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From Tamás Faragó (JIRA) <j...@apache.org>
Subject [jira] [Created] (WW-4986) Race condition reloading config results in actions not found
Date Thu, 22 Nov 2018 10:43:00 GMT
Tamás Faragó created WW-4986:
--------------------------------

             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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