feat: add final to job and stepBuilderFactory fields

Author: brick0123

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

@@ -24,11 +24,11 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
- *
+ * @author brick0123
  */
 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

@@ -25,13 +25,13 @@
  *
  * @author Dave Syer
  * @author Mahmoud Ben Hassine
- *
+ * @author brick0123
  */
 public class StepBuilderFactory {
 
-	private JobRepository jobRepository;
+	private final JobRepository jobRepository;
 
-	private PlatformTransactionManager transactionManager;
+	private final PlatformTransactionManager transactionManager;
 
 	/**
 	 * Constructor for the {@link StepBuilderFactory}.