I don't understand why this simple method does not work

My class `AccessChecker` has the attribute `Hashtable<String, List<Permission>> permissions = new Hashtable<String, List<Permission>>();` with two methods:

**First method**

If I put `this.permissions.containsKey(key)` at the end of this method , with a good key, it works.

```
public void updatePermissions() {
    List<Permission> permissionsTmp = permissionRepository.findAllWithEagerRelationships();

    // clear permissions
    this.permissions = new Hashtable<>();

    // load all permissions
    for (Permission permission : permissionsTmp) {
        Profil profil = profilRepository.findOne(permission.getProfil().getId());
        permission.setProfil(profil);
        UserFonc user = userFoncRepository.findOne(permission.getUserFonc().getId());
        permission.setUserFonc(user);

        log.error("updatePermissions ** user login = " + user.getNom());

        for (WebService webService: profil.getWebServices()) {
            String key = createKeyPermissions(user.getNom().toLowerCase(), webService.getNom(), webService.getMethode());
            log.error("updatePermissions ** key = " + key);
            if (this.permissions.containsKey(key)){
                this.permissions.get(key).add(permission);
            }
            else {
                List<Permission> newPermissions = new ArrayList<>();
                newPermissions.add(permission);
                this.permissions.put(key, newPermissions);
            }

        }
    }
}

```

**Second method**

But, when I do this in method `hasAccessToWebservice()`, it does NOT work for the same key...

```
public boolean hasAccessToWebservice(HttpServletRequest request) {
    boolean hasAccess = false;

    String webservice = getServiceFromRequest(request);
    String methode = request.getMethod();
    String login = SecurityUtils.getCurrentUserLogin();
    String userAgent = request.getHeader(Constants.USER_AGENT);

    final String userLogin = SecurityUtils.getCurrentUserLogin();
    log.error("hasAccessToWebservice ** user login = " + userLogin);

    String key = createKeyPermissions(login.toLowerCase(), webservice, methode);
    log.error("hasAccessToWebservice ** key = " + key);

    log.error("hasAccessToWebservice ** element = " + this.permissions.size());

    Set t = this.permissions.keySet();
    log.error(t.toString());

    if (this.permissions.containsKey(key)) {
        log.error("hasAccessToWebservice ** key found !!");
        hasAccess = true;
    }
    return hasAccess;
}

```

Can you explain why?

Thank you