Need help with my text based game

[czarcalvinsk]

I've been creating a game in Java where you have to chase down an enemy character in a certain turn constraint. However, I have been having problems with the AI going out of the array limit for the map. I added a constraint that checks if it goes out of the map, but it hasn't solved it.
here are the variables defined at the top of the class

	byte[][] map=new byte[10][10];
	byte changex=0;
	byte changey=0;
	byte AIchangex=0;
	byte AIchangey=0;
	byte plrCoordinates[] = new byte[2];
	byte AICoordinates[] = new byte[2];

here is the render code

	void render(){
		
		char a=i.move();
		if (a=='w'){
			if (plrCoordinates[0]==1){
				render();
			}else{
				changey=-1;
			}
		}
		if (a=='s'){
			if (plrCoordinates[0]==8){
				render();
			}else{
				changey=1;
			}
		}
		if (a=='a'){
			if (plrCoordinates[1]==1){
				render();
			}else{
				changey=-1;
			}
		}
		if (a=='d'){
			if (plrCoordinates[1]==8){
				render();
			}else{
				changey=1;
			}
		}
		Random AIMove= new Random();
		int x= AIMove.nextInt(3);
		if (x==0){
			if (AICoordinates[0]==8){
				render();
			}else{
				AIchangex=-1;
			}
		}
		if (x==1){
			if (AICoordinates[0]==1){
				render();
			}else{
				AIchangex=1;
			}
		}
		if (x==2){
			if (AICoordinates[1]==1){
				render();
			}else{
				AIchangey=-1;
			}
		}
		if (x==3){
			if (AICoordinates[1]==8){
				render();
			}else{
				AIchangey=1;
			}
		}
		map[plrCoordinates[0]][plrCoordinates[1]]=0; //deletes the old image of the player+AI
		map[AICoordinates[0]][AICoordinates[1]]=0;
		
		plrCoordinates[0]=(byte) (plrCoordinates[0]+changex); //updates the location
		plrCoordinates[1]=(byte) (plrCoordinates[1]+changey);
		
		AICoordinates[0]=(byte) (AICoordinates[0]+AIchangey); 
		AICoordinates[1]=(byte) (AICoordinates[1]+AIchangey);
		
		map[plrCoordinates[0]][plrCoordinates[1]]=2; //prints the new location
		map[AICoordinates[0]][AICoordinates[1]]=3;
		a=0; //resets the char to prevent infinite movement
	}

here is the move thing from another class:

	char move(){
		char c = 0;
		try {
			c = (char)System.in.read();	//records a key for movement
		} catch (IOException e) {
			e.printStackTrace();
		}
		return c;
	}

[czarcalvinsk]

also here is the error i get when i try to move:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -1
at pack.graphics.render(graphics.java:132)
at pack.main.run(main.java:11)
at pack.main.main(main.java:16)

line 132 is line 72 of the render code