robe-auth/src/main/java/io/robe/auth/AbstractAuthResource.java
public T getUser(String accountName) {
        Optional<T> optional = (Optional<T>) userStore.findByUsername(accountName);
        if (optional.isPresent()) {
            return optional.get();
        } else {
            return null;
        }
    }
public T getUser(String accountName) {
        Optional<T> optional = (Optional<T>) userStore.findByUsername(accountName);
        if (optional.isPresent()) {
            return optional.get();
        } else {
            return null;
        }
    }
Returns the UserEntry matching the provided accountName.  If the accoundId is not found, an Anonymous
UserEntry or null may be returned.

@param accountName the account name
@return the matching UserEntry object, or the Null UserEntry if no match exists