How to get an impersonated Resolver in CQ5/AEM?

It is very easy to get an impersonated resolver:

Try the below code. Just pass the user id and resourceResolverFactory instance.

private ResourceResolver getImpersonatedResolver(final String userId) {
try {
return resourceResolverFactory.getAdministrativeResourceResolver(Collections.singletonMap(ResourceResolverFactory.USER_IMPERSONATION, (Object) userId));
} catch (LoginException e) {
throw new RuntimeException(e);
}
}

Source: https://cqwemblog.wordpress.com/2015/02/12/how-to-get-an-impersonated-resolver-in-cq5-aem/