Hi

Right after SecurityUtils.getSubject().runAs(new new
SimplePrincipalCollection(){...})

SecurityUtils.getSubject().getPrincipal() returns correct new Principal
SecurityUtils.getSubject()..getPreviousPrincipals() returns correct original
Principal

but DefaultSubjectDAO merge principals in method

protected void mergePrincipals(Subject subject) {
  PrincipalCollection currentPrincipals = subject.getPrincipals();
  ...
  if (session == null) {
  ...
  } else {
    PrincipalCollection existingPrincipals = (PrincipalCollection)
session.getAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY);
    if (CollectionUtils.isEmpty(currentPrincipals)) {
      ...
    } else {
       if (!currentPrincipals.equals(existingPrincipals)) {
           
session.setAttribute(DefaultSubjectContext.PRINCIPALS_SESSION_KEY,
currentPrincipals);
      }
   }
}


and after that 
SecurityUtils.getSubject().getPrincipal() and
SecurityUtils.getSubject().getPreviousPrincipals() both returns new
Principal - this is wrong behavior 

Your thoughts and time on this will be of much help.
Thank you

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