLoader == null) {
+			classLoader = newClassLoader(type, NO_PARAMS);
+		}
+		Assert.notNull(classLoader, "Unable to create class loader for " + className);
+		return classLoader;
 	}
+
+	private ClassLoader newClassLoader(Class<ClassLoader> loaderClass, Class<?>[] parameterTypes, Object... initargs)
+			throws Exception {
 		try {
-			return loaderClass.getConstructor(URL[].class, ClassLoader.class).newInstance(new URL[0], parent);
+			Constructor<ClassLoader> constructor = loaderClass.getDeclaredConstructor(parameterTypes);
+			constructor.setAccessible(true);
+			return constructor.newInstance(initargs);
 		}
 		catch (NoSuchMethodException ex) {
-			// Ignore and try without any arguments
+			return null;
 		}
-		return loaderClass.newInstance();
 	}
 
 	private String getProperty(String propertyKey) throws Exception {

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/PropertiesLauncherTests.java

@@ -360,7 +360,7 @@ class PropertiesLauncherTests {
 
 	public static class TestLoader extends URLClassLoader {
 
-		public TestLoader(ClassLoader parent) {
+		TestLoader(ClassLoader parent) {
 			super(new URL[0], parent);
 		}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/ConfigurationPropertiesBeanRegistrarTests.java

@@ -125,8 +125,7 @@ class ConfigurationPropertiesBeanRegistrarTests {
 	@ConfigurationProperties(prefix = "bar")
 	public static class BarProperties {
 
-		public BarProperties(String foo) {
-
+		BarProperties(String foo) {
 		}
 
 	}
@@ -134,12 +133,10 @@ class ConfigurationPropertiesBeanRegistrarTests {
 	@ConfigurationProperties(prefix = "bing")
 	public static class BingProperties {
 
-		public BingProperties() {
-
+		BingProperties() {
 		}
 
-		public BingProperties(String foo) {
-
+		BingProperties(String foo) {
 		}
 
 	}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/CollectionBinderTests.java

@@ -470,7 +470,7 @@ class CollectionBinderTests {
 
 	public static class MyCustomNoDefaultConstructorList extends ArrayList<String> {
 
-		public MyCustomNoDefaultConstructorList(List<String> items) {
+		MyCustomNoDefaultConstructorList(List<String> items) {
 			addAll(items);
 		}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/ConstructorParametersBinderTests.java

@@ -149,7 +149,7 @@ class ConstructorParametersBinderTests {
 
 		private final ExampleEnum enumValue;
 
-		public ExampleValueBean(int intValue, long longValue, boolean booleanValue, String stringValue,
+		ExampleValueBean(int intValue, long longValue, boolean booleanValue, String stringValue,
 				ExampleEnum enumValue) {
 			this.intValue = intValue;
 			this.longValue = longValue;
@@ -191,11 +191,11 @@ class ConstructorParametersBinderTests {
 	@SuppressWarnings("unused")
 	public static class MultipleConstructorsBean {
 
-		public MultipleConstructorsBean(int intValue) {
+		MultipleConstructorsBean(int intValue) {
 			this(intValue, 23L, "hello");
 		}
 
-		public MultipleConstructorsBean(int intValue, long longValue, String stringValue) {
+		MultipleConstructorsBean(int intValue, long longValue, String stringValue) {
 		}
 
 	}
@@ -204,7 +204,7 @@ class ConstructorParametersBinderTests {
 
 		private final String name;
 
-		public ExampleAbstractBean(String name) {
+		ExampleAbstractBean(String name) {
 			this.name = name;
 		}
 
@@ -216,8 +216,7 @@ class ConstructorParametersBinderTests {
 
 	public static class DefaultConstructorBean {
 
-		public DefaultConstructorBean() {
-
+		DefaultConstructorBean() {
 		}
 
 	}
@@ -226,7 +225,7 @@ class ConstructorParametersBinderTests {
 
 		private final ExampleValueBean valueBean;
 
-		public ExampleNestedBean(ExampleValueBean valueBean) {
+		ExampleNestedBean(ExampleValueBean valueBean) {
 			this.valueBean = valueBean;
 		}
 
@@ -244,7 +243,7 @@ class ConstructorParametersBinderTests {
 
 		private final List<String> customList;
 
