Polish web.client exceptions and related classes

The following style updates have been made in anticipation of
substantive changes in subsequent commits:

 - organize imports
 - correct whitespace errors (leading spaces in code, tabs in Javadoc)
 - wrap Javadoc at 90 chars; make imperative ("Return" vs. "Returns")
 - use conventional constructor argument wrapping

A serialVersionUID has also been added to RestClientException and its
ResourceAccessException subclass for consistency with the rest of that
same exception hierarchy.

Issue: SPR-7938

spring-web/src/main/java/org/springframework/http/HttpHeaders.java

 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -17,9 +17,12 @@
 package org.springframework.http;
 
 import java.net.URI;
+
 import java.nio.charset.Charset;
+
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;

spring-web/src/main/java/org/springframework/web/client/DefaultResponseErrorHandler.java

 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -28,10 +28,11 @@ import org.springframework.util.FileCopyUtils;
 /**
  * Default implementation of the {@link ResponseErrorHandler} interface.
  *
- * <p>This error handler checks for the status code on the {@link ClientHttpResponse}: any code with series
- * {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR} or
- * {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR} is considered to be an error.
- * This behavior can be changed by overriding the {@link #hasError(HttpStatus)} method.
+ * <p>This error handler checks for the status code on the {@link ClientHttpResponse}: any
+ * code with series {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR} or
+ * {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR} is considered to be an
+ * error. This behavior can be changed by overriding the {@link #hasError(HttpStatus)}
+ * method.
  *
  * @author Arjen Poutsma
  * @since 3.0
@@ -83,15 +84,15 @@ public class DefaultResponseErrorHandler implements ResponseErrorHandler {
 
 	private byte[] getResponseBody(ClientHttpResponse response) {
 		try {
-            InputStream responseBody = response.getBody();
-            if (responseBody != null) {
-                return FileCopyUtils.copyToByteArray(responseBody);
-            }
+			InputStream responseBody = response.getBody();
+			if (responseBody != null) {
+				return FileCopyUtils.copyToByteArray(responseBody);
+			}
 		}
 		catch (IOException ex) {
-            // ignore
+			// ignore
 		}
-        return new byte[0];
+		return new byte[0];
 	}
 
 }

spring-web/src/main/java/org/springframework/web/client/HttpClientErrorException.java

@@ -31,8 +31,10 @@ public class HttpClientErrorException extends HttpStatusCodeException {
 
 	private static final long serialVersionUID = 6777393766937023392L;
 
+
 	/**
-	 * Construct a new instance of {@code HttpClientErrorException} based on a {@link HttpStatus}.
+	 * Construct a new instance of {@code HttpClientErrorException} based on an
+	 * {@link HttpStatus}.
 	 * @param statusCode the status code
 	 */
 	public HttpClientErrorException(HttpStatus statusCode) {
@@ -40,7 +42,8 @@ public class HttpClientErrorException extends HttpStatusCodeException {
 	}
 
 	/**
-	 * Construct a new instance of {@code HttpClientErrorException} based on a {@link HttpStatus} and status text.
+	 * Construct a new instance of {@code HttpClientErrorException} based on an
+	 * {@link HttpStatus} and status text.
 	 * @param statusCode the status code
 	 * @param statusText the status text
 	 */
@@ -49,18 +52,16 @@ public class HttpClientErrorException extends HttpStatusCodeException {
 	}
 
 	/**
-	 * Construct a new instance of {@code HttpClientErrorException} based on a {@link HttpStatus}, status text, and
-	 * response body content.
-	 *
-	 * @param statusCode	  the status code
-	 * @param statusText	  the status text
-	 * @param responseBody	the response body content, may be {@code null}
+	 * Construct a new instance of {@code HttpClientErrorException} based on an
+	 * {@link HttpStatus}, status text, and response body content.
+	 * @param statusCode the status code
+	 * @param statusText the status text
+	 * @param responseBody the response body content, may be {@code null}
 	 * @param responseCharset the response body charset, may be {@code null}
 	 */
-	public HttpClientErrorException(HttpStatus statusCode,
-			String statusText,
-			byte[] responseBody,
-			Charset responseCharset) {
+	public HttpClientErrorException(HttpStatus statusCode, String statusText,
+			byte[] responseBody, Charset responseCharset) {
 		super(statusCode, statusText, responseBody, responseCharset);
 	}
+
 }

spring-web/src/main/java/org/springframework/web/client/HttpServerErrorException.java

