code: public void dissociate() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              Tr.entry(tc, "dissociate");
          }
          if (WSSecurityHelper.isServerSecurityEnabled()) {
              J2CSecurityHelper.removeRunAsSubject();
          }
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              Tr.exit(tc, "dissociate");
          }
      }
docs: This method is called by the WorkProxy class to dissociate the inflown
  SecurityContext from the workmanager thread after it has run the work
  By the time this method is called, the WSSubject.doAs method call would
  have exited and the runAs subject would be dissociated. So all that is
  left to do here is to clear the ThreadLocal variable that is set with
  the runAs subject in the associate method.
  
  @return void