RFR 8153716: JShell tool: should warn when failed to launch editor

[Robert Field]

Fix pushed!

The link you provided lead me to the property.  Which meant a test could 
be written with:

     System.setProperty("java.awt.headless", "true")

-Robert

On 04/08/16 01:49, KUBOTA Yuji wrote:
> Sorry, I do not have an idea to reproduce within Java. I checked some
> tests which may be related with headless, e.g.,
> jdk/test/java/awt/Toolkit/Headless/HeadlessToolkit.java. But they
> require to run in headless mode.
>
> Thanks,
> Yuji
>
> 2016-04-08 15:47 GMT+09:00 Robert Field <robert.field at oracle.com>:
>> It will need a regression test, if possible.  Is there a way to reproduce
>> this exception within Java?  Make Java think it is headless?
>>
>> Thanks,
>> Robert
>>
>>
>>
>>
>>
>>
>> On April 7, 2016 11:36:10 PM Robert Field <robert.field at oracle.com> wrote:
>>
>>> Nice. I'll push in the morning.
>>>
>>> -Robert
>>>
>>>
>>> On April 7, 2016 11:25:22 PM KUBOTA Yuji <kubota.yuji at gmail.com> wrote:
>>>
>>>> Hi Robert,
>>>>
>>>> Thanks for comment. Certainly for users, "something happen" is very
>>>> unkind.
>>>>
>>>> I updated my patch to show the exception message:
>>>>   http://cr.openjdk.java.net/~ykubota/8153716/webrev.01/
>>>>
>>>> Thanks,
>>>> Yuji
>>>>
>>>> 2016-04-08 1:14 GMT+09:00 Robert Field <robert.field at oracle.com>:
>>>>> Yuji,
>>>>>
>>>>> Looks good, I wonder if showing the exception (or the exception message)
>>>>> would be useful, rather than just a mystery of it not launching?   For
>>>>> example, seeing that it is headless.
>>>>>
>>>>> -Robert
>>>>>
>>>>>
>>>>> On 04/07/16 02:04, KUBOTA Yuji wrote:
>>>>>>
>>>>>> I filed the proposal which reported at below:
>>>>>> http://mail.openjdk.java.net/pipermail/kulla-dev/2016-April/001305.html
>>>>>>
>>>>>> Bug:
>>>>>>     https://bugs.openjdk.java.net/browse/JDK-8153716
>>>>>>
>>>>>> Webrev:
>>>>>>     http://cr.openjdk.java.net/~ykubota/8153716/webrev.00/
>>>>>>
>>>>>> I'm an author, not committer, so I need sponsor.
>>>>>> Please review it.
>>>>>>
>>>>>> Thanks,
>>>>>> Yuji
>>>>>
>>>>>
>>