Simone created NET-685:
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Summary: 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
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)
Thanks in advance,
Simone
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