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https://issues.apache.org/jira/browse/VFS-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17046849#comment-17046849
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James Lentini commented on VFS-627:
-----------------------------------
Hi [~b.eckenfels], I didn't receive a response to the
[message|https://sourceforge.net/p/jsch/mailman/message/36872566/] that I
posted 2+ months ago on the jsch-users mailing list. Maybe nobody is reading
that email list anymore? Does anyone on the Apache VFS project know how to get
in touch with the folks at Jcraft? Alternatively, is there an alternative SFTP
provider for VFS?
> SFTP randomly hangs when copying a file on remote server
> --------------------------------------------------------
>
> Key: VFS-627
> URL: https://issues.apache.org/jira/browse/VFS-627
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.1
> Environment: Java 1.8.0_92
> VFS 2.1
> JSch 0.1.53
> Reporter: Henri Hagberg
> Priority: Major
>
> I have a process where a file is first copied over SFTP to local server and
> then on the remote server the file is copied to another location on that
> server for archiving. Both are done using {{FileObject#copyFrom}}. Now I've
> encountered twice the situation where during archiving (on remote server) the
> copy action hangs indefinitely (the process was left running for over 24
> hours). In both cases the issue happened when around 2000 files had been
> transferred (typical amount is under 100).
> The problem is difficult to reproduce since it doesn't always happen even
> with large number of files. Based on the stacktrace and random occurrences it
> might be a concurrency issue. The code using VFS however is single threaded.
> {code}
> Attaching to process ID 128021, please wait...
> Debugger attached successfully.
> Server compiler detected.
> JVM version is 25.92-b14
> Deadlock Detection:
> No deadlocks found.
> Thread 19073: (state = BLOCKED)
> Thread 128165: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=143 (Compiled
> frame)
> - org.apache.commons.vfs2.cache.SoftRefFilesCache$SoftRefReleaseThread.run()
> @bci=26, line=84 (Compiled frame)
> Thread 128164: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.io.PipedInputStream.awaitSpace() @bci=23, line=273 (Compiled frame)
> - java.io.PipedInputStream.receive(byte[], int, int) @bci=31, line=231
> (Compiled frame)
> - java.io.PipedOutputStream.write(byte[], int, int) @bci=77, line=149
> (Compiled frame)
> - com.jcraft.jsch.IO.put(byte[], int, int) @bci=7, line=64 (Compiled frame)
> - com.jcraft.jsch.Channel.write(byte[], int, int) @bci=7, line=438 (Compiled
> frame)
> - com.jcraft.jsch.Session.run() @bci=1260, line=1624 (Compiled frame)
> - java.lang.Thread.run() @bci=11, line=745 (Interpreted frame)
> Thread 128139: (state = BLOCKED)
> Thread 128138: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=143 (Compiled
> frame)
> - java.lang.ref.ReferenceQueue.remove() @bci=2, line=164 (Compiled frame)
> - java.lang.ref.Finalizer$FinalizerThread.run() @bci=36, line=209
> (Interpreted frame)
> Thread 128137: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - java.lang.Object.wait() @bci=2, line=502 (Compiled frame)
> - java.lang.ref.Reference.tryHandlePending(boolean) @bci=54, line=191
> (Compiled frame)
> - java.lang.ref.Reference$ReferenceHandler.run() @bci=1, line=153
> (Interpreted frame)
> Thread 128022: (state = BLOCKED)
> - java.lang.Object.wait(long) @bci=0 (Compiled frame; information may be
> imprecise)
> - com.jcraft.jsch.Session.write(com.jcraft.jsch.Packet,
> com.jcraft.jsch.Channel, int) @bci=89, line=1261 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp.sendWRITE(byte[], long, byte[], int, int)
> @bci=191, line=2619 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp.access$100(com.jcraft.jsch.ChannelSftp,
> byte[], long, byte[], int, int) @bci=9, line=36 (Compiled frame)
> - com.jcraft.jsch.ChannelSftp$1.write(byte[], int, int) @bci=77, line=791
> (Compiled frame)
> - java.io.BufferedOutputStream.write(byte[], int, int) @bci=20, line=122
> (Compiled frame)
> - org.apache.commons.vfs2.util.MonitorOutputStream.write(byte[], int, int)
> @bci=8, line=123 (Compiled frame)
> - java.io.BufferedOutputStream.flushBuffer() @bci=20, line=82 (Compiled
> frame)
> - java.io.BufferedOutputStream.write(byte[], int, int) @bci=39, line=126
> (Compiled frame)
> - org.apache.commons.vfs2.util.MonitorOutputStream.write(byte[], int, int)
> @bci=8, line=123 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(java.io.OutputStream,
> int) @bci=35, line=892 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(java.io.OutputStream)
> @bci=5, line=865 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(org.apache.commons.vfs2.FileContent)
> @bci=9, line=828 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.DefaultFileContent.write(org.apache.commons.vfs2.FileObject)
> @bci=7, line=849 (Compiled frame)
> -
> org.apache.commons.vfs2.FileUtil.copyContent(org.apache.commons.vfs2.FileObject,
> org.apache.commons.vfs2.FileObject) @bci=7, line=90 (Compiled frame)
> -
> org.apache.commons.vfs2.provider.AbstractFileObject.copyFrom(org.apache.commons.vfs2.FileObject,
> org.apache.commons.vfs2.FileSelector) @bci=148, line=338 (Compiled frame)
> ...
> {code}
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