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https://issues.apache.org/jira/browse/VFS-778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17449831#comment-17449831
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Gary D. Gregory commented on VFS-778:
-------------------------------------
[~manishbansal8843]
I think this was recently fixed in git master by commit
[d2f6f34f9700bd66a226d2ceb1495ac0d4c8f223|https://github.com/apache/commons-vfs/commit/d2f6f34f9700bd66a226d2ceb1495ac0d4c8f223]
May you please try git master or a 2.10.0-SNAPSHOT build?
> SftpFileSystem returning null channel
> -------------------------------------
>
> Key: VFS-778
> URL: https://issues.apache.org/jira/browse/VFS-778
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.4.1, 2.5.0, 2.6.0
> Reporter: Manish Bansal
> Priority: Major
> Labels: pull-request-available
>
> I tested v2.4.1 jar with 8 threads. The purpose was to upload 1.3TB of data
> on FTP via sftp protocol. There were 850 folders with varying sizes from 10
> MB to 25GB. After the job was finished, It was observed that 50 folders
> failed to upload due to null pointer exception as below.
> {code:java}
> java.lang.NullPointerException: null
> at
> org.apache.commons.vfs2.provider.sftp.SftpFileObject.doGetOutputStream(SftpFileObject.java:475)
> at
> org.apache.commons.vfs2.provider.AbstractFileObject.getOutputStream(AbstractFileObject.java:1239)
> at
> org.apache.commons.vfs2.provider.DefaultFileContent.buildOutputStream(DefaultFileContent.java:518)
> at
> org.apache.commons.vfs2.provider.DefaultFileContent.getOutputStream(DefaultFileContent.java:404)
> at
> org.apache.commons.vfs2.provider.DefaultFileContent.getOutputStream(DefaultFileContent.java:392)
> at
> org.apache.commons.vfs2.provider.DefaultFileContent.write(DefaultFileContent.java:753)
> at
> org.apache.commons.vfs2.provider.DefaultFileContent.write(DefaultFileContent.java:771)
> at org.apache.commons.vfs2.FileUtil.copyContent(FileUtil.java:37)
> at
> org.apache.commons.vfs2.provider.AbstractFileObject.copyFrom(AbstractFileObject.java:295)
> at com.infy.task.helper.FTPUploader.uploadToFTP(FTPUploader.java:173)
> at com.infy.task.helper.FTPUploader.upload(FTPUploader.java:90)
> at
> com.infy.task.AssetDownloadAndUploadTask.run(AssetDownloadAndUploadTask.java:57)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> Further, I have analysed the code, it is very highly likely that it will
> return null due to below piece of code.
> {code:java}
> protected ChannelSftp getChannel() throws IOException {
> try {
> // Use the pooled channel, or create a new one
> ChannelSftp channel = null;
> if (idleChannel != null) {
> synchronized (this) {
> // What will happen if my code comes here and idleChannel is null
> if (idleChannel != null) {
> channel = idleChannel;
> idleChannel = null;
> }
> }
> } else {
> channel= .. //create channel
> }
> // some more code
> return channel;
> }
> {code}
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