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https://issues.apache.org/jira/browse/VFS-839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17742198#comment-17742198
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Gary D. Gregory commented on VFS-839:
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当缓存的文件被全部清理后，会自动停止SoftRefReleaseThread线程，停止线程会清空fileSystemCache，softRefReleaseThread变量设为null，再将原来的线程中断，且线程安全；但是在停止SoftRefReleaseThread线程过程中，可能有新的线程从缓存获取文件，在
getOrCreateFilesystemCache方法中，当fileSystemCache为空时，会去启动新的SoftRefReleaseThread线程，但中断线程的方法还未将softRefReleaseThread变量设为null，线程不能被启动，且将fileSystem作为key放到fileSystemCache变量，非线程安全；导致SoftRefReleaseThread线程再也不能自动启动；
整体执行步骤见下图：
Dāng huǎncún de wénjiàn bèi quánbù qīnglǐ hòu, huì zìdòng tíngzhǐ
SoftRefReleaseThread xiànchéng, tíngzhǐ xiànchéng huì qīngkōng
fileSystemCache,softRefReleaseThread biàn liáng shè wèi null, zài jiāng yuánlái
de xiànchéng zhōngduàn, qiě xiànchéng ānquán; dànshì zài tíngzhǐ
SoftRefReleaseThread xiànchéng guòchéng zhōng, kěnéng yǒu xīn de xiànchéng cóng
huǎncún huòqǔ wénjiàn, zài
getOrCreateFilesystemCache fāngfǎ zhōng, dāng fileSystemCache wèi kòng shí, huì
qù qǐdòng xīn de SoftRefReleaseThread xiànchéng, dàn zhōngduàn xiànchéng de
fāngfǎ hái wèi jiāng softRefReleaseThread biàn liáng shè wèi null, xiànchéng
bùnéng bèi qǐdòng, qiě jiāng fileSystem zuòwéi key fàng dào fileSystemCache
biànliàng, fēi xiànchéng ānquán; dǎozhì SoftRefReleaseThread xiànchéng zài yě
bùnéng zìdòng qǐdòng;
zhěngtǐ zhíxíng bùzhòu jiàn xià tú:
When all the cached files are cleared, the SoftRefReleaseThread thread will be
automatically stopped, the fileSystemCache will be cleared when the thread is
stopped, the softRefReleaseThread variable will be set to null, and the
original thread will be interrupted, and the thread is safe; but during the
process of stopping the SoftRefReleaseThread thread, there may be new The
thread fetches the file from the cache, in
In the getOrCreateFilesystemCache method, when the fileSystemCache is empty, a
new SoftRefReleaseThread thread will be started, but the method of interrupting
the thread has not yet set the softRefReleaseThread variable to null, the
thread cannot be started, and the fileSystem is used as the key in the
fileSystemCache variable, which is not thread-safe ;cause the
SoftRefReleaseThread thread can no longer be automatically started;
The overall execution steps are shown in the figure below:
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> SoftRefReleaseThread线程close后，不能再次自动启动
> -------------------------------------
>
> Key: VFS-839
> URL: https://issues.apache.org/jira/browse/VFS-839
> Project: Commons VFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Environment: CentOS 7.4
> JDK 1.8
> Reporter: fanshu
> Priority: Major
> Attachments: image-2023-07-11-10-07-44-143.png
>
>
> 当缓存的文件被全部清理后，会自动停止SoftRefReleaseThread线程，停止线程会清空fileSystemCache，softRefReleaseThread变量设为null，再将原来的线程中断，且线程安全；但是在停止SoftRefReleaseThread线程过程中，可能有新的线程从缓存获取文件，在
> getOrCreateFilesystemCache方法中，当fileSystemCache为空时，会去启动新的SoftRefReleaseThread线程，但中断线程的方法还未将softRefReleaseThread变量设为null，线程不能被启动，且将fileSystem作为key放到fileSystemCache变量，非线程安全；导致SoftRefReleaseThread线程再也不能自动启动；
> 整体执行步骤见下图：
> !image-2023-07-11-10-07-44-143.png!
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