Polish: follow name convention - make immutable fields final

spring-aop/src/main/java/org/springframework/aop/aspectj/annotation/InstantiationModelAwarePointcutAdvisorImpl.java

@@ -45,7 +45,7 @@ import org.springframework.lang.Nullable;
 class InstantiationModelAwarePointcutAdvisorImpl
 		implements InstantiationModelAwarePointcutAdvisor, AspectJPrecedenceInformation, Serializable {
 
-	private static Advice EMPTY_ADVICE = new Advice() {};
+	private static final Advice EMPTY_ADVICE = new Advice() {};
 
 
 	private final AspectJExpressionPointcut declaredPointcut;

spring-aop/src/main/java/org/springframework/aop/support/Pointcuts.java

@@ -95,7 +95,7 @@ public abstract class Pointcuts {
 	@SuppressWarnings("serial")
 	private static class SetterPointcut extends StaticMethodMatcherPointcut implements Serializable {
 
-		public static SetterPointcut INSTANCE = new SetterPointcut();
+		public static final SetterPointcut INSTANCE = new SetterPointcut();
 
 		@Override
 		public boolean matches(Method method, @Nullable Class<?> targetClass) {
@@ -116,7 +116,7 @@ public abstract class Pointcuts {
 	@SuppressWarnings("serial")
 	private static class GetterPointcut extends StaticMethodMatcherPointcut implements Serializable {
 
-		public static GetterPointcut INSTANCE = new GetterPointcut();
+		public static final GetterPointcut INSTANCE = new GetterPointcut();
 
 		@Override
 		public boolean matches(Method method, @Nullable Class<?> targetClass) {

spring-beans/src/main/java/org/springframework/beans/factory/support/AutowireCandidateQualifier.java

@@ -32,7 +32,7 @@ import org.springframework.util.Assert;
 @SuppressWarnings("serial")
 public class AutowireCandidateQualifier extends BeanMetadataAttributeAccessor {
 
-	public static String VALUE_KEY = "value";
+	public static final String VALUE_KEY = "value";
 
 	private final String typeName;
 

spring-core/src/main/java/org/springframework/core/io/VfsUtils.java

@@ -47,24 +47,24 @@ public abstract class VfsUtils {
 	private static final String VFS3_PKG = "org.jboss.vfs.";
 	private static final String VFS_NAME = "VFS";
 
-	private static Method VFS_METHOD_GET_ROOT_URL;
-	private static Method VFS_METHOD_GET_ROOT_URI;
+	private static final Method VFS_METHOD_GET_ROOT_URL;
+	private static final Method VFS_METHOD_GET_ROOT_URI;
 
-	private static Method VIRTUAL_FILE_METHOD_EXISTS;
-	private static Method VIRTUAL_FILE_METHOD_GET_INPUT_STREAM;
-	private static Method VIRTUAL_FILE_METHOD_GET_SIZE;
-	private static Method VIRTUAL_FILE_METHOD_GET_LAST_MODIFIED;
-	private static Method VIRTUAL_FILE_METHOD_TO_URL;
-	private static Method VIRTUAL_FILE_METHOD_TO_URI;
-	private static Method VIRTUAL_FILE_METHOD_GET_NAME;
-	private static Method VIRTUAL_FILE_METHOD_GET_PATH_NAME;
-	private static Method VIRTUAL_FILE_METHOD_GET_CHILD;
+	private static final Method VIRTUAL_FILE_METHOD_EXISTS;
+	private static final Method VIRTUAL_FILE_METHOD_GET_INPUT_STREAM;
+	private static final Method VIRTUAL_FILE_METHOD_GET_SIZE;
+	private static final Method VIRTUAL_FILE_METHOD_GET_LAST_MODIFIED;
+	private static final Method VIRTUAL_FILE_METHOD_TO_URL;
+	private static final Method VIRTUAL_FILE_METHOD_TO_URI;
+	private static final Method VIRTUAL_FILE_METHOD_GET_NAME;
+	private static final Method VIRTUAL_FILE_METHOD_GET_PATH_NAME;
+	private static final Method VIRTUAL_FILE_METHOD_GET_CHILD;
 
-	protected static Class<?> VIRTUAL_FILE_VISITOR_INTERFACE;
-	protected static Method VIRTUAL_FILE_METHOD_VISIT;
+	protected static final Class<?> VIRTUAL_FILE_VISITOR_INTERFACE;
+	protected static final Method VIRTUAL_FILE_METHOD_VISIT;
 
-	private static Field VISITOR_ATTRIBUTES_FIELD_RECURSE;
-	private static Method GET_PHYSICAL_FILE;
+	private static final Field VISITOR_ATTRIBUTES_FIELD_RECURSE;
+	private static final Method GET_PHYSICAL_FILE;
 
 	static {
 		ClassLoader loader = VfsUtils.class.getClassLoader();

spring-expression/src/main/java/org/springframework/expression/spel/ast/Operator.java

