memory heap exception in eclipse and array index out of bounds exception.

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I am writing a program in java to merge any number of files (Only files not directories)into a single file and split them when ever needed.

here is the code I have written.

package com.vim.jy;
import java.io.BufferedOutputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class MergeFile
{
	FileInputStream fis;
	FileOutputStream fos;
	DataInputStream dis;
	BufferedOutputStream bos;
	File file=new File("D:\\Test\\Input\\");
	File[] file_Names;
	int i=0, ltc, file_Size, count_Files; // ltc=Length to copy till how many bytes 
	byte[] rw_Buffer,con_Str_Bt_Arr;
	int size;
	MergeFile() throws Exception
	{	
		System.out.println("Enter into MergeFile  method");
		file_Names=file.listFiles();
		if(file_Names!=null)
		{
			System.out.println("got file names frm "+ file+" folder ");
		}
		
		count_Files=file_Names.length;
		System.out.println("the total number of files in the path "+ file +" : "+count_Files);
		System.out.println("File names: ");
		
		for (int i = 0; i < file_Names.length; i++)
		{
			System.out.println(file_Names[i]+"\t");
		}
		
		if(count_Files!=0)
		{
			System.out.println("got file number  \n");
		}
		
		
		System.out.println("The number of files in the input folder to merge  "+count_Files + "\n");
		
		fos= new FileOutputStream("D:\\Test\\Output\\Out.dat"); // outputs file file location stores
		if(fos!=null)
		{
			System.out.println("fos created "+fos);
		}
		
		
		bos=new BufferedOutputStream(fos);
		if(bos!=null)
		{
			System.out.println("bos created "+bos);
		}
		
		
		size=0;
		rw_Buffer=new byte[999000]; // read and write buffer size
		if(rw_Buffer!=null)
		{
				System.out.println("byte array created "+rw_Buffer);
		}
		
		
		
		int sl;
		while(count_Files>0)
		{
			System.out.println("Entring into while loop");
			String scrFile=file_Names[i].getName();
			System.out.println("<<<<<----->>"+scrFile);

		
			if(scrFile!=null)
			{
				System.out.println("the file name is "+scrFile);
			}
		
			fis=new FileInputStream("D:\\Test\\Input\\"+scrFile);
			if(fis!=null)
			{
				System.out.println("fis is "+fis);
			}
			
			
			dis=new DataInputStream(fis);
			if(dis!=null)
			{
				System.out.println("dis is "+dis);
			}
			
			
			sl=scrFile.length();
			if(sl!=0)
			{
				System.out.println("sl is "+sl);
			}
			
			
			bos.write(sl);
			if(bos!=null)
			{
				System.out.println("bos is written   "+bos);
			}
			else
			{
				System.out.println("bos not  written"+bos);
			}
			con_Str_Bt_Arr=scrFile.getBytes();   //convetting file name in string to byte array 
			if(con_Str_Bt_Arr!=null)
			{
				System.out.println("con_Str_Bt_Arr soruce file is conveted to bytes   "+con_Str_Bt_Arr);
			}
			else
			{
				System.out.println("con_Str_Bt_Arr soruce file not conveted to bytes   "+con_Str_Bt_Arr);
			}
			ltc=con_Str_Bt_Arr.length;			// name lenght
			
			bos.write(con_Str_Bt_Arr,0,ltc);		//adding file name to *.dat file
			file_Size=dis.available();		//content size in file 
			bos.write(file_Size);				//adding content size
			size=size+file_Size;
			System.out.println("----------->>>>"+size);
			file_Size=dis.available();
			dis.readFully(rw_Buffer,0,file_Size);		//reading data from files in bytes
			System.out.println("->>> dis.readFully");
			bos.write(rw_Buffer,0,file_Size);			//writing data to files in bytes
			size=size+file_Size;
			count_Files--;
			i++;
		}
		close();  
		
		
		return;
	}
	public void close() throws Exception
	{
		bos.flush();
		bos.close();
		fos.close();
		
	}
	public static void main(String[] args) throws Exception
	{
		System.out.println("enter main \n");
		new MergeFile();
		System.out.println("exit main  \n");
	}
}

the issue is that when ever I execute this program for files of large size, it is throwing an exception

Exception in thread "main" java.lang.IndexOutOfBoundsException
    at java.io.FileInputStream.readBytes(Native Method)
    at java.io.FileInputStream.read(Unknown Source)
    at java.io.DataInputStream.readFully(Unknown Source)
    at com.vim.jy.MergeFile.<init>(MergeFile.java:128)
    at com.vim.jy.MergeFile.main(MergeFile.java:150)

or memory heap...... (something)

how to fix this??

after this, I need to split the files to the original files.
All this should be done in byte streams

I just don't want to ignore the exception. I need to fix this excetption, memory heap in eclipse (community version) and the reason for this.

* this memory heap ...(something) exception comes when operating on large files of total size (scrFile size) >800KB and 1mb<<