Yes, please file an issue with the Toree kernel community:
https://issues.apache.org/jira/projects/TOREE

or bring it up on the dev list.

On Tuesday, September 26, 2017 at 10:33:05 AM UTC-7, takowl wrote:
>
> Has someone filed an issue on the Toree kernel to work out a proper fix 
> from their side?
>
> On 26 September 2017 at 18:23, Robert Schroll <[email protected] 
> <javascript:>> 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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