replaced map.containsKey with get and != null in MapStepRegistry

Resolves #4981

Signed-off-by: Thomas Krieger [email protected]
Signed-off-by: ThomasKrieger <[email protected]>

Author: ThomasKrieger

spring-batch-core/src/main/java/org/springframework/batch/core/configuration/support/MapStepRegistry.java

@@ -65,11 +65,11 @@ public void unregisterStepsFromJob(String jobName) {
 	public Step getStep(String jobName, String stepName) throws NoSuchJobException {
 		Assert.notNull(jobName, "The job name cannot be null.");
 		Assert.notNull(stepName, "The step name cannot be null.");
-		if (!map.containsKey(jobName)) {
+		final Map<String, Step> jobSteps = map.get(jobName);
+		if (jobSteps == null) {
 			throw new NoSuchJobException("No job configuration with the name [" + jobName + "] was registered");
 		}
 		else {
-			final Map<String, Step> jobSteps = map.get(jobName);
 			if (jobSteps.containsKey(stepName)) {
 				return jobSteps.get(stepName);
 			}