RequireThis rule and fixThis Gradle task

* `gradlew clean check -x test --parallel --continue` - to collect reports
* `gradlew fixThis --parallel` - to fix all possible vulnerabilities. With `-Dfile.encoding=UTF-8` on Windows

Since the `RequireThisCheck` doesn't see parents for anonymous classes (e.g. `Runnable` callback), its report doesn't contains the outer class name with `this.`,
therefore we still have to fix those cases manually.
Thanks to the wrong `replacer` just with `this.` we have uncompilable code enough easy to find problems.
Not so easy to fix for good readability though...

* Upgrade to Grade 2.12
* Upgrade to SonarQube native plugin

The fix contains at about 300 files. So, will be done on merge.

Fix `fixThis.gradle` according PR comments

Apply `fixThis` and also `fixModifiers` for test classes.
 Fix some `this.` inner issues manually.
 Make code polishing for long lines after `fixThis`

Fix conflicts and vulnerabilities after the rebase

spring-integration-http/src/main/java/org/springframework/integration/http/inbound/CrossOrigin.java

@@ -47,7 +47,7 @@ public class CrossOrigin {
 	}
 
 	public String[] getOrigin() {
-		return origin;
+		return this.origin;
 	}
 
 	public void setAllowedHeaders(String... allowedHeaders) {
@@ -55,7 +55,7 @@ public class CrossOrigin {
 	}
 
 	public String[] getAllowedHeaders() {
-		return allowedHeaders;
+		return this.allowedHeaders;
 	}
 
 	public void setExposedHeaders(String... exposedHeaders) {
@@ -63,7 +63,7 @@ public class CrossOrigin {
 	}
 
 	public String[] getExposedHeaders() {
-		return exposedHeaders;
+		return this.exposedHeaders;
 	}
 
 	public void setMethod(RequestMethod... method) {
@@ -71,7 +71,7 @@ public class CrossOrigin {
 	}
 
 	public RequestMethod[] getMethod() {
-		return method;
+		return this.method;
 	}
 
 	public void setAllowCredentials(Boolean allowCredentials) {
@@ -79,7 +79,7 @@ public class CrossOrigin {
 	}
 
 	public Boolean getAllowCredentials() {
-		return allowCredentials;
+		return this.allowCredentials;
 	}
 
 	public void setMaxAge(long maxAge) {
@@ -87,7 +87,7 @@ public class CrossOrigin {
 	}
 
 	public long getMaxAge() {
-		return maxAge;
+		return this.maxAge;
 	}
 
 }

spring-integration-http/src/main/java/org/springframework/integration/http/inbound/HttpRequestHandlingController.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -182,10 +182,10 @@ public class HttpRequestHandlingController extends HttpRequestHandlingEndpointSu
 			MapBindingResult errors = new MapBindingResult(new HashMap<String, Object>(), "dummy");
 			PrintWriter stackTrace = new PrintWriter(new StringWriter());
 			e.printStackTrace(stackTrace);
-			errors.reject(errorCode, new Object[] { e, e.getMessage(), stackTrace.toString() },
+			errors.reject(this.errorCode, new Object[] { e, e.getMessage(), stackTrace.toString() },
 					"A Spring Integration handler raised an exception while handling an HTTP request.  The exception is of type "
 							+ e.getClass() + " and it has a message: (" + e.getMessage() + ")");
-			modelAndView.addObject(errorsKey, errors);
+			modelAndView.addObject(this.errorsKey, errors);
 		}
 		return modelAndView;
 	}

spring-integration-http/src/main/java/org/springframework/integration/http/inbound/HttpRequestHandlingEndpointSupport.java

@@ -195,7 +195,7 @@ public abstract class HttpRequestHandlingEndpointSupport extends MessagingGatewa
 	 * @return Whether to expect a reply.
 	 */
 	protected boolean isExpectReply() {
-		return expectReply;
+		return this.expectReply;
 	}
 
 	/**
@@ -283,7 +283,7 @@ public abstract class HttpRequestHandlingEndpointSupport extends MessagingGatewa
 	}
 
 	public final RequestMapping getRequestMapping() {
-		return requestMapping;
+		return this.requestMapping;
 	}
 
