Use consistent class design

Update all classes so that inner classes are always last. Also
ensure that utility classes are always final and have a private
constructor and make exceptions final whenever possible.

Issue: SPR-16968

spring-test/src/main/java/org/springframework/mock/http/server/reactive/MockServerHttpRequest.java

@@ -52,7 +52,7 @@ import org.springframework.web.util.UriComponentsBuilder;
  * @author Rossen Stoyanchev
  * @since 5.0
  */
-public class MockServerHttpRequest extends AbstractServerHttpRequest {
+public final class MockServerHttpRequest extends AbstractServerHttpRequest {
 
 	private final HttpMethod httpMethod;
 

spring-test/src/main/java/org/springframework/mock/jndi/SimpleNamingContext.java

@@ -357,7 +357,7 @@ public class SimpleNamingContext implements Context {
 	}
 
 
-	private static class NameClassPairEnumeration extends AbstractNamingEnumeration<NameClassPair> {
+	private static final class NameClassPairEnumeration extends AbstractNamingEnumeration<NameClassPair> {
 
 		private NameClassPairEnumeration(SimpleNamingContext context, String root) throws NamingException {
 			super(context, root);
@@ -370,7 +370,7 @@ public class SimpleNamingContext implements Context {
 	}
 
 
-	private static class BindingEnumeration extends AbstractNamingEnumeration<Binding> {
+	private static final class BindingEnumeration extends AbstractNamingEnumeration<Binding> {
 
 		private BindingEnumeration(SimpleNamingContext context, String root) throws NamingException {
 			super(context, root);

spring-test/src/main/java/org/springframework/mock/web/MockFilterChain.java

@@ -150,7 +150,7 @@ public class MockFilterChain implements FilterChain {
 	/**
 	 * A filter that simply delegates to a Servlet.
 	 */
-	private static class ServletFilterProxy implements Filter {
+	private static final class ServletFilterProxy implements Filter {
 
 		private final Servlet delegateServlet;
 

spring-test/src/main/java/org/springframework/mock/web/reactive/function/server/MockServerRequest.java

@@ -63,7 +63,7 @@ import org.springframework.web.util.UriComponentsBuilder;
  * @author Arjen Poutsma
  * @since 5.0
  */
-public class MockServerRequest implements ServerRequest {
+public final class MockServerRequest implements ServerRequest {
 
 	private final HttpMethod method;
 

spring-test/src/main/java/org/springframework/test/annotation/SystemProfileValueSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -26,7 +26,7 @@ import org.springframework.util.Assert;
  * @author Sam Brannen
  * @since 2.0
  */
-public class SystemProfileValueSource implements ProfileValueSource {
+public final class SystemProfileValueSource implements ProfileValueSource {
 
 	private static final SystemProfileValueSource INSTANCE = new SystemProfileValueSource();
 

spring-test/src/main/java/org/springframework/test/annotation/TestAnnotationUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -26,7 +26,12 @@ import org.springframework.core.annotation.AnnotatedElementUtils;
  * @author Sam Brannen
  * @since 4.2
  */
-public class TestAnnotationUtils {
+public final class TestAnnotationUtils {
+
+
+	private TestAnnotationUtils() {
+	}
+
 
 	/**
 	 * Get the {@code timeout} configured via the {@link Timed @Timed}

spring-test/src/main/java/org/springframework/test/context/transaction/TestTransaction.java

@@ -38,7 +38,12 @@ import org.springframework.util.Assert;
  * @since 4.1
  * @see TransactionalTestExecutionListener
  */
-public class TestTransaction {
+public final class TestTransaction {
+
+
+	private TestTransaction() {
+	}
+
 
 	/**
 	 * Determine whether a test-managed transaction is currently <em>active</em>.

spring-test/src/main/java/org/springframework/test/context/transaction/TransactionContextHolder.java

@@ -25,12 +25,16 @@ import org.springframework.lang.Nullable;
  * @author Sam Brannen
  * @since 4.1
  */
-class TransactionContextHolder {
+final class TransactionContextHolder {
 
 	private static final ThreadLocal<TransactionContext> currentTransactionContext =
 			new NamedInheritableThreadLocal<>("Test Transaction Context");
 
 
+	private TransactionContextHolder() {
+	}
+
+
 	static void setCurrentTransactionContext(TransactionContext transactionContext) {
 		currentTransactionContext.set(transactionContext);
 	}

spring-test/src/main/java/org/springframework/test/jdbc/JdbcTestUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -38,11 +38,15 @@ import org.springframework.util.StringUtils;
  * @see org.springframework.jdbc.datasource.init.ResourceDatabasePopulator
  * @see org.springframework.jdbc.datasource.init.DatabasePopulatorUtils
  */
-public class JdbcTestUtils {
+public final class JdbcTestUtils {
 
 	private static final Log logger = LogFactory.getLog(JdbcTestUtils.class);
 
 
+	private JdbcTestUtils() {
+	}
+
+
 	/**
 	 * Count the rows in the given table.
 	 * @param jdbcTemplate the JdbcTemplate with which to perform JDBC operations

spring-test/src/main/java/org/springframework/test/web/client/ExpectedCount.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -38,7 +38,7 @@ import org.springframework.util.Assert;
  * @author Rossen Stoyanchev
  * @since 4.3
  */
-public class ExpectedCount {
+public final class ExpectedCount {
 
 	private final int minCount;
 

spring-test/src/main/java/org/springframework/test/web/client/MockRestServiceServer.java

@@ -64,7 +64,7 @@ import org.springframework.web.client.support.RestGatewaySupport;
  * @since 3.2
  */
 @SuppressWarnings("deprecation")
-public class MockRestServiceServer {
+public final class MockRestServiceServer {
 
 	private final RequestExpectationManager expectationManager;
 

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

@@ -33,7 +33,12 @@ import org.springframework.web.context.WebApplicationContext;
  * @see #webAppContextSetup(WebApplicationContext)
  * @see #standaloneSetup(Object...)
  */
-public class MockMvcBuilders {
+public final class MockMvcBuilders {
+
+
+	private MockMvcBuilders() {
+	}
+
 
 	/**
 	 * Build a {@link MockMvc} instance using the given, fully initialized