More useful exception page

[He-Pin]

like this one have not gaven the root cause,

So I propose how about we show both the nearest exception , the root cause and clasp other exceptions between them?

like:

nearest exception 
....
clasped ,click to expand 
....

root cause

[He-Pin]

the root cause:playframework/play-json#100

[He-Pin]

https://github.com/playframework/playframework/blob/master/framework/src/play/src/main/scala/views/defaultpages/devError.scala.html

and the

def throwableToUsefulException(sourceMapper: Option[SourceMapper], isProd: Boolean, throwable: Throwable): UsefulException

play.api.http.HttpErrorHandlerExceptions#throwableToUsefulException

both need a little change,otherwise , useful is a little :)

[richdougherty]

Sounds like a good idea!