Replace Collections.sort() with direct sort call

Replace existing `Collections.sort(...)` calls with `.sort(...)`
directly on the collection instance.

See gh-9781

spring-boot/src/main/java/org/springframework/boot/SpringApplication.java

@@ -1309,7 +1309,7 @@ public class SpringApplication {
 	private static <E> Set<E> asUnmodifiableOrderedSet(Collection<E> elements) {
 		List<E> list = new ArrayList<>();
 		list.addAll(elements);
-		Collections.sort(list, AnnotationAwareOrderComparator.INSTANCE);
+		list.sort(AnnotationAwareOrderComparator.INSTANCE);
 		return new LinkedHashSet<>(list);
 	}
 

spring-boot/src/main/java/org/springframework/boot/context/config/DelegatingApplicationContextInitializer.java

@@ -17,7 +17,6 @@
 package org.springframework.boot.context.config;
 
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 
 import org.springframework.beans.BeanUtils;
@@ -110,7 +109,7 @@ public class DelegatingApplicationContextInitializer implements
 	@SuppressWarnings({ "unchecked", "rawtypes" })
 	private void applyInitializers(ConfigurableApplicationContext context,
 			List<ApplicationContextInitializer<?>> initializers) {
-		Collections.sort(initializers, new AnnotationAwareOrderComparator());
+		initializers.sort(new AnnotationAwareOrderComparator());
 		for (ApplicationContextInitializer initializer : initializers) {
 			initializer.initialize(context);
 		}

spring-boot/src/main/java/org/springframework/boot/logging/java/JavaLoggingSystem.java

@@ -133,7 +133,7 @@ public class JavaLoggingSystem extends AbstractLoggingSystem {
 		while (names.hasMoreElements()) {
 			result.add(getLoggerConfiguration(names.nextElement()));
 		}
-		Collections.sort(result, CONFIGURATION_COMPARATOR);
+		result.sort(CONFIGURATION_COMPARATOR);
 		return Collections.unmodifiableList(result);
 	}
 

spring-boot/src/main/java/org/springframework/boot/logging/log4j2/Log4J2LoggingSystem.java

@@ -220,7 +220,7 @@ public class Log4J2LoggingSystem extends Slf4JLoggingSystem {
 		for (LoggerConfig loggerConfig : configuration.getLoggers().values()) {
 			result.add(convertLoggerConfiguration(loggerConfig));
 		}
-		Collections.sort(result, CONFIGURATION_COMPARATOR);
+		result.sort(CONFIGURATION_COMPARATOR);
 		return result;
 	}
 

spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackLoggingSystem.java

@@ -20,7 +20,6 @@ import java.net.URL;
 import java.security.CodeSource;
 import java.security.ProtectionDomain;
 import java.util.ArrayList;
-import java.util.Collections;
 import java.util.List;
 import java.util.Set;
 
@@ -213,7 +212,7 @@ public class LogbackLoggingSystem extends Slf4JLoggingSystem {
 		for (ch.qos.logback.classic.Logger logger : getLoggerContext().getLoggerList()) {
 			result.add(getLoggerConfiguration(logger));
 		}
-		Collections.sort(result, CONFIGURATION_COMPARATOR);
+		result.sort(CONFIGURATION_COMPARATOR);
 		return result;
 	}
 

spring-boot/src/main/java/org/springframework/boot/web/server/ErrorPageRegistrarBeanPostProcessor.java

@@ -78,7 +78,7 @@ public class ErrorPageRegistrarBeanPostProcessor
 			// Look up does not include the parent context
 			this.registrars = new ArrayList<>(this.beanFactory
 					.getBeansOfType(ErrorPageRegistrar.class, false, false).values());
-			Collections.sort(this.registrars, AnnotationAwareOrderComparator.INSTANCE);
+			this.registrars.sort(AnnotationAwareOrderComparator.INSTANCE);
 			this.registrars = Collections.unmodifiableList(this.registrars);
 		}
 		return this.registrars;

spring-boot/src/main/java/org/springframework/boot/web/server/WebServerFactoryCustomizerBeanPostProcessor.java

@@ -114,7 +114,7 @@ public class WebServerFactoryCustomizerBeanPostProcessor
 		if (this.customizers == null) {
 			// Look up does not include the parent context
 			this.customizers = new ArrayList<>(getWebServerFactoryCustomizerBeans());
-			Collections.sort(this.customizers, AnnotationAwareOrderComparator.INSTANCE);
+			this.customizers.sort(AnnotationAwareOrderComparator.INSTANCE);
 			this.customizers = Collections.unmodifiableList(this.customizers);
 		}
 		return this.customizers;

spring-boot/src/main/java/org/springframework/boot/web/servlet/ServletContextInitializerBeans.java

@@ -238,7 +238,7 @@ public class ServletContextInitializerBeans
 			}
 		}
 		beans.addAll(map.entrySet());
-		Collections.sort(beans, comparator);
+		beans.sort(comparator);
 		return beans;
 	}