Clean up warnings in Gradle build, polishing, etc.

spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/SqlParameterSourceUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -44,7 +44,6 @@ public abstract class SqlParameterSourceUtils {
 	 * @see BeanPropertySqlParameterSource
 	 * @see NamedParameterJdbcTemplate#batchUpdate(String, SqlParameterSource[])
 	 */
-	@SuppressWarnings("unchecked")
 	public static SqlParameterSource[] createBatch(Object... candidates) {
 		return createBatch(Arrays.asList(candidates));
 	}