[jbosstools-dev] SWTBot 2.1 is available... should we upgrade?

[Mickael Istria]

On 04/08/2013 11:40 AM, Martin Malina wrote:
> Hi Mickael,
> Today we started testing JBT 4.1.0.Alpha2 and noticed that this is 
> quite a big problem for us. Most of our tests fail with something like 
> this:
>
> org.eclipse.swt.SWTException: Failed to execute runnable 
> (java.lang.NoSuchMethodError: 
> org.hamcrest.core.IsAnything.any(Ljava/lang/Class;)Lorg/hamcrest/Matcher;)
> at org.eclipse.swt.SWT.error(SWT.java:4392)
> at org.eclipse.swt.SWT.error(SWT.java:4307)
This is https://bugs.eclipse.org/bugs/show_bug.cgi?id=404346

> Right now we don't know how to overcome this in automated jenkins test 
> runs - swtbot always takes the newest version of hamcrest from the 
> kepler platform, so even adding older hamcrest repo wouldn't help 
> here. Do you have any suggestion for us? :)
That's because Kepler M6 ships Junit 4.10 which depends on Hamcrest 1.3. 
SWTBot builds against Hamcrest 1.1 and Hamcrest has API breaks between 
1.1 and 1.3.
The general workaround is to make sure that you test bundle will resilve 
to Junit < 4.10 and hamcrest 1.1. This can be achieved by setting strict 
version range in your test bundle MANIFEST for org.junit and 
org.hamcrest, so Tycho will use the older ones, and test should work.

> Also, what will be the fix in SWTBot? If you fix it to work with the 
> new hamcrest, it won't work with the older version, right? So this new 
> swtbot will not be able to work with Juno with older hamcrest then?
Cf bug comments.
The fix consist in using different way to instantiate Matchers. 
Fortunately, there are still some public constructors that we can use 
directly and that are available with hamcrest 1.1 and 1.3.

I'm totally opposed to break backward-compatibility in SWTBot. Since 
you're having trouble because of this bug, I'll try to fix it soon. Any 
help is welcome.

Cheers,
-- 
Mickael Istria
Eclipse developer at JBoss, by Red Hat <http://www.jboss.org/tools>
My blog <http://mickaelistria.wordpress.com> - My Tweets 
<http://twitter.com/mickaelistria>
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