Improve exception handling in JobExecutionShutdownHook

Author: fmbenhassine

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

@@ -19,6 +19,7 @@
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.batch.core.job.JobExecution;
+import org.springframework.batch.core.launch.JobExecutionNotRunningException;
 import org.springframework.batch.core.launch.JobOperator;
 
 /**
@@ -54,6 +55,9 @@ public void run() {
 			this.jobOperator.stop(this.jobExecution);
 			this.logger.info("Successfully stopped job execution " + jobExecutionId);
 		}
+		catch (JobExecutionNotRunningException e) {
+			this.logger.warn("Job execution " + jobExecutionId + " is not running");
+		}
 		catch (Exception e) {
 			throw new RuntimeException("Unable to gracefully stop job execution " + jobExecutionId, e);
 		}