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https://issues.apache.org/jira/browse/NET-685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17169313#comment-17169313
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Sebb commented on NET-685:
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There is a simple solution to the issue: just set a timeout, so this is not a
blocker.
> FTPClient.connect() hangs without any timeout and response. It blocks the
> whole JVM
> -----------------------------------------------------------------------------------
>
> Key: NET-685
> URL: https://issues.apache.org/jira/browse/NET-685
> Project: Commons Net
> Issue Type: Bug
> Components: FTP
> Affects Versions: 3.6
> Environment: *OS:* Debian 9
> *Java Version:* 1.8
> *Scheduler:* On made development using Spring-boot. Multithreading
> Environment using Runnable Class.
>
> Reporter: Simone
> Priority: Minor
> Attachments: ProductionLogsApache.txt
>
>
> Hello Everybody,
> we implemented a multithread scheduler in order to run many FTP connections
> (one for each customer). We use these connections to upload /download files
> from/to remote servers.
> Inside the scheduler, we use a ScheduledThreadPoolExecutor to run our FTP
> connections (about 50). We run one thread (which instantiates an FTPClient
> object) for each FTP connection.
> Sometimes, one of those connections tries to connect to the FTP server and
> the method FTPClient.connect() hangs without any timeout. No log. No server
> response.
> The connection is blocked as well as the whole JVM.
> We needed to restart the service to fix the production.
> We already checked the following points during the issue:
> - the server is reachable;
> - No overlapping between run threads;
> - the virtual machine runs correctly;
> - Every other connection works correctly (FTPS, SFTP, CIFS, ...) so far.
> (Production logs attached)
> PULL-REQUEST link: [https://github.com/apache/commons-net/pull/51]
> Thanks in advance,
> Simone
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