Java.nio.BufferUnderflowException when processing files in Scala

Question

I had a similar problem with this guy while processing a 4 MB log file . I actually process several files at the same time, but since I keep getting this exception, I decided to just test it for one file:

val temp = Source.fromFile("./datasource/input.txt")
val dummy = new PrintWriter("test.txt")
var itr = 0
println("Default Buffer size: " + Source.DefaultBufSize)
try {
    for( chr <- temp) {
        dummy.print(chr.toChar)
        itr += 1
        if(itr == 75703) println("Passed line 85")
        if(itr % 256 == 0){ print("..." + itr); temp.reset; System.gc; }
        if(itr == 75703) println("Passed line 87")
        if(itr % 2048 == 0) println("")
        if(itr == 75703) println("Passed line 89")
    }
} finally {
    println("\nFalied at itr = " + itr)
}

What I always get is that it will fail at itr = 75703, while my output file will always be 64 KB (more precisely 65536 bytes). No matter where I put temp.reset or System.gc, all experiments end up the same.

It seems that the problem depends on the memory allocation, but I can not find useful information about this problem. Any idea on how to solve this problem?

All your help is much appreciated.

EDIT: , , BufferedInputStream.

Answer 1

reset Source , ?

val temp = Source.fromFile("./datasource/input.txt")
try {
  for (line <- tem p.getLines) {
    //whatever
  }
finally temp.reset     

, . .