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From "Harald Brabenetz (JIRA)" <j...@apache.org>
Subject [jira] Created: (VFS-120) SFTP-Exception: "com.jcraft.jsch.JSchException: session is down" if the SFTP-Server was killed and restarted (a normal shutdown of the SFTP-Server occured no Exception after restart.)
Date Fri, 30 Mar 2007 09:05:25 GMT
SFTP-Exception: "com.jcraft.jsch.JSchException: session is down" if the SFTP-Server was killed
and restarted (a normal shutdown of the SFTP-Server occured no Exception after restart.)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: VFS-120
                 URL: https://issues.apache.org/jira/browse/VFS-120
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 1.0
         Environment: Tomcat 5.5
JDK 6.0 (build with JDK 5)

commons-vfs-1.0.jar:
Specification-Title: Commons VFS
Implementation-Version: 1.0

JSCH: jsch-0.1.31.jar
            Reporter: Harald Brabenetz
            Priority: Critical


The error occured after restarting if the SFTP-Server was KILLed!!.
With a normal shutdown of the SFTP-Server, no exception after restarting occured.

I found no function to force the reset of the session in SftpFileSystem.java
There is a function:
    DefaultFileSystemManager manager = (DefaultFileSystemManager)VFS.getManager();
    manager.freeUnusedResources();
But this works only if AbstractFileSystem.isReleaseable() returns true.
And this this function return only true if all SFTP-FileObject are removed from the GarbageCollection
(finally()-Methode).
I cannot force a GarbageCollection.
So there is no way to handle this Error! I must restart the VM (ServletContainer).

org.apache.commons.vfs.FileSystemException: Could not copy "file:///C:/TEMP/....." to "sftp://......".
        at org.apache.commons.vfs.provider.AbstractFileObject.copyFrom(AbstractFileObject.java:902)
        at com.bearingpoint.orf.chat.core.service.ExportManagerImpl.exportChatMessages(Unknown
Source)
        at com.bearingpoint.orf.chat.core.service.ExportManagerImpl.startExportNow(Unknown
Source)
        at com.bearingpoint.orf.chat.core.service.ExportManagerImpl$ExportManagerRunnable.run(Unknown
Source)
        at java.lang.Thread.run(Thread.java:595)
Caused by: org.apache.commons.vfs.FileSystemException: Could not write to "sftp://chat:chat@10.1.5.130/home/chat/chatfile_12.zip".
        at org.apache.commons.vfs.provider.AbstractFileObject.getOutputStream(AbstractFileObject.java:1227)
        at org.apache.commons.vfs.provider.DefaultFileContent.getOutputStream(DefaultFileContent.java:373)
        at org.apache.commons.vfs.provider.DefaultFileContent.getOutputStream(DefaultFileContent.java:356)
        at org.apache.commons.vfs.FileUtil.copyContent(FileUtil.java:100)
        at org.apache.commons.vfs.provider.AbstractFileObject.copyFrom(AbstractFileObject.java:893)
        ... 4 more
Caused by: org.apache.commons.vfs.FileSystemException: Could not connect to SFTP server at
"sftp://chat:chat@10.1.5.130/".
        at org.apache.commons.vfs.provider.sftp.SftpFileSystem.getChannel(SftpFileSystem.java:144)
        at org.apache.commons.vfs.provider.sftp.SftpFileObject.doGetOutputStream(SftpFileObject.java:402)
        at org.apache.commons.vfs.provider.AbstractFileObject.getOutputStream(AbstractFileObject.java:1219)
        ... 8 more
Caused by: com.jcraft.jsch.JSchException: session is down
        at com.jcraft.jsch.Session.openChannel(Session.java:756)
        at org.apache.commons.vfs.provider.sftp.SftpFileSystem.getChannel(SftpFileSystem.java:122)
        ... 10 more

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