I think the problem is the method Configuration.getConfiguration is not synchronized.
 
The error message is logged as (only occured when concurrently executing action at first time):
 
Could not execute action
com.opensymphony.xwork.config.ConfigurationException: There is no Action mapped for action name ListFolders
        at com.opensymphony.xwork.DefaultActionProxy.<init>(DefaultActionProxy.java:75)
        at com.opensymphony.xwork.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:40)
        at com.opensymphony.webwork.dispatcher.ServletDispatcher.service(ServletDispatcher.java:163)

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