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From "Harald Brabenetz (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (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 Mon, 06 Aug 2007 06:17:59 GMT

    [ https://issues.apache.org/jira/browse/VFS-120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12517830
] 

brabenetz edited comment on VFS-120 at 8/5/07 11:17 PM:
---------------------------------------------------------------

Try to replace the:
------------------------------------------------------------------------
manager = VFS.getManager()
..... //do something
------------------------------------------------------------------------

through:

------------------------------------------------------------------------
StandardFileSystemManager manager = new StandardFileSystemManager();
manager.init();

try {
    ..... //do something
} finally {
    manager.close();
    manager = null;
}
------------------------------------------------------------------------
 



      was (Author: brabenetz):
    Try to replace the:
------------------------------------------------------------------------
------
manager = VFS.getManager()
------------------------------------------------------------------------
------

through:

------------------------------------------------------------------------
------
StandardFileSystemManager manager = new StandardFileSystemManager();
manager.init();

try {
    ..... //do something
} finally {
    manager.close();
    manager = null;
}
------------------------------------------------------------------------
------
 


  
> 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
>         Attachments: SftpFileSystem-patch.txt
>
>
> 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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