oracle.security.jps.service.idstore.IdentityStoreException: JPS-01520: Cannot initialize identity store.
<IdentityStoreUtil> <getIdentityStoreFactory> Cannot initialize identity store.
<PageUtils> <getUserName> Failed to get user name
If you happen to get the error while running the weblogic server then the possible cause can be to add the entry in config.xml (\Users\username\AppData\JDeveloper\system11.1.1.5.37.60.13\DefaultDomain\config\config.xml)
<listen-address>localhost</listen-address>
that is the localhost is missing.
related forum is
https://forums.oracle.com/forums/thread.jspa?threadID=2177694
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