RESOLVED - issue BATCH-367: When the samples run, all the execution attributes are of type STRING - this must be wrong.

http://jira.springframework.org/browse/BATCH-367

fixed StreamManager not to alter ExecutionContext values + added testcase

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/stream/SimpleStreamManager.java

@@ -102,7 +102,7 @@ public class SimpleStreamManager implements StreamManager {
 				for (Iterator iterator = context.entrySet().iterator(); iterator.hasNext();) {
 					Entry entry = (Entry) iterator.next();
 					String contextKey = prefix + entry.getKey();
-					result.putString(contextKey, entry.getValue().toString());
+					result.put(contextKey, entry.getValue());
 				}
 			}
 		});