exception - How can I fix java.lang.ExceptionInInitializerError? -

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i writing game , in last phrase. going write load class when press load button, exception, caused null pointer.

however, allocated every object , arrays new. moreover, have points non-static volatile.

this code: 

class loadstate  {     private char[] mapx;     int x=0, y=0;      public loadstate()throws filenotfoundexception, ioexception      {         string line;         (int i=0;i<10;i++)         {             gameplay.tm[i].start();         }     }     gameplay.t.start();     int flag=0;     int m=0;     bufferedreader fr=new bufferedreader(new filereader("save.txt"));     while((line=fr.readline())!=null){         if(flag==0){             gameplay.me.name=line;         }         if (flag==1){             gameplay.tt.time=integer.parseint(line);         }         else if(flag==2){             gameplay.lvl=integer.parseint(line);         }         else if(flag==3){             gameplay.win=boolean.parseboolean(line);         }         else if(flag==4){             gameplay.mainlvl=boolean.parseboolean(line);         }         else if(flag==5){             gameplay.lvl1=boolean.parseboolean(line);         }         else if(flag==6){             gameplay.lvl2=boolean.parseboolean(line);         }         else if(flag==7){              gameplay.lvl3=boolean.parseboolean(line);         }         else if(flag>7&&flag<37){             if(flag%3==2){                 x=integer.parseint(line);             }             if(flag%3==0){                 y=integer.parseint(line);                 gameplay.monster[m].oldpos.setlocation(x, y);             }             if(flag%3==1){                gameplay.monster[m].existance=boolean.parseboolean(line);                 m++;             }         }         else if(flag==37){             x=integer.parseint(line);         }         else if(flag==38){             y=integer.parseint(line);             gameplay.me.oldpos.setlocation(x, y);         }         else if(flag==39){             gameplay.me.killed=integer.parseint(line);         }         else if(flag==40){             gameplay.me.health=integer.parseint(line);         }         else if(flag>40){             mapx=line.tochararray();             for(int i=0;i<map.length;i++){                 map[flag-41][i]=integer.parseint(""+mapx[i]);             }         }         flag++;     }     fr.close();   } }       class gameplay extends jpanel implements actionlistener{ static boolean lvl1=true; static boolean lvl2=false; static boolean lvl3=false; static boolean mainlvl=false; static me me=new me(); static portal portal=new portal(); static shot shot=new shot(); static thread s; static keyboard keyboard=new keyboard(); static monster monster[]=new monster[10]; static boolean win; static thread tm[]=new thread[10]; static int score=1000; static timethread tt=new timethread(); static thread t=new thread(tt); static int time=0; jbutton btn=new jbutton("start"); jbutton btn1=new jbutton("stop"); jbutton btn2=new jbutton("fixer"); jlabel lbl=new jlabel("time :"); jlabel lbl1=new jlabel("score :"); jlabel lbl2=new jlabel("health :"); jlabel lbl3=new jlabel("assasins :"); /**/}

i call game play before load state.


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