java - how to query dynamodb with LSI and mapper -

i trying load info dynamo db table using lsi , dynamodb mapper class. assume have following code

conisder class

class employee {     @dynamodbhashkey     public string getid() {         return id;     }     @dynamodbrangekey     public string getfirstname() {         return firstname;     }      @dynamodbindexrangekey(localsecondaryindexname = "my-lsi")     public string getlastname() {     return lastname;     }      public string getmyotherfield() {     return myotherfield;     } } 

consider piece of code retrieve info using lsi , dynamodb mapper

employee obj = new employee(); obj.setid("221"); obj.setlastname("someone"); dynamodbqueryexpression<employee> queryexpression = new dynamodbqueryexpression<>(); queryexpression.sethashkeyvalues(obj); queryexpression.setindexname("my-lsi"); queryexpression.setprojectionexpression("myotherfield");  paginatedquerylist<employee> paginatedquerylist = mapper.query(employee.class, queryexpression); iterator<employee> iterator = paginatedquerylist.iterator(); while (iterator.hasnext()) {     employee pp = iterator.next();     // code } 

[edit] right way query lsi mapper? if not better way fetch data table using lsi , dynamodbmapper? (in terms of performance)

i found https://java.awsblog.com/post/tx3gyzevgo924k4/the-dynamodbmapper-local-secondary-indexes-and-you 2013 link. not able find latest documentation on querying lsi , mapper.

note in code have given, haven't set range key @ all. use queryexpression.setrangekeyconditions() so.

here code sample:

map<string, condition> rangekeyconditions = new hashmap<>(); rangekeyconditions.put("lastname", new condition()                  .withcomparisonoperator(comparisonoperator.eq)                 .withattributevaluelist(new attributevalue().withs("someone"))); queryexpression.setrangekeyconditions(rangekeyconditions);` 

[update]:

it not sufficient (nor necessary) set range key value ("someone") in object (obj), since object used setting hashkey. have @ examples here