getGeneratedKeys() after PreparedStatement.executeBatch()

I want to INSERT several rows using a PreparedStatement:

ps = con.prepareStatement(query,PreparedStatement.RETURN_GENERATED_KEYS);

for(Element e:listOfElements){
    ps.setString(1,this.col_val_1);
    ps.setString(2,this.col_val_2);
    ps.setInt(3,this.col_val_3);

    ps.addBatch();
}

ps.executeBatch();
ResultSet rs = ps.getGeneratedKeys();

At this point, whent I expect to get the PK's generated for each INSERT, I get this SQLServerException:

com.microsoft.sqlserver.jdbc.SQLServerException: The statement must be executed before any results can be obtained.

I expected to get a ResultSet with one row for each insert performed, so I could get each PK generated.

Am I expecting wrong? Am I doing something wrong? Can it be done in a different way using batch execution?