Using ServletOutputStream to write very large files in a Java servlet without memory issues

Question

I am using IBM Websphere Application Server v6 and Java 1.4 and am trying to write large CSV files to the ServletOutputStream for a user to download. Files are

Answer 1

your code has an infinite loop.

do
{
    bytesRead = inputStream.read(buffer, offset, buffer.length);
    resp.getOutputStream().write(buffer, 0, bytesRead);
}
while (bytesRead == buffer.length);

offset has the same value thoughout the loop, so if initially offset = 0, it will remain so in every iteration which will cause infinite-loop and which will leads to OOM error.