Great suggestions, that is a good starting point to look at...

I wonder if anyone would want to take a crack at fixing the messaging to 
work as-expected in the kernel?  I am going to poll for resources 
internally to have a look at it - but if anyone else wanted to take a crack 
at it too...

https://github.com/apache/incubator-toree


On Tuesday, September 26, 2017 at 1:23:09 PM UTC-4, Robert Schroll wrote:
>
> On Sep 26 2017, at 10:08 am, Thomas Kluyver <[email protected] 
> <javascript:>> wrote: 
>
>> I'd make an educated guess that Toree is not signalling errors in the way 
>> you expect.
>>
>> I can confirm that the Toree kernel does not signal errors properly.  I 
> don't know what exactly it does wrong, but the notebook doesn't get outputs 
> of type "error" after problems occur.  Instead the stack traces appear in a 
> standard output cell.
>
> We ran into this problem in our notebook testing infrastruture.  Our 
> solution was to search for "StackTrace" in the output cell, and assume that 
> this indicated an error.  Maybe that would work for you?
>
> Robert
>
>

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