 
@@ -297,7 +297,7 @@ public abstract class HttpRequestHandlingEndpointSupport extends MessagingGatewa
 	}
 
 	public CrossOrigin getCrossOrigin() {
-		return crossOrigin;
+		return this.crossOrigin;
 	}
 
 	/**

spring-integration-http/src/main/java/org/springframework/integration/http/inbound/RequestMapping.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2015 the original author or authors.
+ * Copyright 2013-2016 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.
@@ -51,7 +51,7 @@ public class RequestMapping {
 	}
 
 	public String[] getPathPatterns() {
-		return pathPatterns;
+		return this.pathPatterns;
 	}
 
 	public void setMethods(HttpMethod... supportedMethods) {
@@ -60,7 +60,7 @@ public class RequestMapping {
 	}
 
 	public HttpMethod[] getMethods() {
-		return methods;
+		return this.methods;
 	}
 
 	public void setParams(String... params) {
@@ -69,7 +69,7 @@ public class RequestMapping {
 	}
 
 	public String[] getParams() {
-		return params;
+		return this.params;
 	}
 
 	public void setHeaders(String... headers) {
@@ -78,7 +78,7 @@ public class RequestMapping {
 	}
 
 	public String[] getHeaders() {
-		return headers;
+		return this.headers;
 	}
 
 	public void setConsumes(String... consumes) {
@@ -87,7 +87,7 @@ public class RequestMapping {
 	}
 
 	public String[] getConsumes() {
-		return consumes;
+		return this.consumes;
 	}
 
 	public void setProduces(String... produces) {
@@ -96,7 +96,7 @@ public class RequestMapping {
 	}
 
 	public String[] getProduces() {
-		return produces;
+		return this.produces;
 	}
 
 	public RequestMethod[] getRequestMethods() {

spring-integration-http/src/main/java/org/springframework/integration/http/multipart/SimpleMultipartFileReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -53,7 +53,7 @@ public class SimpleMultipartFileReader implements MultipartFileReader<Object> {
 			MediaType contentType = MediaType.parseMediaType(multipartFile.getContentType());
 			Charset charset = contentType.getCharSet();
 			if (charset == null) {
-				charset = defaultCharset;
+				charset = this.defaultCharset;
 			}
 			return new String(multipartFile.getBytes(), charset.name());
 		}

spring-integration-http/src/main/java/org/springframework/integration/http/support/DefaultHttpHeaderMapper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2016 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.
@@ -400,7 +400,7 @@ public class DefaultHttpHeaderMapper implements HeaderMapper<HttpHeaders>, BeanF
 	public void fromHeaders(MessageHeaders headers, HttpHeaders target) {
 		if (logger.isDebugEnabled()) {
 			logger.debug(MessageFormat.format("outboundHeaderNames={0}",
-					CollectionUtils.arrayToList(outboundHeaderNames)));
+					CollectionUtils.arrayToList(this.outboundHeaderNames)));
 		}
 		for (Entry<String, Object> entry : headers.entrySet()) {
 			String name = entry.getKey();
@@ -434,7 +434,7 @@ public class DefaultHttpHeaderMapper implements HeaderMapper<HttpHeaders>, BeanF
 	public Map<String, Object> toHeaders(HttpHeaders source) {
 		if (logger.isDebugEnabled()) {
 			logger.debug(MessageFormat.format("inboundHeaderNames={0}",
-					CollectionUtils.arrayToList(inboundHeaderNames)));
+					CollectionUtils.arrayToList(this.inboundHeaderNames)));
 		}
 		Map<String, Object> target = new HashMap<String, Object>();
 		Set<String> headerNames = source.keySet();

spring-integration-http/src/test/java/org/springframework/integration/http/inbound/HttpRequestHandlingMessagingGatewayTests.java

@@ -427,7 +427,7 @@ public class HttpRequestHandlingMessagingGatewayTests extends AbstractHttpInboun
 
 	private static class TestHttpMessageConverter extends AbstractHttpMessageConverter<Exception> {
 
-		public TestHttpMessageConverter() {
+		TestHttpMessageConverter() {
 			setSupportedMediaTypes(Arrays.asList(MediaType.ALL));
 		}