Add author and refactor

Author: uyw4687

spring-batch-core/src/main/java/org/springframework/batch/core/step/tasklet/TaskletStep.java

@@ -72,6 +72,7 @@
  * @author Michael Minella
  * @author Will Schipp
  * @author Mahmoud Ben Hassine
+ * @author Seonkyo Ok
  */
 public class TaskletStep extends AbstractStep {
 
@@ -239,7 +240,7 @@ protected void doExecute(StepExecution stepExecution) throws Exception {
 			public RepeatStatus doInChunkContext(RepeatContext repeatContext, ChunkContext chunkContext)
 					throws Exception {
 
-				StepExecution stepExecution = chunkContext.getStepContext().getStepExecution();
+				final StepExecution stepExecution = chunkContext.getStepContext().getStepExecution();
 
 				// Before starting a new transaction, check for
 				// interruption.
@@ -374,7 +375,7 @@ public RepeatStatus doInTransaction(TransactionStatus status) {
 
 			RepeatStatus result = RepeatStatus.CONTINUABLE;
 
-			StepContribution contribution = stepExecution.createStepContribution();
+			final StepContribution contribution = stepExecution.createStepContribution();
 
 			chunkListener.beforeChunk(chunkContext);
 
@@ -444,7 +445,7 @@ public RepeatStatus doInTransaction(TransactionStatus status) {
 				catch (Exception e) {
 					// If we get to here there was a problem saving the step
 					// execution and we have to fail.
-					String msg = "JobRepository failure forcing rollback";
+					final String msg = "JobRepository failure forcing rollback";
 					logger.error(msg, e);
 					throw new FatalStepExecutionException(msg, e);
 				}
@@ -483,7 +484,7 @@ private void rollback(StepExecution stepExecution) {
 			}
 		}
 
-		private void copy(final StepExecution source, final StepExecution target) {
+		private static void copy(final StepExecution source, final StepExecution target) {
 			target.setVersion(source.getVersion());
 			target.setWriteCount(source.getWriteCount());
 			target.setFilterCount(source.getFilterCount());