-		public ExampleDefaultValueBean(@DefaultValue("5") int intValue,
+		ExampleDefaultValueBean(@DefaultValue("5") int intValue,
 				@DefaultValue({ "a", "b", "c" }) List<String> stringsList,
 				@DefaultValue("x,y,z") List<String> customList) {
 			this.intValue = intValue;

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/JavaBeanBinderTests.java

@@ -758,7 +758,7 @@ class JavaBeanBinderTests {
 
 		private String value;
 
-		public ExampleWithNonDefaultConstructor(String value) {
+		ExampleWithNonDefaultConstructor(String value) {
 			this.value = value;
 		}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/MapBinderTests.java

@@ -605,10 +605,10 @@ class MapBinderTests {
 
 		private String pattern;
 
-		public Foo() {
+		Foo() {
 		}
 
-		public Foo(String pattern) {
+		Foo(String pattern) {
 			this.pattern = pattern;
 		}
 
@@ -668,7 +668,7 @@ class MapBinderTests {
 
 	public static class MyCustomNoDefaultConstructorMap extends HashMap<String, String> {
 
-		public MyCustomNoDefaultConstructorMap(Map<String, String> items) {
+		MyCustomNoDefaultConstructorMap(Map<String, String> items) {
 			putAll(items);
 		}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/context/ServletWebServerMvcIntegrationTests.java

@@ -167,7 +167,7 @@ class ServletWebServerMvcIntegrationTests {
 
 		private final Environment env;
 
-		public AdvancedConfig(Environment env) {
+		AdvancedConfig(Environment env) {
 			this.env = env;
 		}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/support/SpringBootServletInitializerTests.java

@@ -193,7 +193,7 @@ class SpringBootServletInitializerTests {
 	@Configuration(proxyBeanMethods = false)
 	public static class WithErrorPageFilterNotRegistered extends SpringBootServletInitializer {
 
-		public WithErrorPageFilterNotRegistered() {
+		WithErrorPageFilterNotRegistered() {
 			setRegisterErrorPageFilter(false);
 		}
 

spring-boot-tests/spring-boot-integration-tests/spring-boot-server-tests/src/test/java/org/springframework/boot/context/embedded/EmbeddedServerContainerInvocationContextProvider.java

@@ -61,7 +61,7 @@ class EmbeddedServerContainerInvocationContextProvider
 
 	private final Path tempDir;
 
-	public EmbeddedServerContainerInvocationContextProvider() throws IOException {
+	EmbeddedServerContainerInvocationContextProvider() throws IOException {
 		this.tempDir = Files.createTempDirectory("embedded-servlet-container-tests");
 	}
 
@@ -99,7 +99,7 @@ class EmbeddedServerContainerInvocationContextProvider
 
 		private final AbstractApplicationLauncher launcher;
 
-		public EmbeddedServletContainerInvocationContext(String name, AbstractApplicationLauncher launcher) {
+		EmbeddedServletContainerInvocationContext(String name, AbstractApplicationLauncher launcher) {
 			this.name = name;
 			this.launcher = launcher;
 		}

src/checkstyle/checkstyle-suppressions.xml

@@ -3,7 +3,6 @@
 		"-//Checkstyle//DTD SuppressionFilter Configuration 1.2//EN"
 		"https://checkstyle.org/dtds/suppressions_1_2.dtd">
 <suppressions>
-	<suppress files="[\\/]src[\\/]test[\\/]" checks="RedundantModifier" />
 	<suppress files="SpringApplicationTests\.java" checks="FinalClass" />
 	<suppress files=".+Configuration\.java" checks="HideUtilityClassConstructor" />
 	<suppress files=".+Application\.java" checks="HideUtilityClassConstructor" />
@@ -38,4 +37,5 @@
 	<suppress files="RemoteUrlPropertyExtractorTests\.java" checks="IllegalImport" />
 	<suppress files="SampleLogbackApplication\.java" checks="IllegalImport" />
 	<suppress files="FlywayAutoConfigurationTests\.java" checks="IllegalImport" />
+	<suppress files="JerseyAutoConfigurationServletContainerTests" checks="RedundantModifier" />
 </suppressions>