Fix precondition assertions

Author: sbrannen

spring-tx/src/main/java/org/springframework/transaction/reactive/TransactionalOperatorImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -57,7 +57,7 @@ final class TransactionalOperatorImpl implements TransactionalOperator {
 	 */
 	TransactionalOperatorImpl(ReactiveTransactionManager transactionManager, TransactionDefinition transactionDefinition) {
 		Assert.notNull(transactionManager, "ReactiveTransactionManager must not be null");
-		Assert.notNull(transactionManager, "TransactionDefinition must not be null");
+		Assert.notNull(transactionDefinition, "TransactionDefinition must not be null");
 		this.transactionManager = transactionManager;
 		this.transactionDefinition = transactionDefinition;
 	}

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

@@ -465,8 +465,9 @@ else if (!escaped && ch == '"') {
 	 * @see <a href="https://tools.ietf.org/html/rfc5987">RFC 5987</a>
 	 */
 	private static String decodeFilename(String filename, Charset charset) {
-		Assert.notNull(filename, "'input' String should not be null");
-		Assert.notNull(charset, "'charset' should not be null");
+		Assert.notNull(filename, "'filename' must not be null");
+		Assert.notNull(charset, "'charset' must not be null");
+
 		byte[] value = filename.getBytes(charset);
 		ByteArrayOutputStream baos = new ByteArrayOutputStream();
 		int index = 0;

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

@@ -63,12 +63,12 @@ class UndertowServerHttpResponse extends AbstractListenerServerHttpResponse impl
 			HttpServerExchange exchange, DataBufferFactory bufferFactory, UndertowServerHttpRequest request) {
 
 		super(bufferFactory, createHeaders(exchange));
-		Assert.notNull(exchange, "HttpServerExchange must not be null");
 		this.exchange = exchange;
 		this.request = request;
 	}
 
 	private static HttpHeaders createHeaders(HttpServerExchange exchange) {
+		Assert.notNull(exchange, "HttpServerExchange must not be null");
 		UndertowHeadersAdapter headersMap = new UndertowHeadersAdapter(exchange.getResponseHeaders());
 		return new HttpHeaders(headersMap);
 	}

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/RequestMatchResult.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -59,7 +59,7 @@ public class RequestMatchResult {
 	 */
 	public RequestMatchResult(PathPattern pathPattern, PathContainer lookupPath) {
 		Assert.notNull(pathPattern, "PathPattern is required");
-		Assert.notNull(pathPattern, "PathContainer is required");
+		Assert.notNull(lookupPath, "PathContainer is required");
 
 		this.pattern = null;
 		this.lookupPath = null;