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SWTBot() - Could not find a display - Eclipse 2020 [message #1834099]

Mon, 02 November 2020 11:10

Eclipse User

Hi,
I'm trying to use SWTBot on Eclipse and run into some trouble when following some tutorials and exemple.
On eclipse 2020-09 whenever I try to run a code I get an error due to the method SWTBot() to initialize the bot.
index.php/fa/39183/0/

It happened with several tutorials or exemple I followed, like these ones (can't give the url as i'm new):
SWTBot for testing Eclipse Applications - Tutorial - on vogella website
https://wiki.eclipse.org/SWTBot/UsersGuide
Testing SWT GUI with SWTBot - on StackOverflow

When trying these on a previous version of eclipse 2019-06 it works (or in vogella's exemple, the error are no longer due to the initialization of the bot but to missing elements in UI).
index.php/fa/39186/0/

About the code I'm testing:
For vogella it's the one in the section 4.3 Create Test
In the userGuide it's the one in section "Getting started with SWTBot for Eclipse Plugins"

About my run Configurations:
On the 2020 I tried with both JUnit plugin test and SWTBot Test. I was careful to not run the test in UI thread as said in documentation. I run the tests with java 1.8 and java 14.
On the 2019 version I tried only with the JUnit Plugin test and without thread UI, I run the tests with java 1.8.

So what I'm looking for is a way to run my tests with SWTBot on the 2020 version. I couldn't find any information about such error.
I will gladly provide more informations if you need.

Attachment: ErrorVogellaTest.PNG
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Attachment: ErrorSWTBotTest.PNG
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Attachment: VogellaOn2019Version.PNG
(Size: 60.32KB, Downloaded 543 times)
Attachment: SWTBotTestOn2019.PNG
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Re: SWTBot() - Could not find a display - Eclipse 2020 [message #1834370 is a reply to message #1834099]

Mon, 09 November 2020 03:37

Eclipse User

Turns out the problem was not due to a different version of eclipse but to a specific module in another project in my workspace. I remove it and now it's ok.

Re: SWTBot() - Could not find a display - Eclipse 2020 [message #1834466 is a reply to message #1834370]

Tue, 10 November 2020 14:26

Eclipse User

Hi Cedric,

Sorry for the late reply. I'm glad you resolved your problem and it's nice that you follow-up with the explanation of your issue.

Before I saw your response I was going to suggest to verify how your Run/Debug Configuration was setup, in Main > Program to Run.

We usually put Run a product: org.eclipse.platform.ide. It's the application that creates the display so if it was set to Run an application: Headless Mode then there is no display and we get the same error you reported.

Patrick

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