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UI required when launching mwe2 headlessly? [message #1404393]

Thu, 31 July 2014 18:43

Eclipse User

I'm trying to set up a headless configuration where I launch an mwe2 workflow. I'm not able to do so without involving a large number of UI plug-ins in my setup. The bundle marks them as optional but I get the exception below when I launch.

I know I can make it work by adding the UI bundles but I would like to avoid that. Is there some configuration option that can be set to avoid it?

java.lang.NoClassDefFoundError: org/eclipse/debug/ui/RefreshTab
	at org.eclipse.emf.mwe2.launch.shortcut.Mwe2LaunchDelegate$1$1.run(Mwe2LaunchDelegate.java:38)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.ClassNotFoundException: org.eclipse.debug.ui.RefreshTab cannot be found by org.eclipse.emf.mwe2.launch_2.6.0.v201405200939
	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:423)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:336)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:328)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)

Re: UI required when launching mwe2 headlessly? [message #1404410 is a reply to message #1404393]

Fri, 01 August 2014 03:48

Eclipse User

> Is there some configuration option that can be set to avoid it?
No. Sad

We also have a job that currently runs mwe2 files with Buckminster headless.
As I started to create this launcher feature I've tried to minimize ui dependencies as far as possible.
Maybe I overlooked something... I will review this again.

Re: UI required when launching mwe2 headlessly? [message #1404421 is a reply to message #1404410]

Fri, 01 August 2014 05:24

Eclipse User

After checking the code I found this:

try {
	org.eclipse.debug.ui.RefreshTab.refreshResources(configuration, monitor);
} catch (CoreException e) {
	logger.error(e.getMessage(), e);
	return Status.OK_STATUS;
} catch (Throwable t){
	// In eclipse headless mode there are normally any ui bundles,
	// just ignore auto refresh
	logger.error(t.getMessage(), t);
	return Status.OK_STATUS;
}

I will remove the error log statement. Maybe we should create launch.ui bundle, it would be better.

Re: UI required when launching mwe2 headlessly? [message #1404422 is a reply to message #1404421]

Fri, 01 August 2014 05:36

Eclipse User

We decided to set the lower bound for eclipse runtime from 3.5 to 3.6. In helios, we can use RefreshUtil to refresh the WS after mwe2 run. So the code I've pasted before will become obsolete. Optional dependency to debug.ui will remain for a while.

Re: UI required when launching mwe2 headlessly? [message #1404445 is a reply to message #1404410]

Fri, 01 August 2014 09:09

Eclipse User

On 01/08/2014 09:48, Dennis Huebner wrote:
>> Is there some configuration option that can be set to avoid it?
> No. :(
>
> We also have a job that currently runs mwe2 files with Buckminster
> headless. As I started to create this launcher feature I've tried to
> minimize ui dependencies as far as possible.
> Maybe I overlooked something... I will review this again.

Hi

I've been using the mwe2 launcher feature
(org.eclipse.emf.mwe2.launcher.feature.group) for some time now in many
Buckminster builds and I've never experienced NoClassDefFoundErrors. At
least with version 2.5.1.

I was installing org.eclipse.emf.mwe2.launcher.feature.group in
Buckminster headless; Thomas, which feature are you installing?

cheers
Lorenzo

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
HOME: http://www.lorenzobettini.it
Xtext Book:
http://www.packtpub.com/implementing-domain-specific-languages-with-xtext-and-xtend/book

Re: UI required when launching mwe2 headlessly? [message #1404475 is a reply to message #1404393]

Fri, 01 August 2014 11:18

Eclipse User

Pushed changes to master. You can try 2.7 nightly tomorrow morning.

Re: UI required when launching mwe2 headlessly? [message #1404594 is a reply to message #1404445]

Mon, 04 August 2014 07:18

Eclipse User

Hi Lorenzo,

I'm using a brand new 'launch' actor that I just added to Buckminster so that I can express proper dependencies and prerequisites on the launch. It works just like the 'launch' command but can be specified in a cspec/cspex rather than in a command file.

I'm installing the bundle 'org.eclipse.emf.mwe2.launch' into my headless Buckminster. I've noticed that the error can be avoided by removing the following line from the launch configuration:

<stringAttribute key="org.eclipse.debug.core.ATTR_REFRESH_SCOPE" value="${workspace}"/>

I don't really need that line since Buckminster does the refresh anyway so this is no longer a problem for me.

In general though, I think a design where UI and non-UI responsibilities are divided into separate bundles is worth enforcing at all times. Weird things happen when UI bundles are present in a headless build (workbench not started yet exceptions for instance) not to mention that downloading the full IDE when it's not needed for anything is less than ideal.

Re: UI required when launching mwe2 headlessly? [message #1404596 is a reply to message #1404475]

Mon, 04 August 2014 07:29

Eclipse User

Thanks!

Re: UI required when launching mwe2 headlessly? [message #1404718 is a reply to message #1404594]

Tue, 05 August 2014 05:18

Eclipse User

On 04/08/2014 13:18, Thomas Hallgren wrote:
> Hi Lorenzo,
>
> I'm using a brand new 'launch' actor that I just added to Buckminster so
> that I can express proper dependencies and prerequisites on the launch.
> It works just like the 'launch' command but can be specified in a
> cspec/cspex rather than in a command file.
>

Hi Thomas

is this related to the 'postbind' action I see in the git repository?
So that it is possible, for instance, to automatically run the mwe2
workflows after a project is imported in the workspace?

cheers
Lorenzo

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
HOME: http://www.lorenzobettini.it
Xtext Book:
http://www.packtpub.com/implementing-domain-specific-languages-with-xtext-and-xtend/book

Re: UI required when launching mwe2 headlessly? [message #1404719 is a reply to message #1404718]

Tue, 05 August 2014 05:21

Eclipse User

Quote:

is this related to the 'postbind' action I see in the git repository?
So that it is possible, for instance, to automatically run the mwe2
workflows after a project is imported in the workspace?

That's the idea, yes.

Re: UI required when launching mwe2 headlessly? [message #1404780 is a reply to message #1404719]

Tue, 05 August 2014 13:09

Eclipse User

On 05/08/2014 11:21, Thomas Hallgren wrote:
> Quote:
>> is this related to the 'postbind' action I see in the git repository?
>> So that it is possible, for instance, to automatically run the mwe2
>> workflows after a project is imported in the workspace?
>
> That's the idea, yes.

Uh! That's cool! :)
I'll have a look at what you do in geppetto then :)

cheers
Lorenzo

--
Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
HOME: http://www.lorenzobettini.it
Xtext Book:
http://www.packtpub.com/implementing-domain-specific-languages-with-xtext-and-xtend/book

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