Can't use PullRequestService.find method with SecurityService

doWithPermissions(securityService,
    "Get all open pull-requests in attempt to merge them",
    Lists.newArrayList(Permission.REPO_READ, Permission.LICENSED_USER),
    findOp(pullRequestService, authenticationContext));

private static <T, E extends RuntimeException> T doWithPermissions(
        final SecurityService securityService,
        final String reason,
        final List<Permission> permissions,
        final Operation<T, E> op) {
    Permission permission = permissions.get(0);
    List<Permission> permissionsTail = permissions.subList(1, permissions.size());
    if (permissionsTail.size() > 0) {
        return securityService.doWithPermission(reason, permission,
                doWithPermissionsOp(securityService, reason, op, permissionsTail));
    }
    return securityService.doWithPermission(reason, permission, op);
}

private static <T, E extends RuntimeException> Operation<T, E> doWithPermissionsOp(
        final SecurityService securityService,
        final String reason,
        final Operation<T, E> delegate,
        final List<Permission> permissions) {
    return new Operation<T, E>() {
        @Override
        public T perform() throws E {
            return doWithPermissions(securityService, reason, permissions, delegate);
        }
    };
}