java - AndEngine: Getting a NullPointerException on UpdateThread when adding a Sprite -

getting nullpointerexception on updatethread when adding sprite

i'm creating first game in andengine , trying add sprite gamescene class. i've been tinkering hours application kept crashing after splash screen, supposed load gamescene afterwards. i've narrowed down these of code in drawpanel() method:

selectpanel[0] = new sprite(0, 0, resourcemanager.balltextureregionarray[0], vbom) {     @override     protected void predraw(glstate pglstate, camera pcamera) {         super.predraw(pglstate, pcamera);         pglstate.enabledither();     } }; selectpanel[0].setposition(240, 400); attachchild(selectpanel[0]); 

here resourcemanager class loaded ball texture:

    balltexture = new bitmaptextureatlas(act.gettexturemanager(), 64, 576);      balltextureregionarray[0] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "red_ball.png", 0, 0);     balltextureregionarray[1] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "blue_ball.png", 0, 64);     balltextureregionarray[2] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "green_ball.png", 0, 128);     balltextureregionarray[3] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "purple_ball.png", 0, 192);     balltextureregionarray[4] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "yellow_ball.png", 0, 256);     balltextureregionarray[5] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "orange_ball.png", 0, 320);     balltextureregionarray[6] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "black_ball.png", 0, 384);     balltextureregionarray[7] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "white_ball.png", 0, 448);     balltextureregionarray[8] = bitmaptextureatlastextureregionfactory             .createfromasset(balltexture, act, "select_ball.png", 0, 512);      balltexture.load(); // load balltexture scene 

... , of course error.

11-28 17:44:44.750: e/androidruntime(2119): fatal exception: updatethread 11-28 17:44:44.750: e/androidruntime(2119): java.lang.nullpointerexception 11-28 17:44:44.750: e/androidruntime(2119):     @   com.eklypze.android.mastermdhd.gamescene.drawpanel(gamescene.java:188) 11-28 17:44:44.750: e/androidruntime(2119):     @     com.eklypze.android.mastermdhd.gamescene.createscene(gamescene.java:68) 11-28 17:44:44.750: e/androidruntime(2119):     @     com.eklypze.android.mastermdhd.basescene.<init>(basescene.java:38) 11-28 17:44:44.750: e/androidruntime(2119):     @ com.eklypze.android.mastermdhd.gamescene.<init>(gamescene.java:28) 11-28 17:44:44.750: e/androidruntime(2119):     @ com.eklypze.android.mastermdhd.scenemanager.creategamescene(scenemanager.java:120) 11-28 17:44:44.750: e/androidruntime(2119):     @ com.eklypze.android.mastermdhd.baseactivity$1.ontimepassed(baseactivity.java:84) 11-28 17:44:44.750: e/androidruntime(2119):     @ org.andengine.engine.handler.timer.timerhandler.onupdate(timerhandler.java:94) 11-28 17:44:44.750: e/androidruntime(2119):     @ org.andengine.engine.handler.updatehandlerlist.onupdate(updatehandlerlist.java:47) 11-28 17:44:44.750: e/androidruntime(2119):     @ org.andengine.engine.engine.onupdateupdatehandlers(engine.java:618) 11-28 17:44:44.750: e/androidruntime(2119):     @ org.andengine.engine.engine.onupdate(engine.java:605) 11-28 17:44:44.750: e/androidruntime(2119):     @ org.andengine.engine.engine.ontickupdate(engine.java:568) 11-28 17:44:44.750: e/androidruntime(2119):     @ org.andengine.engine.engine$updatethread.run(engine.java:858) 

here gamescene.java class:

