Avoid Class.getPackage() in favor of plain Class.getName() checks

Fixes #22306

spring-web/src/main/java/org/springframework/http/codec/DecoderHttpMessageReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -61,15 +61,14 @@ public class DecoderHttpMessageReader<T> implements HttpMessageReader<T> {
 	 */
 	public DecoderHttpMessageReader(Decoder<T> decoder) {
 		Assert.notNull(decoder, "Decoder is required");
+		initLogger(decoder);
 		this.decoder = decoder;
 		this.mediaTypes = MediaType.asMediaTypes(decoder.getDecodableMimeTypes());
-		initLogger(decoder);
 	}
 
-	private void initLogger(Decoder<T> decoder) {
+	private static void initLogger(Decoder<?> decoder) {
 		if (decoder instanceof AbstractDecoder &&
-				decoder.getClass().getPackage().getName().startsWith("org.springframework.core.codec")) {
-
+				decoder.getClass().getName().startsWith("org.springframework.core.codec")) {
 			Log logger = HttpLogging.forLog(((AbstractDecoder) decoder).getLogger());
 			((AbstractDecoder) decoder).setLogger(logger);
 		}

spring-web/src/main/java/org/springframework/http/codec/EncoderHttpMessageWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -67,16 +67,15 @@ public class EncoderHttpMessageWriter<T> implements HttpMessageWriter<T> {
 	 */
 	public EncoderHttpMessageWriter(Encoder<T> encoder) {
 		Assert.notNull(encoder, "Encoder is required");
+		initLogger(encoder);
 		this.encoder = encoder;
 		this.mediaTypes = MediaType.asMediaTypes(encoder.getEncodableMimeTypes());
 		this.defaultMediaType = initDefaultMediaType(this.mediaTypes);
-		initLogger(encoder);
 	}
 
-	private void initLogger(Encoder<T> encoder) {
+	private static void initLogger(Encoder<?> encoder) {
 		if (encoder instanceof AbstractEncoder &&
-				encoder.getClass().getPackage().getName().startsWith("org.springframework.core.codec")) {
-
+				encoder.getClass().getName().startsWith("org.springframework.core.codec")) {
 			Log logger = HttpLogging.forLog(((AbstractEncoder) encoder).getLogger());
 			((AbstractEncoder) encoder).setLogger(logger);
 		}

spring-webflux/src/main/java/org/springframework/web/reactive/result/method/AbstractHandlerMethodMapping.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -215,15 +215,12 @@ public abstract class AbstractHandlerMethodMapping<T> extends AbstractHandlerMap
 	}
 
 	private String formatMappings(Class<?> userType, Map<Method, T> methods) {
-
-		String formattedType = Arrays.stream(userType.getPackage().getName().split("\\."))
+		String formattedType = Arrays.stream(ClassUtils.getPackageName(userType).split("\\."))
 				.map(p -> p.substring(0, 1))
 				.collect(Collectors.joining(".", "", ".")) + userType.getSimpleName();
-
 		Function<Method, String> methodFormatter = method -> Arrays.stream(method.getParameterTypes())
 				.map(Class::getSimpleName)
 				.collect(Collectors.joining(",", "(", ")"));
-
 		return methods.entrySet().stream()
 				.map(e -> {
 					Method method = e.getKey();

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractHandlerMethodMapping.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 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.
@@ -285,15 +285,12 @@ public abstract class AbstractHandlerMethodMapping<T> extends AbstractHandlerMap
 	}
 
 	private String formatMappings(Class<?> userType, Map<Method, T> methods) {
-
-		String formattedType = Arrays.stream(userType.getPackage().getName().split("\\."))
+		String formattedType = Arrays.stream(ClassUtils.getPackageName(userType).split("\\."))
 				.map(p -> p.substring(0, 1))
 				.collect(Collectors.joining(".", "", ".")) + userType.getSimpleName();
-
 		Function<Method, String> methodFormatter = method -> Arrays.stream(method.getParameterTypes())
 				.map(Class::getSimpleName)
 				.collect(Collectors.joining(",", "(", ")"));
-
 		return methods.entrySet().stream()
 				.map(e -> {
 					Method method = e.getKey();