Against which version of WF are you trying to run the HATimeService quickstart? This likely needs to be updated to work with WF9.
8.20. Final. i have thought to add custom classes HATimeService quickstart in Module (it impacts than order of class loading) and add this dependency in manifest, but it is perhaps no flexible or wrong solution.
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this partial case was problem with eclipse, deploy through wildfly plugin.
if application was deployed directly in server than there wasn't this exception. it seems that eclipse has deployed project with unknown differences - not maven built war.