Java Memory Management with BufferedReader

Question

Is it possible to add memory in JVM more than 5GB if the machine has installed memory 2GB only?

Because I got exception in thread, java.lang.OutOfMemoryError: Java heap space

I'm reading a text file which contains Strings that sized by 5gb, and I used BufferedReader to read lines.

Is it strictly necessary to load all of the file into memory? Can you simply process portions of the file at a time? — MadConan, Apr 08 '15 at 23:58
http://stackoverflow.com/questions/3648454/what-happens-if-you-specify-max-heap-size-greater-than-available-ram might provide some pointers. — Andy Turner, Apr 08 '15 at 23:58
Not really, the data of the file is like 20 words per line. And I just need the 4 first word of that line. — tuturyokgaming, Apr 09 '15 at 00:12

score 0 · Answer 1 · answered Apr 09 '15 at 01:38

0

Just process the data a line at a time, with readLine() and friends, maybe even a Scanner. It is never necessary to load a large file entirely into memory.

answered Apr 09 '15 at 01:38

user207421

305,947
44
307
483

I'm storing the data line by line to ArrayList. But I think String variable can't hold more than 1m line. – tuturyokgaming Apr 09 '15 at 11:50

Java Memory Management with BufferedReader

1 Answers1