diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/core/SqlProvider.java b/spring-jdbc/src/main/java/org/springframework/jdbc/core/SqlProvider.java
index 0b345033cd..e060bc1522 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/core/SqlProvider.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/core/SqlProvider.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 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.
@@ -36,7 +36,7 @@ public interface SqlProvider {
 	/**
 	 * Return the SQL string for this object, i.e.
 	 * typically the SQL used for creating statements.
-	 * @return the SQL string, or {@code null}
+	 * @return the SQL string, or {@code null} if not available
 	 */
 	@Nullable
 	String getSql();
diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/ParsedSql.java b/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/ParsedSql.java
index 83f5d3dcb8..d862838cc3 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/ParsedSql.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/core/namedparam/ParsedSql.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 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.
@@ -28,11 +28,11 @@ import java.util.List;
  */
 public class ParsedSql {
 
-	private String originalSql;
+	private final String originalSql;
 
-	private List<String> parameterNames = new ArrayList<>();
+	private final List<String> parameterNames = new ArrayList<>();
 
-	private List<int[]> parameterIndexes = new ArrayList<>();
+	private final List<int[]> parameterIndexes = new ArrayList<>();
 
 	private int namedParameterCount;