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From "Marty Lamb (JIRA)" <>
Subject [jira] Created: (VFS-107) large Sftp transfers fail with OutOfMemoryError: Java heap space
Date Mon, 15 Jan 2007 17:30:27 GMT
large Sftp transfers fail with OutOfMemoryError: Java heap space

                 Key: VFS-107
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: Nightly Builds
         Environment: java version "1.5.0_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
Java HotSpot(TM) Client VM (build 1.5.0_04-b05, mixed mode, sharing)

Linux version 2.6.17-1.2142_FC4 ( (gcc version 4.0.2
20051125 (Red Hat 4.0.2-8)) #1 Tue Jul 11 22:41:14 EDT 2006

            Reporter: Marty Lamb

Calling SftpFileObject.getOutputStream() returns a descendant of ByteArrayOutputStream; nothing
is written to the remote sftp server until the OutputStream is closed.  For large data transfers,
this exhausts local resources.

This is noted in the source for SftpFileObject:

	protected OutputStream doGetOutputStream(boolean bAppend) throws Exception
		// TODO - Don't write the entire file into memory. Use the stream-based
		// methods on ChannelSftp once the work properly
		final ChannelSftp channel = fileSystem.getChannel();
		return new SftpOutputStream(channel);

although it is not clear what "once the[y] work properly" is referring to.

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