Ensure step and job execution deserialisation works properly.

Fix bug in infinite loop sample.

spring-batch-core/src/test/java/org/springframework/batch/core/JobExecutionTests.java

@@ -172,6 +172,7 @@ public class JobExecutionTests {
 		JobExecution deserialize = (JobExecution) SerializationUtils.deserialize(serialized);
 		assertEquals(execution, deserialize);
 		assertNotNull(deserialize.createStepExecution("foo"));
+		assertNotNull(deserialize.getFailureExceptions());
 	}
 	
 	public void testFailureExceptions(){

spring-batch-core/src/test/java/org/springframework/batch/core/StepExecutionTests.java

@@ -263,6 +263,7 @@ public class StepExecutionTests {
 		
 		assertEquals(execution, deserialized);
 		assertEquals(status, deserialized.getExitStatus());
+		assertNotNull(deserialized.getFailureExceptions());
 	}
 	
 	@Test