Affects Version/s: Nightly Builds
Fix Version/s: None
jdk1.5.0_07 / Linux
Newer versions of VFS seems to be unusable in multithreading environments, causing a deadlock of some kind. This causes my Java web server application to completely hang when there is many concurrent connections. My application uses a single FileSystemManager instance, and makes quite heavy use of VFS; opening many files from many threads simultaneously.
I have tried, without success different workarounds based on some mailing list threads:
- Using both NullReferenceFilesCache and the default SoftReferenceFilesCache. (SoftReferenceFilesCache seemed to sometimes cause some additional thread-related exceptions under heavy load, but propably unrelated to this issue)
- Using the new SynchorizedFileObjectDecorator also did not help. On the contrary, it seemed to trigger the deadlock more easily.
The version I have problems with is a nightly build: commons-vfs-20060831
The older version commons-vfs-20060115 works beautifully, but I would like to use newer version because I want to be able to use FileObject.refresh() to reset the internal state of files (specially, to get a fresh list of children).
I hope the threading issues are going to be resolved in near future, and I am willing to help in any way. I do not have very deep experience about multithreading applications, so I wasn't able to get more close to the roots of the issue. Feel free to ask for more information.