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Posted to issues@struts.apache.org by "Tamás Faragó (JIRA)" <ji...@apache.org> on 2018/11/22 10:43:00 UTC
[jira] [Created] (WW-4986) Race condition reloading config results
in actions not found
Tamás Faragó created WW-4986:
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Summary: Race condition reloading config results in actions not found
Key: WW-4986
URL: https://issues.apache.org/jira/browse/WW-4986
Project: Struts 2
Issue Type: Bug
Components: XML Configuration
Affects Versions: 2.5.18
Reporter: Tamás Faragó
Fix For: 2.5.x
Issue only occurs when the following xml configuration is present :
“struts.configuration.xml.reload” is enabled.
The reload flag is supposed to reload the xml configuration when it changes. To this end it calls the synchronized method com.opensymphony.xwork2.config.impl.DefaultConfiguration::reloadContainer. This clears out the packageContext map. The issue is that this operation is not thread safe as none of the other accessors of this map (for example com.opensymphony.xwork2.config.impl.DefaultConfiguration::getPackageConfigs which is the cause of the disappearing actions) is not synchronized .
A solution would be totally rebuild the context into a separate temporary object and reassign it at the end.
To make matters worse is that this reloading happens on almost every single request due to some other race condition which I haven't figured out yet.
For some reason DefaultFileManagerFactory (which is not a singleton) fails to properly set DefaultFileManagerFactory::setReloadingConfigs from the XML thus reloadConfigs is false which causes DefaultFileManager::setReloadingConfigs to be false, which means that when struts doesn’t monitor files (DefaultFileManager::monitorFile) and the files cache is empty.
Now this would work, but the code that calls DefaultFileManager::fileNeedsReloading and DefaultFileManager::loadFile is a different instance of this class, where the first one has reloadingConfigs set to true, and in the second one to false.
Somewhere in XWorkConverter::SetFileManagerFactory > DefaultFileManagerFactory::getFileManager > DefaultFileManager::setReloadingConfigs using the same stack (at least to this level) the configuration is not read properly.
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