Herwig,

Thanks for the detailed answers below. 

(def my-app (app
             wrap-stacktrace
             (wrap-file "resources/public/")
             [page] (-> (chrome page) response constantly)
             ["a" "b"] (-> "a b" response constantly))
             [&] (-> "Nothing was found" response (status 404) constantly)))

I have added another route /a/b, which also returns "Nothing was found" 
instead of "a b" ?

2012/9/7 Murtaza Husain <murtaza.hus...@sevenolives.com>
>
> (def my-app (app
>              wrap-stacktrace
>              (wrap-file "resources/public/")
>              [page] (-> (chrome page) response constantly)
>              [&] "Nothing was found"))
>
> I am getting a null pointer error on the route "/". Why is that ? Shouldnt 
> it give a 404 or something. Also why isnt it caught by the last route [&] ?
>
 
Hi Murtaza,

moustache handlers must be functions. So to return a string as a response, 
the last line would have to be

[&] (constantly "Nothing was found")

That however still wouldn't do what you expect, because the value returned 
from a handler has to be a response map like

[&] (constantly {:status 404 :body "Nothing was found"})

or 

[&] (-> "Nothing was found" response (status 404) constantly)

The auto response wrapping, that allows you to just return strings, is a 
convenience feature living in compojure, not ring.

If that resolves your problem, please consider reposting to the list, so 
that others may benefit.

kind regards


On Friday, September 7, 2012 4:18:28 PM UTC+5:30, Herwig Hochleitner wrote:
>
> In my experience, ring responds with 500 on error.
> You can use ring.middleware.stacktrace to make the error show up in the 
> browser.
>

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