Add final to RunIdIncrementer and Job/Step BuilderFactory fields

Issue #4143

Author: brick0123

spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/JobBuilderFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -25,14 +25,15 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Jinho Han
  * @deprecated Deprecated as of v5.0 and scheduled for removal in v5.2 in favor of using
  * the {@link JobBuilder}.
  *
  */
 @Deprecated(since = "5.0.0", forRemoval = true)
 public class JobBuilderFactory {
 
-	private JobRepository jobRepository;
+	private final JobRepository jobRepository;
 
 	/**
 	 * @param jobRepository The {@link JobRepository} to be used by the builder factory.

spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/StepBuilderFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -26,14 +26,15 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Jinho Han
  * @deprecated Deprecated as of v5.0 and scheduled for removal in v5.2 in favor of using
  * the {@link StepBuilder}.
  *
  */
 @Deprecated(since = "5.0.0", forRemoval = true)
 public class StepBuilderFactory {
 
-	private JobRepository jobRepository;
+	private final JobRepository jobRepository;
 
 	/**
 	 * Constructor for the {@link StepBuilderFactory}.

spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/RunIdIncrementer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2020 the original author or authors.
+ * Copyright 2006-2023 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.
@@ -28,10 +28,11 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
+ * @author Jinho Han
  */
 public class RunIdIncrementer implements JobParametersIncrementer {
 
-	private static String RUN_ID_KEY = "run.id";
+	private static final String RUN_ID_KEY = "run.id";
 
 	private String key = RUN_ID_KEY;