@@ -31,9 +31,10 @@ public class HttpServerErrorException extends HttpStatusCodeException {
 
 	private static final long serialVersionUID = -2565832100451369997L;
 
+
 	/**
-	 * Construct a new instance of {@code HttpServerErrorException} based on a {@link HttpStatus}.
-	 *
+	 * Construct a new instance of {@code HttpServerErrorException} based on an
+	 * {@link HttpStatus}.
 	 * @param statusCode the status code
 	 */
 	public HttpServerErrorException(HttpStatus statusCode) {
@@ -41,8 +42,8 @@ public class HttpServerErrorException extends HttpStatusCodeException {
 	}
 
 	/**
-	 * Construct a new instance of {@code HttpServerErrorException} based on a {@link HttpStatus} and status text.
-	 *
+	 * Construct a new instance of {@code HttpServerErrorException} based on an
+	 * {@link HttpStatus} and status text.
 	 * @param statusCode the status code
 	 * @param statusText the status text
 	 */
@@ -51,19 +52,17 @@ public class HttpServerErrorException extends HttpStatusCodeException {
 	}
 
 	/**
-	 * Construct a new instance of {@code HttpServerErrorException} based on a {@link HttpStatus}, status text, and
-	 * response body content.
-	 *
+	 * Construct a new instance of {@code HttpServerErrorException} based on an
+	 * {@link HttpStatus}, status text, and response body content.
 	 * @param statusCode	  the status code
 	 * @param statusText	  the status text
 	 * @param responseBody	the response body content, may be {@code null}
 	 * @param responseCharset the response body charset, may be {@code null}
 	 * @since 3.0.5
 	 */
-	public HttpServerErrorException(HttpStatus statusCode,
-			String statusText,
-			byte[] responseBody,
-			Charset responseCharset) {
+	public HttpServerErrorException(HttpStatus statusCode, String statusText,
+			byte[] responseBody, Charset responseCharset) {
 		super(statusCode, statusText, responseBody, responseCharset);
 	}
+
 }

spring-web/src/main/java/org/springframework/web/client/HttpStatusCodeException.java

@@ -42,9 +42,10 @@ public abstract class HttpStatusCodeException extends RestClientException {
 
 	private final String responseCharset;
 
+
 	/**
-	 * Construct a new instance of {@code HttpStatusCodeException} based on a {@link HttpStatus}.
-	 *
+	 * Construct a new instance of {@code HttpStatusCodeException} based on an
+	 * {@link HttpStatus}.
 	 * @param statusCode the status code
 	 */
 	protected HttpStatusCodeException(HttpStatus statusCode) {
@@ -52,8 +53,8 @@ public abstract class HttpStatusCodeException extends RestClientException {
 	}
 
 	/**
-	 * Construct a new instance of {@code HttpStatusCodeException} based on a {@link HttpStatus} and status text.
-	 *
+	 * Construct a new instance of {@code HttpStatusCodeException} based on an
+	 * {@link HttpStatus} and status text.
 	 * @param statusCode the status code
 	 * @param statusText the status text
 	 */
@@ -62,12 +63,11 @@ public abstract class HttpStatusCodeException extends RestClientException {
 	}
 
