Avoid creation of unnecessary logger instances in web request abstraction

Closes gh-25900

Author: jhoeller

spring-web/src/main/java/org/springframework/http/server/reactive/AbstractServerHttpRequest.java

@@ -22,11 +22,8 @@
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
-import org.apache.commons.logging.Log;
-
 import org.springframework.http.HttpCookie;
 import org.springframework.http.HttpHeaders;
-import org.springframework.http.HttpLogging;
 import org.springframework.http.server.RequestPath;
 import org.springframework.lang.Nullable;
 import org.springframework.util.CollectionUtils;
@@ -46,8 +43,6 @@ public abstract class AbstractServerHttpRequest implements ServerHttpRequest {
 	private static final Pattern QUERY_PATTERN = Pattern.compile("([^&=]+)(=?)([^&]+)?");
 
 
-	protected final Log logger = HttpLogging.forLogName(getClass());
-
 	private final URI uri;
 
 	private final RequestPath path;
@@ -156,10 +151,7 @@ private String decodeQueryParam(String value) {
 			return URLDecoder.decode(value, "UTF-8");
 		}
 		catch (UnsupportedEncodingException ex) {
-			if (logger.isWarnEnabled()) {
-				logger.warn(getLogPrefix() + "Could not decode query value [" + value + "] as 'UTF-8'. " +
-						"Falling back on default encoding: " + ex.getMessage());
-			}
+			// Should never happen but we got a platform default fallback anyway.
 			return URLDecoder.decode(value);
 		}
 	}

spring-web/src/main/java/org/springframework/http/server/reactive/AbstractServerHttpResponse.java

@@ -21,7 +21,6 @@
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Supplier;
 
-import org.apache.commons.logging.Log;
 import org.reactivestreams.Publisher;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
@@ -31,7 +30,6 @@
 import org.springframework.core.io.buffer.DataBufferUtils;
 import org.springframework.core.io.buffer.PooledDataBuffer;
 import org.springframework.http.HttpHeaders;
-import org.springframework.http.HttpLogging;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseCookie;
 import org.springframework.lang.Nullable;
@@ -59,8 +57,6 @@ public abstract class AbstractServerHttpResponse implements ServerHttpResponse {
 	 */
 	private enum State {NEW, COMMITTING, COMMIT_ACTION_FAILED, COMMITTED}
 
-	protected final Log logger = HttpLogging.forLogName(getClass());
-
 
 	private final DataBufferFactory dataBufferFactory;
 

spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpResponse.java

@@ -359,10 +359,7 @@ protected boolean write(DataBuffer dataBuffer) throws IOException {
 			if (ready && remaining > 0) {
 				// In case of IOException, onError handling should call discardData(DataBuffer)..
 				int written = writeToOutputStream(dataBuffer);
-				if (logger.isTraceEnabled()) {
-					logger.trace(getLogPrefix() + "Wrote " + written + " of " + remaining + " bytes");
-				}
-				else if (rsWriteLogger.isTraceEnabled()) {
+				if (rsWriteLogger.isTraceEnabled()) {
 					rsWriteLogger.trace(getLogPrefix() + "Wrote " + written + " of " + remaining + " bytes");
 				}
 				if (written == remaining) {

spring-web/src/main/java/org/springframework/http/server/reactive/UndertowServerHttpResponse.java

@@ -205,10 +205,7 @@ protected boolean write(DataBuffer dataBuffer) throws IOException {
 			int total = buffer.remaining();
 			int written = writeByteBuffer(buffer);
 
-			if (logger.isTraceEnabled()) {
-				logger.trace(getLogPrefix() + "Wrote " + written + " of " + total + " bytes");
-			}
-			else if (rsWriteLogger.isTraceEnabled()) {
+			if (rsWriteLogger.isTraceEnabled()) {
 				rsWriteLogger.trace(getLogPrefix() + "Wrote " + written + " of " + total + " bytes");
 			}
 			if (written != total) {

spring-web/src/main/java/org/springframework/web/method/HandlerMethod.java

@@ -35,6 +35,7 @@
 import org.springframework.core.annotation.AnnotatedElementUtils;
 import org.springframework.core.annotation.SynthesizingMethodParameter;
 import org.springframework.http.HttpStatus;
+import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.ClassUtils;
@@ -62,7 +63,7 @@
 public class HandlerMethod {
 
 	/** Logger that is available to subclasses. */
-	protected final Log logger = LogFactory.getLog(getClass());
+	protected static final Log logger = LogFactory.getLog(HandlerMethod.class);
 
 	private final Object bean;
 
@@ -473,6 +474,12 @@ protected HandlerMethodParameter(HandlerMethodParameter original) {
 			super(original);
 		}
 
+		@Override
+		@NonNull
+		public Method getMethod() {
+			return HandlerMethod.this.bridgedMethod;
+		}
+
 		@Override
 		public Class<?> getContainingClass() {
 			return HandlerMethod.this.getBeanType();

spring-web/src/main/java/org/springframework/web/method/support/HandlerMethodReturnValueHandlerComposite.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -20,24 +20,20 @@
 import java.util.Collections;
 import java.util.List;
 
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
 import org.springframework.core.MethodParameter;
 import org.springframework.lang.Nullable;
 import org.springframework.web.context.request.NativeWebRequest;
 
 /**
- * Handles method return values by delegating to a list of registered {@link HandlerMethodReturnValueHandler HandlerMethodReturnValueHandlers}.
+ * Handles method return values by delegating to a list of registered
+ * {@link HandlerMethodReturnValueHandler HandlerMethodReturnValueHandlers}.
  * Previously resolved return types are cached for faster lookups.
  *
  * @author Rossen Stoyanchev
  * @since 3.1
  */
 public class HandlerMethodReturnValueHandlerComposite implements HandlerMethodReturnValueHandler {
 
-	protected final Log logger = LogFactory.getLog(getClass());
-
 	private final List<HandlerMethodReturnValueHandler> returnValueHandlers = new ArrayList<>();