mysql - Getting data from database with java -

i'm working on java project , far going i'm stuck @ problem. have working connection database <-> program, have working login (users , pws in database) ... app parking system... in database have 1 table "upravljanje" (eng. control) have 1 row , 4 columns (now, max, cijenah, oznaka) (eng. cars in parking now, max capacity, price per hour, , id = 1) integers

other stuff working (they're strings , think that's prob)

this code of problem

    public static upravljanje dohvatiupravljanje(){     try{         connection conn = kreirajkonekciju();         statement stmt = conn.createstatement();         string sql = "select * upravljanje;";         resultset rs = stmt.executequery(sql);         upravljanje upravljanje = new upravljanje(rs.getint("max"), rs.getint("now"), rs.getint("cijenah"));         system.out.println("proba - max - - cijenah :"+rs.getint("max"));         conn.close();         return upravljanje;     }catch(exception e){         system.out.println("greska kod dohvacanja podataka o parkingu iz baze: "+e.tostring());         return null;     } } 

and red console

> greska kod dohvacanja podataka o parkingu iz baze: java.sql.sqlexception: before start of result set java.lang.nullpointerexception     @ view.upravljanjeframe.<init>(upravljanjeframe.java:104)     @ view.upravljanjeframe$1.run(upravljanjeframe.java:38)     @ java.awt.event.invocationevent.dispatch(unknown source)     @ java.awt.eventqueue.dispatcheventimpl(unknown source)     @ java.awt.eventqueue.access$500(unknown source)     @ java.awt.eventqueue$3.run(unknown source)     @ java.awt.eventqueue$3.run(unknown source)     @ java.security.accesscontroller.doprivileged(native method)     @ java.security.protectiondomain$javasecurityaccessimpl.dointersectionprivilege(unknown source)     @ java.awt.eventqueue.dispatchevent(unknown source)     @ java.awt.eventdispatchthread.pumponeeventforfilters(unknown source)     @ java.awt.eventdispatchthread.pumpeventsforfilter(unknown source)     @ java.awt.eventdispatchthread.pumpeventsforhierarchy(unknown source)     @ java.awt.eventdispatchthread.pumpevents(unknown source)     @ java.awt.eventdispatchthread.pumpevents(unknown source)     @ java.awt.eventdispatchthread.run(unknown source) 

please can me...

ps return "null" can me put smarter?

you have call .next() resultset, i.e.:

resultset rs = stmt.executequery(sql); if (rs.next()) {   upravljanje upravljanje = new upravljanje(rs.getint("max"), rs.getint("now"), rs.getint("cijenah"));   ... } 

or change 'if' 'while' in case expect multiple results. rs.getxxx return fields current row.