import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import org.apache.commons.io.FileUtils;


public class Process {
    
    public ArrayList<String> fileLine = new ArrayList<String>();
    public ArrayList<String> dataLine = new ArrayList<String>();
    public File zap;
    public static int countLine = 0;
    
    public Process(String fileName) throws IOException{
        readFile(fileName);
    }
    
        private void readFile(String fname) throws IOException{
        
       
        
        File data = new File("fileinput/"+fname);
        fileLine = (ArrayList<String>) FileUtils.readLines(data);
        System.out.println("Обработка файла: "+fname);
        System.out.println("Строк в файле: " + fileLine.size());
        countLine += fileLine.size();
        
        for(int i=0; i<fileLine.size(); i++){
            if(fileLine.get(i).contains("R41-5000")){
                razbor(33, i, fname);
            }
            if(fileLine.get(i).contains("R43-4000")){
                razbor(28, i, fname);
            }
            
        }
        
    }
    
    /***
     * 
     * @param countLine сколько считать строк
     * @param z Номер обрабатываемой строки
     * @throws IOException 
     */
    private void razbor(int countLine, int z, String dirName)throws IOException{
        
        
                File dirrs = new File("cache/"+dirName);
                if(!dirrs.exists()){
                    dirrs.mkdir();
                }
        
                String fname = "";
                fileLine.set(z, fileLine.get(z).substring(fileLine.get(z).indexOf('R')));
                fname = fileLine.get(z).substring(0, fileLine.get(z).indexOf('.')+4);
                for(int x=z; x<=(z+countLine); x++)
                {
                    //////////////////////////
                   
                    if(dataLine.get(x).contains("ACID"))
                    {
                       String zam = "";
                       zam = dataLine.get(x+1).substring(4);
                       dataLine.set(x+1, zam);
                    }
                            
                    /////////////////////////////
                    dataLine.add(fileLine.get(x));
                }
                zap = new File("cache/"+dirName+"/"+fname);
                FileUtils.writeLines(zap, dataLine, "\n");
                dataLine.clear();
                
                //System.out.println(fileLine.get(z));
                System.out.println("Успешная запись файла: cache/"+dirName+"/" + fname);
                //System.out.println("*********************");
    }
    
}

Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 7148, Size: 0
	at java.util.ArrayList.rangeCheck(ArrayList.java:653)
	at java.util.ArrayList.get(ArrayList.java:429)
	at Process.razbor(Process.java:62)
	at Process.readFile(Process.java:34)
	at Process.<init>(Process.java:16)
	at Main.main(Main.java:36)
Java Result: 1

if(dataLine.get(x).contains("ACID"))

 if(dataLine.get(x).contains("ACID"))
                    {
                       String zam = "";
                       zam = dataLine.get(x+1).substring(4);
                       dataLine.set(x+1, zam);
                    }
                            
                    /////////////////////////////
                    dataLine.add(fileLine.get(x));