Read File in chunks and then read line by line using LineNumberReader. Repeat this activity

Read File in chunks and then read line by line using LineNumberReader.
Repeat this activity

I have a file containing some 6.5 lakh lines. Now I wish to read every
line of this file using LineNumberReader.
However I am encountering an outofMemoryError on adding these many number
of lines to another 3rd party library..
What I intend to do is, read 200000 lines of a file at a time and add
these lines to 3rd party library.
I am using LineNumberReader but I think the entire file is being read
although I have provided condition that when line count reaches 200000
break the loop and add these to 3rd party library..
A code snippet for the same:
LineNumberReader lnr=new LineNumberReader(new FileReader(file));
String line=null;
int i=0;
while(flags)
{
while( null != (line = lnr.readLine()) ){
i++;
3rdPartyLibrary.add(line.trim());
if(i==200000)
{
System.out.println("Breaking");
lnr.mark(i);
break;
}
if(i==400000)
{
System.out.println("" );
lnr.mark(i);
break;
}
if(i==600000)
{
System.out.println("BREAKING " );
lnr.mark(i);
break;
}
}
if(line==null)
{
System.out.println(" FLAG");
flags=false;
}
lnr.reset();
}
What I am intending to do here is read file from 0-200000 in first
iteration. Then read each individual line and add to 3rd party lib.. Once
this is done, read another 200000 lines from (200001-400000) and then
repeat the same activity.
Need help..Can someone please guide..