diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/JobBuilderFactory.java b/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/JobBuilderFactory.java
index 38f296cd5f..4d2d4530d1 100644
--- a/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/JobBuilderFactory.java
+++ b/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 Jinho Han
  */
 public class JobBuilderFactory {
 
-	private JobRepository jobRepository;
+	private final JobRepository jobRepository;
 
 	/**
 	 * @param jobRepository The {@link JobRepository} to be used by the builder factory.
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/StepBuilderFactory.java b/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/StepBuilderFactory.java
index 7bf46d8b20..758f157f9b 100644
--- a/spring-batch-core/src/main/java/org/springframework/batch/core/configuration/annotation/StepBuilderFactory.java
+++ b/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 Jinho Han
  */
 public class StepBuilderFactory {
 
-	private JobRepository jobRepository;
+	private final JobRepository jobRepository;
 
-	private PlatformTransactionManager transactionManager;
+	private final PlatformTransactionManager transactionManager;
 
 	/**
 	 * Constructor for the {@link StepBuilderFactory}.
diff --git a/spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/RunIdIncrementer.java b/spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/RunIdIncrementer.java
index d83ddeb85d..6d3e1d60b2 100644
--- a/spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/RunIdIncrementer.java
+++ b/spring-batch-core/src/main/java/org/springframework/batch/core/launch/support/RunIdIncrementer.java
@@ -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;