 	/**
-	 * Construct a new instance of {@code HttpStatusCodeException} based on a {@link HttpStatus}, status text, and
-	 * response body content.
-	 *
-	 * @param statusCode	  the status code
-	 * @param statusText	  the status text
-	 * @param responseBody	the response body content, may be {@code null}
+	 * Construct a new instance of {@code HttpStatusCodeException} based on an
+	 * {@link HttpStatus}, status text, and response body content.
+	 * @param statusCode the status code
+	 * @param statusText the status text
+	 * @param responseBody the response body content, may be {@code null}
 	 * @param responseCharset the response body charset, may be {@code null}
 	 * @since 3.0.5
 	 */
@@ -82,23 +82,23 @@ public abstract class HttpStatusCodeException extends RestClientException {
 		this.responseCharset = responseCharset != null ? responseCharset.name() : DEFAULT_CHARSET;
 	}
 
+
 	/**
-	 * Returns the HTTP status code.
+	 * Return the HTTP status code.
 	 */
 	public HttpStatus getStatusCode() {
 		return this.statusCode;
 	}
 
 	/**
-	 * Returns the HTTP status text.
+	 * Return the HTTP status text.
 	 */
 	public String getStatusText() {
 		return this.statusText;
 	}
 
 	/**
-	 * Returns the response body as a byte array.
-	 *
+	 * Return the response body as a byte array.
 	 * @since 3.0.5
 	 */
 	public byte[] getResponseBodyAsByteArray() {
@@ -106,8 +106,7 @@ public abstract class HttpStatusCodeException extends RestClientException {
 	}
 
 	/**
-	 * Returns the response body as a string.
-	 *
+	 * Return the response body as a string.
 	 * @since 3.0.5
 	 */
 	public String getResponseBodyAsString() {
@@ -119,4 +118,5 @@ public abstract class HttpStatusCodeException extends RestClientException {
 			throw new InternalError(ex.getMessage());
 		}
 	}
+
 }

spring-web/src/main/java/org/springframework/web/client/ResourceAccessException.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -26,6 +26,9 @@ import java.io.IOException;
  */
 public class ResourceAccessException extends RestClientException {
 
+	private static final long serialVersionUID = -8513182514355844870L;
+
+
 	/**
 	 * Construct a new {@code HttpIOException} with the given message.
 	 * @param msg the message

spring-web/src/main/java/org/springframework/web/client/RestClientException.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -19,13 +19,17 @@ package org.springframework.web.client;
 import org.springframework.core.NestedRuntimeException;
 
 /**
- * Base class for exceptions thrown by {@link RestTemplate} whenever it encounters client-side HTTP errors.
+ * Base class for exceptions thrown by {@link RestTemplate} whenever it encounters
+ * client-side HTTP errors.
  *
  * @author Arjen Poutsma
  * @since 3.0
  */
 public class RestClientException extends NestedRuntimeException {
 
+	private static final long serialVersionUID = -4084444984163796577L;
+
+
 	/**
 	 * Construct a new instance of {@code HttpClientException} with the given message.
 	 * @param msg the message
@@ -35,7 +39,8 @@ public class RestClientException extends NestedRuntimeException {
 	}
 
 	/**
-	 * Construct a new instance of {@code HttpClientException} with the given message and exception.
+	 * Construct a new instance of {@code HttpClientException} with the given message and
+	 * exception.
 	 * @param msg the message
 	 * @param ex the exception
 	 */

spring-web/src/test/java/org/springframework/web/client/DefaultResponseErrorHandlerTests.java

 /*
- * Copyright 2002-2011 the original author or authors.
+ * Copyright 2002-2012 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.
@@ -19,19 +19,23 @@ package org.springframework.web.client;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 
+import org.junit.Before;
+import org.junit.Test;
+
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.http.client.ClientHttpResponse;
 
-import org.junit.Before;
-import org.junit.Test;
-
 import static org.easymock.EasyMock.*;
-import static org.junit.Assert.assertFalse;
-import static org.junit.Assert.assertTrue;
 
-/** @author Arjen Poutsma */
+import static org.junit.Assert.*;
+
+/**
+ * Unit tests for {@link DefaultResponseErrorHandler}.
+ *
+ * @author Arjen Poutsma
+ */
 public class DefaultResponseErrorHandlerTests {
 
 	private DefaultResponseErrorHandler handler;