[net] FTPClient.listFiles sometimes locks up

["Matthew J. Simoneau" <ma...@mathworks.com>]

FTPClient.listFiles intermittently locks up on me, about every couple
dozen times I call it.  I can reproduce this with the 1.0 release and with
last night's build.  When I attach a debugger and look at the stack traces
(below), I see that DefaultFTPFileListParser.parseFileList calls
BufferedReader.readLine.  Is it possible that due to networking hiccups,
readLine isn't getting its end-of-line and it never times out?  Is there
something else going on?  Has anyone else seen this problem?

Thanks for your help.

Using the 1.0 version:

main:
  [1] java.net.SocketInputStream.socketRead0 (native method)
  [2] java.net.SocketInputStream.read (null)
  [3] sun.nio.cs.StreamDecoder$CharsetSD.readBytes (null)
  [4] sun.nio.cs.StreamDecoder$CharsetSD.implRead (null)
  [5] sun.nio.cs.StreamDecoder.read (null)
  [6] java.io.InputStreamReader.read (null)
  [7] java.io.BufferedReader.fill (null)
  [8] java.io.BufferedReader.readLine (null)
  [9] java.io.BufferedReader.readLine (null)
  [10] org.apache.commons.net.ftp.DefaultFTPFileListParser.parseFileList
(DefaultFTPFileListParser.java:397)
  [11] org.apache.commons.net.ftp.FTPClient.listFiles
(FTPClient.java:1,933)
  [12] org.apache.commons.net.ftp.FTPClient.listFiles
(FTPClient.java:1,964)
  [13] org.apache.commons.net.ftp.FTPClient.listFiles
(FTPClient.java:2,020)

Using last night's build:

main:
  [1] java.net.SocketInputStream.socketRead0 (native method)
  [2] java.net.SocketInputStream.read (null)
  [3] sun.nio.cs.StreamDecoder$CharsetSD.readBytes (null)
  [4] sun.nio.cs.StreamDecoder$CharsetSD.implRead (null)
  [5] sun.nio.cs.StreamDecoder.read (null)
  [6] java.io.InputStreamReader.read (null)
  [7] java.io.BufferedReader.fill (null)
  [8] java.io.BufferedReader.readLine (null)
  [9] java.io.BufferedReader.readLine (null)
  [10] org.apache.commons.net.ftp.DefaultFTPFileListParser.parseFileList
(DefaultFTPFileListParser.java:395)
  [11] org.apache.commons.net.ftp.FTPClient.listFiles
(FTPClient.java:1,985)
  [12] org.apache.commons.net.ftp.FTPClient.listFiles
(FTPClient.java:2,016)
  [13] org.apache.commons.net.ftp.FTPClient.listFiles
(FTPClient.java:2,072)


--
Matthew J. Simoneau
The MathWorks, Inc.