package com.eklypze.android.mastermdhd;  import java.util.random;  import javax.microedition.khronos.opengles.gl10;  import org.andengine.engine.camera.camera; import org.andengine.entity.modifier.alphamodifier; import org.andengine.entity.modifier.loopentitymodifier; import org.andengine.entity.scene.background.spritebackground; import org.andengine.entity.sprite.sprite; import org.andengine.input.touch.touchevent; import org.andengine.opengl.util.glstate;  import android.util.log;  import com.eklypze.android.mastermdhd.scenemanager.scenetype;  public class gamescene extends basescene {     /*** declarations ***/     /* settings */     protected static final int camera_width = 480;     protected static final int camera_height = 800;     /* sprites */     sprite[] selectpanel = new sprite[8];     sprite boardpieces[] = new sprite[40];     sprite bwpegs[] = new sprite[10];     sprite nextspot; // "next spot" cursor     sprite gameoverlose, gameoverwin; // replace scenes     /* game options */     private int turn = 0;     private int turncounter = 0; // per line turn counter     private int currentx = 1;     private int currenty = 13;     private int[] code = new int[4]; // array store generated code     private int[] codecopy = new int[4]; // black&white peg use     private int blackpegs = 0, whitepegs = 0;     // remember take currentx-1 array indexes     private int[] currentxvalues = new int[4];     // dummy variable when drawing selectpanel touch *don't delete*     private int z = 0;     boolean gameover = false;     boolean doublesallowed = false;      /************************************      * ------------inherited------------      ************************************/      @override     /********************************      * createscene()      ********************************/     public void createscene() {         // create scene bgsprite background         setbackground(new spritebackground(resourcemanager.bgsprite));         // step 1: start new game         newgame();         // step 2: draw selectpanel         drawpanel(); // debugging: game seems work until point      }      @override     /********************************      * onbackkeypressed()      ********************************/     public void onbackkeypressed() {         system.exit(0);     }      @override     /********************************      * getscenetype()      ********************************/     public scenetype getscenetype() {         return scenetype.scene_game;     }      @override     /********************************      * disposescene()      ********************************/     public void disposescene() {         this.detachself();         this.dispose();     }      /************************************      * -----------game methods-----------      ************************************/      /********************************      * newgame()      * description: initialize game      * settings new session.      ********************************/     private void newgame() {         /* [start] generate new code combination         (int x = 0; x < 4; x++) {             random r = new random();             // if doubles not allowed check if new generated number             // double, if yes, generate number. note: doubles             // defaulted 'off' until feature added.             int randomnumber = r.nextint(8); // why (7-0)+0?             log.v("randomr", "number generated " + randomnumber);             code[x] = randomnumber;             // write log (debugging)             log.v("thecode", "number generated " + x + " is: " + code[x]                     + " (" + resourcemanager.ballcolours[randomnumber] + ")");             // if doubles not allowed check if new generated number             // double, if yes, generate number. note: doubles             // defaulted 'off' until feature added.             if (!doublesallowed && x > 0) {                 (int y = x - 1; y >= 0; y--) {                     // log.v("they", "y "+y);                     if (code[y] == randomnumber) {                         x--;                     }                 }             }         } [end] generate new code combination */         code = new int[] { 7, 1, 2, 3 };         log.v("thecode", "the code is: " + code[0] + "," + code[1] + ","                 + code[2] + "," + code[3] + ".");         codecopy = code.clone(); // copies code array white/black peg use     }      /********************************      * drawpanel()      * description: draw panels      * required user selection.      ********************************/     private void drawpanel() {         int column = 7; // constant?         int rowstart = 2;          /* [start] draw selection selectpanel         (int = 0; < 8; i++) {             final int j = i;             selectpanel[i] = new sprite(grid_xpixel(column),                     grid_ypixel(rowstart),                     resourcemanager.balltextureregionarray[i], vbom) {                 @override                 /* [start] touch detection                 public boolean onareatouched(touchevent pscenetouchevent,                         float ptoucharealocalx, float ptoucharealocaly) {                     switch (pscenetouchevent.getaction()) {                             // on touch                             case touchevent.action_down:                                 this.setscale(2.0f); // enlarge effect                                 z = j;                                 log.v("thisisz", "z: " + z);                                 break;                             // on move/drag                             case touchevent.action_move: {                                 /* implemented in future                                 // this.setposition(pscenetouchevent.getx() -                                 // this.getwidth()/2, pscenetouchevent.gety() -                                 // this.getheight()/2);                                 break;                             }                             // on release                             case touchevent.action_up:                                 // z = j; // not needed                                 makemove(z);                                 this.setscale(1.0f); // normal size                                 break;                     }                     return super.onareatouched(pscenetouchevent,                             ptoucharealocalx, ptoucharealocaly);                 }                 [end] touch detection             }; */              // selectpanel[0] = new sprite(200, 400,             //      resourcemanager.balltextureregionarray[0], vbom);             //attachchild(selectpanel[0]);         //registertoucharea(selectpanel[i]);         selectpanel[0] = new sprite(0, 0, resourcemanager.balltextureregionarray[0], vbom) {             @override             protected void predraw(glstate pglstate, camera pcamera) {                 super.predraw(pglstate, pcamera);                 pglstate.enabledither();             }         };         selectpanel[0].setposition(240, 400);         attachchild(selectpanel[0]);         //} /* [end] draw selection selectpanel */         // settouchareabindingonactiondownenabled(true);     }      /********************************      * makemove()      * description: allow player      * make selection ,      * display pegs result.      ********************************/     private void makemove(int incolor) {         boardpieces[turn] = new sprite(grid_xpixel(currentx),                 grid_ypixelboard(currenty),                 resourcemanager.balltextureregionarray[incolor], vbom);         boardpieces[turn].setscale(0.75f); // set 75% size on board          // store current line, compare values code , generate b/w pegs         currentxvalues[currentx - 1] = incolor;         if (currentxvalues[currentx - 1] == codecopy[currentx - 1]) {             blackpegs++;             // dummy variable isn't counted again white peg             codecopy[currentx - 1] = 999;         }          (int = 0; < 4; i++) {             if ((currentxvalues[currentx - 1] == codecopy[i])) {                 whitepegs++;                 // dummy variable isn't counted again white peg                 codecopy[i] = 999;             }         }          /* log debugging */         log.v("pegs", "blackpegs: " + blackpegs);         log.v("pegs", "whitepegs: " + whitepegs);          // draw pieces scene , advance next turn & column         attachchild(boardpieces[turn]);         currentx++;         turn++;          // advance next row, draw b/w pegs         if (currentx > 4) {             currentx = 1;             currenty--;              // draw pegs             drawbwpegs(blackpegs, whitepegs);             turncounter++;              // reset pegs next line             blackpegs = 0;             whitepegs = 0;              // codecopy used counting black , white             // pegs per line ensure cases work             codecopy = code.clone();         }          /* [start] draw blinking cursor in next spot */         nextspot = new sprite(grid_xpixel(currentx),                 grid_ypixelboard(currenty),                 resourcemanager.balltextureregionarray[8], vbom);         nextspot.setscale(0.75f);          nextspot.setblendfunction(gl10.gl_src_alpha,                 gl10.gl_one_minus_src_alpha);         nextspot.registerentitymodifier(new loopentitymodifier(                 new alphamodifier(2, 0f, 1.0f)));         attachchild(nextspot);         /* [end] draw blinking cursor in next spot */          /* *          * game on (lose)          *  if player reaches turn 40 , still has not received          *  correct code, go game on (lose) scene.          * */         if (turn == 40) {             // note: replace game on scene.             gameoverwin(false);             log.v("game over", "you lose");             gameoverlose = new sprite(camera_width / 2 - 256,                     camera_height / 2 - 64, resourcemanager.losetextureregion,                     vbom);             attachchild(gameoverlose);         }     }      /********************************      * gameoverwin()      * description: display gameover      * image result of user      * winning game.      ********************************/     private void gameoverwin(boolean win) {         // clear game         detachchildren();         turn = 0;      }      /********************************      * drawbwpegs()      * description: draw black      * , white pegs scene      * based on game results.      ********************************/     private void drawbwpegs(int numblack, int numwhite) {         /* [start] if */         // not display if no pegs counted         if (numblack > 0 || numwhite > 0) {             int pegscore = 0;             // determine pegscore             if (numblack == 1 && numwhite == 0) {                 pegscore = 0;             } else if (numblack == 1 && numwhite == 2) {                 pegscore = 1;             } else if (numblack == 1 && numwhite == 3) {                 pegscore = 2;             } else if (numblack == 0 && numwhite == 1) {                 pegscore = 3;             } else if (numblack == 2 && numwhite == 0) {                 pegscore = 4;             } else if (numblack == 2 && numwhite == 2) {                 pegscore = 5;             } else if (numblack == 0 && numwhite == 2) {                 pegscore = 6;             } else if (numblack == 3 && numwhite == 0) {                 pegscore = 7;             } else if (numblack == 3 && numwhite == 1) {                 pegscore = 8;             } else if (numblack == 0 && numwhite == 3) {                 pegscore = 9;             } else if (numblack == 4 && numwhite == 0) {                 pegscore = 10;             } else if (numblack == 0 && numwhite == 4) {                 pegscore = 11;             } /* [end] if */             // use pegscore display corresponding image             bwpegs[turncounter] = new sprite(grid_xpixel(5),                     grid_ypixelboard(currenty + 1),                     resourcemanager.pegtextureregionarray[pegscore], vbom);             bwpegs[turncounter].setscale(0.80f);             attachchild(bwpegs[turncounter]);         }     }      /********************************      * ---------grid system---------      ********************************/      /************************************      * grid_xpixel()      * description: converts grid      * coordinates pixel coordinates      * based on 480 800 resolution      * screen. needs updated.      ************************************/     private int grid_xpixel(int x) {         int pixel = 0;         pixel = x * (camera_width / 8 + 2) - 32;         return pixel;     }      /************************************      * grid_ypixel()      * description: y-grid user      * selection panel.      ************************************/     private int grid_ypixel(int y) {         int pixel = 0;         pixel = y * (camera_height / 10) - 32;         return pixel;     }      /************************************      * grid_ypixelboard()      * description: y-grid main      * game board.      ************************************/     private int grid_ypixelboard(int y) {         int pixel = 0;         pixel = y * (camera_height / 15) - 32;         return pixel;     } } 

i apologize i'm new stackoverflow , don't quite know how format code properly. also, if i'm missing important areas of code relevant question please let me know have many lines of code , don't quite know start.

thanks in advance!

looking @ code i'd balltextureregionarray[0] null pointer, because wasn't loaded in resourcemanager initialisation.

if .png files resources i.e. in "res" directory not "asset" directory need load .createfromresource not .createfromasset.