Add missing @Nullable annotations to LogMessage methods

Closes gh-30006

spring-core/src/main/java/org/springframework/core/log/LogMessage.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -28,6 +28,7 @@ import org.springframework.util.Assert;
  * format string ({@link String#format}) in its {@link #toString()}.
  *
  * @author Juergen Hoeller
+ * @author Sebastien Deleuze
  * @since 5.2
  * @see #of(Supplier)
  * @see #format(String, Object)
@@ -87,56 +88,57 @@ public abstract class LogMessage implements CharSequence {
 	/**
 	 * Build a lazily formatted message from the given format string and argument.
 	 * @param format the format string (following {@link String#format} rules)
-	 * @param arg1 the argument
+	 * @param arg1 the argument (can be {@code null})
 	 * @see String#format(String, Object...)
 	 */
-	public static LogMessage format(String format, Object arg1) {
+	public static LogMessage format(String format, @Nullable Object arg1) {
 		return new FormatMessage1(format, arg1);
 	}
 
 	/**
 	 * Build a lazily formatted message from the given format string and arguments.
 	 * @param format the format string (following {@link String#format} rules)
-	 * @param arg1 the first argument
-	 * @param arg2 the second argument
+	 * @param arg1 the first argument (can be {@code null})
+	 * @param arg2 the second argument (can be {@code null})
 	 * @see String#format(String, Object...)
 	 */
-	public static LogMessage format(String format, Object arg1, Object arg2) {
+	public static LogMessage format(String format, @Nullable Object arg1, @Nullable Object arg2) {
 		return new FormatMessage2(format, arg1, arg2);
 	}
 
 	/**
 	 * Build a lazily formatted message from the given format string and arguments.
 	 * @param format the format string (following {@link String#format} rules)
-	 * @param arg1 the first argument
-	 * @param arg2 the second argument
-	 * @param arg3 the third argument
+	 * @param arg1 the first argument (can be {@code null})
+	 * @param arg2 the second argument (can be {@code null})
+	 * @param arg3 the third argument (can be {@code null})
 	 * @see String#format(String, Object...)
 	 */
-	public static LogMessage format(String format, Object arg1, Object arg2, Object arg3) {
+	public static LogMessage format(String format, @Nullable Object arg1, @Nullable Object arg2, @Nullable Object arg3) {
 		return new FormatMessage3(format, arg1, arg2, arg3);
 	}
 
 	/**
 	 * Build a lazily formatted message from the given format string and arguments.
 	 * @param format the format string (following {@link String#format} rules)
-	 * @param arg1 the first argument
-	 * @param arg2 the second argument
-	 * @param arg3 the third argument
-	 * @param arg4 the fourth argument
+	 * @param arg1 the first argument (can be {@code null})
+	 * @param arg2 the second argument (can be {@code null})
+	 * @param arg3 the third argument (can be {@code null})
+	 * @param arg4 the fourth argument (can be {@code null})
 	 * @see String#format(String, Object...)
 	 */
-	public static LogMessage format(String format, Object arg1, Object arg2, Object arg3, Object arg4) {
+	public static LogMessage format(String format, @Nullable Object arg1, @Nullable Object arg2, @Nullable Object arg3,
+			@Nullable Object arg4) {
 		return new FormatMessage4(format, arg1, arg2, arg3, arg4);
 	}
 
 	/**
 	 * Build a lazily formatted message from the given format string and varargs.
 	 * @param format the format string (following {@link String#format} rules)
-	 * @param args the varargs array (costly, prefer individual arguments)
+	 * @param args the varargs array (can be {@code null}, costly, prefer individual arguments)
 	 * @see String#format(String, Object...)
 	 */
-	public static LogMessage format(String format, Object... args) {
+	public static LogMessage format(String format, @Nullable Object... args) {
 		return new FormatMessageX(format, args);
 	}
 
@@ -170,9 +172,10 @@ public abstract class LogMessage implements CharSequence {
 
 	private static final class FormatMessage1 extends FormatMessage {
 
+		@Nullable
 		private final Object arg1;
 
-		FormatMessage1(String format, Object arg1) {
+		FormatMessage1(String format, @Nullable Object arg1) {
 			super(format);
 			this.arg1 = arg1;
 		}
@@ -186,11 +189,13 @@ public abstract class LogMessage implements CharSequence {
 
 	private static final class FormatMessage2 extends FormatMessage {
 
+		@Nullable
 		private final Object arg1;
 
+		@Nullable
 		private final Object arg2;
 
-		FormatMessage2(String format, Object arg1, Object arg2) {
+		FormatMessage2(String format, @Nullable Object arg1, @Nullable Object arg2) {
 			super(format);
 			this.arg1 = arg1;
 			this.arg2 = arg2;
@@ -205,13 +210,16 @@ public abstract class LogMessage implements CharSequence {
 
 	private static final class FormatMessage3 extends FormatMessage {
 
+		@Nullable
 		private final Object arg1;
 
+		@Nullable
 		private final Object arg2;
 
+		@Nullable
 		private final Object arg3;
 
-		FormatMessage3(String format, Object arg1, Object arg2, Object arg3) {
+		FormatMessage3(String format, @Nullable Object arg1, @Nullable Object arg2, @Nullable Object arg3) {
 			super(format);
 			this.arg1 = arg1;
 			this.arg2 = arg2;
@@ -227,15 +235,20 @@ public abstract class LogMessage implements CharSequence {
 
 	private static final class FormatMessage4 extends FormatMessage {
 
+		@Nullable
 		private final Object arg1;
 
+		@Nullable
 		private final Object arg2;
 
+		@Nullable
 		private final Object arg3;
 
+		@Nullable
 		private final Object arg4;
 
-		FormatMessage4(String format, Object arg1, Object arg2, Object arg3, Object arg4) {
+		FormatMessage4(String format, @Nullable Object arg1, @Nullable Object arg2, @Nullable Object arg3,
+				@Nullable Object arg4) {
 			super(format);
 			this.arg1 = arg1;
 			this.arg2 = arg2;
@@ -252,9 +265,10 @@ public abstract class LogMessage implements CharSequence {
 
 	private static final class FormatMessageX extends FormatMessage {
 
+		@Nullable
 		private final Object[] args;
 
-		FormatMessageX(String format, Object... args) {
+		FormatMessageX(String format, @Nullable Object... args) {
 			super(format);
 			this.args = args;
 		}