[es] - Servlet beans jsp

nemnesic
Software Developer
Vranje - Florida

Moderator
Član broj: 44355
Poruke: 425
*.sfcc.edu.

Profil

^{19.02.2007. u 19:49}

da li je moguce da servlet (DataBeanLoader) pozove classu koja pravi data bean, i set-uje vrednosti u tom bean-u,
onda da napravi taj bean u application scopu da bi ostale JSP kasnije mogle da koriste taj bean?

ovaj servlet (DataBeanLoader) bi kasnije trebao da ide u web.xml, da bi posle restartovanja servera
data bean-ovi ponovo bili loadovani.

probao sam nesto tipa:

u init()
sam stavio

Code:

MyBean mb = new MyBean()
mb.setSomething(vrednost1);
getServletConfig().getServletContext().setAttribute("myBean", mb);

medjutim dobijam

java.lang.NullPointerException

hvala puno

-All programmers are playwrights and all computers are lousy actors.
http://www.ndnlogic.com

^{19.02.2007. u 19:49}

bgd2500

Član broj: 55912
Poruke: 161
*.finsoft.co.yu.

Profil

Re: Servlet beans jsp

^{20.02.2007. u 11:20}

Probaj samo

Code:

getServletContext().setAttribute("myBean", mb);

^{20.02.2007. u 11:20}

nemnesic
Software Developer
Vranje - Florida

Moderator
Član broj: 44355
Poruke: 425
*.com
Via: [es] mailing liste

Profil

Re: Servlet beans jsp

^{20.02.2007. u 13:16}

probao sam i to ranije ali ne radi
ponovo
java.lang.NullPointerException

nije mi jasno zasto NullPointerException?

Petreski ti ti sigurno znas? aj pomazi, razbijam glavu vec 2 dana

nn

-All programmers are playwrights and all computers are lousy actors.
http://www.ndnlogic.com

^{20.02.2007. u 13:16}

bgd2500

Član broj: 55912
Poruke: 161
*.finsoft.co.yu.

Profil

Re: Servlet beans jsp

^{20.02.2007. u 15:30}

Pa pogledaj gde ti tacno pukne exception, ili posalji ceo init() metod pa da vidimo.

^{20.02.2007. u 15:30}

nemnesic
Software Developer
Vranje - Florida

Moderator
Član broj: 44355
Poruke: 425
*.com
Via: [es] mailing liste

Profil

Re: Servlet beans jsp

^{20.02.2007. u 15:47}

pa pukne
bas ovde

Code:

getServletConfig().getServletContext().setAttribute("myBean", mb);

evo coda:

Code:

public void init(ServletConfig arg0) throws ServletException {

        try{
            srtCounty_bean();
        }
        catch(Exception e)
        {
            System.out.println("Error1");
            e.printStackTrace();
        }
        try{
            srtHs_bean();
        }
        catch(Exception e)
        {
            System.out.println("Error2");
            e.printStackTrace();

        }
    }

    private void srtCounty_bean(){

        DB_SRTCounty dbSrtCounty = new DB_SRTCounty();
        String[] countyNam = new String[70];
        String[] countyCd = new String[70];
        int counter = 0;

        countyNam = dbSrtCounty.getCounty_nam();
        countyCd = dbSrtCounty.getCounty_cd();
        counter = countyCd.length;

        SrtCountyBean srtCountyBean = new SrtCountyBean();

        srtCountyBean.setCounty_nam(countyNam);

        srtCountyBean.setCounty_cd(countyCd);

        srtCountyBean.setCounter(counter);


        try{


this.getServletConfig().getServletContext().setAttribute("srtCountyBean",
srtCountyBean);
        }
        catch(Exception e)
        {
            System.out.println(" ###################### " + countyNam[6]);
            e.printStackTrace();
        }

    }

    private void srtHs_bean() {
        DB_SRTHs dbSrtHs = new DB_SRTHs();
        String[] hsNam;
        String[] hsSfccCd;
        int counter_hs = 0;

        counter_hs = dbSrtHs.getRsCount();
        hsNam = new String[counter_hs];
        hsSfccCd = new String[counter_hs];
        hsNam = dbSrtHs.getHs_nam();
        hsSfccCd = dbSrtHs.getHs_sfcc_cd();

        SrtHsBean srtHsBean = new SrtHsBean();
        srtHsBean.setHs_nam(hsNam);
        srtHsBean.setHs_sfcc_cd(hsSfccCd);
        srtHsBean.setCounter(counter_hs);

        getServletConfig().getServletContext().setAttribute("srtHsBean",
srtHsBean);

    }

-All programmers are playwrights and all computers are lousy actors.
http://www.ndnlogic.com

^{20.02.2007. u 15:47}

bgd2500

Član broj: 55912
Poruke: 161
*.finsoft.co.yu.

Profil

Re: Servlet beans jsp

^{20.02.2007. u 16:43}

Osnovno pravilo je da servletov init() metod *MORA* prvo da pozove super.init().
Dakle,

Code:

public void init(ServletConfig cfg) throws ServletException {
super.init(cfg);
...

^{20.02.2007. u 16:43}

nemnesic
Software Developer
Vranje - Florida

Moderator
Član broj: 44355
Poruke: 425
*.com
Via: [es] mailing liste

Profil

Re: Servlet beans jsp

^{20.02.2007. u 16:53}

ma znam i to. probao ali nema razlike. ponovo sve isto.

nesto drugo da probam?

nn

-All programmers are playwrights and all computers are lousy actors.
http://www.ndnlogic.com

^{20.02.2007. u 16:53}

bgd2500

Član broj: 55912
Poruke: 161
*.adsl-1.sezampro.yu.

Profil

Re: Servlet beans jsp

^{20.02.2007. u 23:45}

Ne znam sta drugo da ti kazem sem da proveris jos jednom dal si nakon dodavanja super.init() uradio refresh, odnosno deplojnuo novu verziju.

PS: Meni radi lepo, a bez super.init() puca upravo sa NullPointerException-om.

^{20.02.2007. u 23:45}

nemnesic
Software Developer
Vranje - Florida

Moderator
Član broj: 44355
Poruke: 425
*.com
Via: [es] mailing liste

Profil

Re: Servlet beans jsp

^{21.02.2007. u 01:03}

>

da li je moguce da je upitanju neki server settings?

nn

-All programmers are playwrights and all computers are lousy actors.
http://www.ndnlogic.com

^{21.02.2007. u 01:03}

nemnesic
Software Developer
Vranje - Florida

Moderator
Član broj: 44355
Poruke: 425
*.com
Via: [es] mailing liste

Profil

Re: Servlet beans jsp

^{21.02.2007. u 19:37}

>

konacno sam resio problem.
ne mogu da verujem kakvu sam pocetnicku gresku naparavio.

"Evo Reeeseeenja"

ja iz init() sam zvao 2 funknije koje idu u DB uzimanju podatk, prave bean.
E sada, tu sam ja stavio

Code:
getServletConfig().getServletContext().setAttribute("srtHsBean",
srtHsBean);

!!!

getServletConfig() je razlicit od init(ServletConfig conf)!

zbog toga sada kada zovem ovde dve funkcije ja im posaljem conf kao
argument.
kako ovo nisam video ni sam ne znam!

u svakom slucaju bgd2500, hvalal ti!

pozdrav

nn

-All programmers are playwrights and all computers are lousy actors.
http://www.ndnlogic.com

^{21.02.2007. u 19:37}