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:[EMAIL PROTECTED]/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:[EMAIL PROTECTED]/".
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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