jnngrm
commented
10 years ago Little more info on this...if you drill down into AWS SDK to the method used, it states null is a valid response:
/**
* Returns an object whose keys match those of the prototype key object given,
* or null if no such item exists.
*
* @param keyObject
* An object of the class to load with the keys values to match.
* @param config
* Configuration for the service call to retrieve the object from
* DynamoDB. This configuration overrides the default given at
* construction.
*/
public <T extends Object> T load(T keyObject, DynamoDBMapperConfig config) {
@SuppressWarnings("unchecked")
Class<T> clazz = (Class<T>) keyObject.getClass();
config = mergeConfig(config);
String tableName = getTableName(clazz, config);
GetItemRequest rq = new GetItemRequest()
.withRequestMetricCollector(config.getRequestMetricCollector());
Map<String, AttributeValue> key = getKey(keyObject, clazz);
rq.setKey(key);
rq.setTableName(tableName);
rq.setConsistentRead(config.getConsistentReads() == ConsistentReads.CONSISTENT);
GetItemResult item = db.getItem(applyUserAgent(rq));
Map<String, AttributeValue> itemAttributes = item.getItem();
if ( itemAttributes == null ) {
return null;
}
T object = marshalIntoObject(toParameters(itemAttributes, clazz, config));
return object;
}Also, for a little more context, here's the exception that is thrown:
java.lang.IllegalArgumentException: null source
at java.util.EventObject.
michaellavelle
When using CRUD operation:
It is possible that Amazon API will return null Entity if no entity found. However the instantation of AfterLoadEvent specifically checks for null argument and throws exception if argument found. Perhaps an artifact of newer spring 4.x versions?
/* * Constructs a prototypical Event. * @param source The object on which the Event initially occurred. * @exception IllegalArgumentException if source is null. */ public EventObject(Object source) { if (source == null) throw new IllegalArgumentException("null source");