jaas/src/main/java/com/yubico/jaas/YubikeyLoginModule.java
public boolean logout() throws LoginException {
		log.trace("In logout()");
		for (YubikeyPrincipal p : this.principals) {
			this.subject.getPrincipals().remove(p);
		}
		return false;
	}
public boolean logout() throws LoginException {
		log.trace("In logout()");
		for (YubikeyPrincipal p : this.principals) {
			this.subject.getPrincipals().remove(p);
		}
		return false;
	}
/* (non-Javadoc)
@see javax.security.auth.spi.LoginModule#logout()