DynamoDB ItemCollection<QueryOutcome> to java object - amazon-dynamodb

Question

I want to convert ItemCollection into my java pojo object .I want currently doing so by following way .What is the best way to do so?
QuerySpec spec = new QuerySpec()
.withKeyConditionExpression("txn_id = :txnId")
.withFilterExpression("rrn = :rrn")
.withValueMap(new ValueMap()
.withString(":txnId", txnId)
.withString(":rrn", rrn))
.withConsistentRead(true);
ItemCollection<QueryOutcome> items = table.query(spec);
here i got ItemCollection .Now i will be converting it to my java pojo :-
Iterator<Item> iter = items.iterator();
while (iter.hasNext()) {
String txn = iter.next().toJSON();
Gson gson = new Gson();
Test t = gson.fromJson(txn, Test.class);
return t;
}
Is there a way to convert dynamodb fetch value( ItemCollection) to java pojo directly like we do in mysql ?Why i will always get json then covert to pojo .We don't do so in other DB like mysql or oracle DB .
Text.java
public class Test implements Serializable {
#DynamoDBAttribute(attributeName = "txn_id")
#JsonProperty("txn_id")
#DynamoDBHashKey
private String txnId;
private String umn;
private String note;
#DynamoDBAttribute(attributeName = "rrn")
private String rrn;
#DynamoDBAttribute(attributeName = "expire_on")
private Date expireOn;
#DynamoDBAttribute(attributeName = "expire_after")
private Integer expireAfter;
#DynamoDBAttribute(attributeName = "created_on")
#DynamoDBAutoGeneratedTimestamp(strategy= DynamoDBAutoGenerateStrategy.CREATE)
private Date createdOn;
}

Answer 1

Yes, take a look at DynamoDBMapper. Uses the same pojo annotations...
CatalogItem partitionKey = new CatalogItem();
partitionKey.setId(102);
DynamoDBQueryExpression<CatalogItem> queryExpression = new DynamoDBQueryExpression<CatalogItem>()
.withHashKeyValues(partitionKey);
List<CatalogItem> itemList = mapper.query(CatalogItem.class, queryExpression);
for (int i = 0; i < itemList.size(); i++) {
System.out.println(itemList.get(i).getTitle());
System.out.println(itemList.get(i).getBookAuthors());
}