docs: public static JcrAccessControlList defaultAcl( AccessControlManagerImpl acm ) {
          JcrAccessControlList acl = new JcrAccessControlList("/");
          try {
              acl.principals.put(SimplePrincipal.EVERYONE, new AccessControlEntryImpl(SimplePrincipal.EVERYONE, acm.privileges()));
          } catch (AccessControlException e) {
              // will never happen
          }
          return acl;
      }