Perform a specific operation as a privileged user

[Nicolas Antoniazzi]

Hello,

I do not know exactly how to run a specific operation during my process as a
priviliged user.
Here is my example where I am logged as a normal user

public void createMyEntity() {
  myDao.insert(entityToSave); // Operation that can be performed by a normal
user

  if(entityToSave.hasSpecialProperty()) {
    myDao.updateSpecialProperty(entityToSave); // Operation that has to be
performed by special user
  }
}

I wanted to use SecurityUtil.getSubject().runAs(), but I do not know how to
retrieve PrincipalCollections associated to my special user.
How could I do this ?

Thanks,

Nicolas.