@@ -238,9 +238,9 @@ public abstract class Operator extends SpelNodeImpl {
 	 */
 	protected static class DescriptorComparison {
 
-		static DescriptorComparison NOT_NUMBERS = new DescriptorComparison(false, false, ' ');
+		static final DescriptorComparison NOT_NUMBERS = new DescriptorComparison(false, false, ' ');
 
-		static DescriptorComparison INCOMPATIBLE_NUMBERS = new DescriptorComparison(true, false, ' ');
+		static final DescriptorComparison INCOMPATIBLE_NUMBERS = new DescriptorComparison(true, false, ' ');
 
 		final boolean areNumbers;  // Were the two compared descriptor both for numbers?
 

spring-expression/src/main/java/org/springframework/expression/spel/ast/SpelNodeImpl.java

@@ -44,7 +44,7 @@ import org.springframework.util.ObjectUtils;
  */
 public abstract class SpelNodeImpl implements SpelNode, Opcodes {
 
-	private static SpelNodeImpl[] NO_CHILDREN = new SpelNodeImpl[0];
+	private static final SpelNodeImpl[] NO_CHILDREN = new SpelNodeImpl[0];
 
 
 	protected int pos;  // start = top 16bits, end = bottom 16bits

spring-jdbc/src/main/java/org/springframework/jdbc/object/BatchSqlUpdate.java

@@ -48,7 +48,7 @@ public class BatchSqlUpdate extends SqlUpdate {
 	/**
 	 * Default number of inserts to accumulate before commiting a batch (5000).
 	 */
-	public static int DEFAULT_BATCH_SIZE = 5000;
+	public static final int DEFAULT_BATCH_SIZE = 5000;
 
 
 	private int batchSize = DEFAULT_BATCH_SIZE;

spring-jms/src/main/java/org/springframework/jms/support/SimpleJmsHeaderMapper.java

@@ -55,7 +55,7 @@ import org.springframework.util.StringUtils;
  */
 public class SimpleJmsHeaderMapper extends AbstractHeaderMapper<Message> implements JmsHeaderMapper {
 
-	private static Set<Class<?>> SUPPORTED_PROPERTY_TYPES = new HashSet<>(Arrays.asList(new Class<?>[] {
+	private static final Set<Class<?>> SUPPORTED_PROPERTY_TYPES = new HashSet<>(Arrays.asList(new Class<?>[] {
 			Boolean.class, Byte.class, Double.class, Float.class, Integer.class, Long.class, Short.class, String.class}));
 
 

spring-messaging/src/main/java/org/springframework/messaging/simp/broker/AbstractSubscriptionRegistry.java

@@ -37,7 +37,7 @@ import org.springframework.util.MultiValueMap;
  */
 public abstract class AbstractSubscriptionRegistry implements SubscriptionRegistry {
 
-	private static MultiValueMap<String, String> EMPTY_MAP =
+	private static final MultiValueMap<String, String> EMPTY_MAP =
 			CollectionUtils.unmodifiableMultiValueMap(new LinkedMultiValueMap<>(0));
 
 	protected final Log logger = LogFactory.getLog(getClass());

spring-test/src/main/java/org/springframework/test/web/servlet/MockMvc.java

@@ -65,7 +65,7 @@ import org.springframework.web.context.request.ServletRequestAttributes;
  */
 public final class MockMvc {
 
-	static String MVC_RESULT_ATTRIBUTE = MockMvc.class.getName().concat(".MVC_RESULT_ATTRIBUTE");
+	static final String MVC_RESULT_ATTRIBUTE = MockMvc.class.getName().concat(".MVC_RESULT_ATTRIBUTE");
 
 	private final TestDispatcherServlet servlet;
 

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

@@ -35,7 +35,7 @@ import org.springframework.util.Assert;
  */
 public class ServletServerHttpAsyncRequestControl implements ServerHttpAsyncRequestControl, AsyncListener {
 
-	private static long NO_TIMEOUT_VALUE = Long.MIN_VALUE;
+	private static final long NO_TIMEOUT_VALUE = Long.MIN_VALUE;
 
 
 	private final ServletServerHttpRequest request;

spring-web/src/main/java/org/springframework/web/context/request/ServletWebRequest.java

@@ -78,7 +78,7 @@ public class ServletWebRequest extends ServletRequestAttributes implements Nativ
 			"EEE MMM dd HH:mm:ss yyyy"
 	};
 
-	private static TimeZone GMT = TimeZone.getTimeZone("GMT");
+	private static final TimeZone GMT = TimeZone.getTimeZone("GMT");
 
 	private boolean notModified = false;
 

spring-websocket/src/main/java/org/springframework/web/socket/messaging/StompSubProtocolErrorHandler.java

@@ -32,7 +32,7 @@ import org.springframework.util.Assert;
  */
 public class StompSubProtocolErrorHandler implements SubProtocolErrorHandler<byte[]> {
 
-	private static byte[] EMPTY_PAYLOAD = new byte[0];
+	private static final byte[] EMPTY_PAYLOAD = new byte[0];
 
 
 	@Override