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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 22304] New: - FTPClient.listFiles intermittently locks up
Date Mon, 11 Aug 2003 14:27:08 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=22304

FTPClient.listFiles intermittently locks up

           Summary: FTPClient.listFiles intermittently locks up
           Product: Commons
           Version: 1.0 Final
          Platform: All
        OS/Version: Other
            Status: NEW
          Severity: Critical
          Priority: Other
         Component: Net
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: matthew@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?

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)

Found using Windows 2000 with Sun's 1.4.2 VM.

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