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[mwe2] unmapped paths platform:/resource/ [message #1735121]

Wed, 15 June 2016 12:22

Eclipse User

Hi,

I am running a MWE2 workflow from the command line, outside eclipse (using an ant file which lunches org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher)

I have a problem with URIs in the form of "platform:/resource/..."

For example, in my worflow, I have

...
      language = StandardLanguage {
            referencedResource = "platform:/resource/..../xyz.genmodel"
...

because the grammar of my DSL references the grammar of another one.

When running the workflow, I get this error:

...
java.io.IOException: The path '/..../xyz.genmodel' is unmapped
...

Note that "platform:/resource" has been stripped.

I know that the problem is not limited to the case of "referencedResource" but appears every other time there is some reference to URIs in the form "platform:/resource".

I am using the jars of Xtext 2.9.

In older versions, the MWE2 file was different and the StandaloneSetup used to have the attribute platformUri, which I could set. Now I can't.
I'm not sure how "platform:/resource" gets resolved or why it gets stripped in the exception message.

Thanks for any suggestion

Re: [mwe2] unmapped paths platform:/resource/ [message #1735123 is a reply to message #1735121]

Wed, 15 June 2016 12:50

Eclipse User

actually the /..../ part is the most interesting one.

where does it point to?

is the classpath correct. does it contain the /..../ thing?

Re: [mwe2] unmapped paths platform:/resource/ [message #1735129 is a reply to message #1735123]

Wed, 15 June 2016 13:36

Eclipse User

let's say that my URI is

Quote:

platform:/resource/referencedProj/model/generated/xyz.genmodel

and the actual file is in this directory:

Quote:

{root}/referencedProj/model/generated/xyz.genmodel

And root *is* in the classpath

Re: [mwe2] unmapped paths platform:/resource/ [message #1735132 is a reply to message #1735129]

Wed, 15 June 2016 13:40

Eclipse User

I don't get the root is the classpath thing. How does that look like in ant?
You may give a try debugging standalone setup .setscanclasspath

Re: [mwe2] unmapped paths platform:/resource/ [message #1735136 is a reply to message #1735132]

Wed, 15 June 2016 14:08

Eclipse User

The classpath variable in ant contains, among various other things, also the path of the folder {root}.

I have not standalone setup, it's a recent workflow file. The component is XtextGenerator and the relevant attribute is language:

Workflow {
	component = XtextGenerator {
		configuration = {
			project = StandardProjectConfig {
				baseName = "myProject"
				rootPath = rootPath // this is btw the same as my folder {root}
	                        ....
			}
		}
		language = StandardLanguage {
                      ...
			referencedResource = "platform:/resource/referencedProj/model/generated/xyz.genmodel"
		   ...
		}
	}
}

And my folders on the file system:

{root}/myProject/ ...
{root}/referencedProj/ ...

(these are actually the folders where the xtext-generated artifacts are placed, and model/generated/xyz.genmodel is one of those)

I hope it's understandable.
Thank you for your help.

Re: [mwe2] unmapped paths platform:/resource/ [message #1735137 is a reply to message #1735136]

Wed, 15 June 2016 14:13

Eclipse User

Xtext will magically call the standalone setup class.

This will have a look at class classpath and will look for jars .project files etc.

Unfortunately I don't have the time to build a hello world example reproducing your problem

Usually (maven grade) you put the result jar of the first project to the classpath of the workflow of the second project

Re: [mwe2] unmapped paths platform:/resource/ [message #1735235 is a reply to message #1735137]

Thu, 16 June 2016 09:47

Eclipse User

Could it not be a problem related to resolving 'platform:/resource' instead of the classpath?

When I run the workflow file within Eclipse, and I put a deliberately wrong relative path for the .genmodel file, I get a file not found exception, and I see that the 'platform:/resource' has been resolved with the actual, absolute path of the Eclipse workspace on my filesystem (so, it makes sense)

This does not happen when I run the workflow outside eclipse; it seems that 'platform:/resource' is not mapped to anything.

Thanks

Re: [mwe2] unmapped paths platform:/resource/ [message #1735239 is a reply to message #1735235]

Thu, 16 June 2016 10:26

Eclipse User

as i said.

xtext generator will call standalonesetup (at org.eclipse.xtext.xtext.generator.XtextGeneratorStandaloneSetup.setup()) which will build up the mapping of the stuff on the classpath to platform:/resource/xxx uris.
therefore it will have a look at the classpath elements and look for jar files and for .project files.

in eclipse with will work cause the classpath is right. so what about debugging org.eclipse.emf.mwe.utils.StandaloneSetup.doRegisterResourceMapping(File) inside eclipse

Re: [mwe2] unmapped paths platform:/resource/ [message #1735600 is a reply to message #1735239]

Tue, 21 June 2016 07:39

Eclipse User

Hi, thanks.

Sorry debugging did not help so far.

I understand that within Eclipse it works as the classpath is right. In fact, it's enough to add 'referencedProj' in properties -> java-build-path -> projects for 'myProject' and Eclipse magically sets the classpath.

How to reproduce the same in the ant file where I invoke the mwe2 runner?
Currently, I have something like this:

<path id="classpath">
    <fileset dir="<root where my xtext jars are>" includes="**/*.jar" />
    <!-- none of the following does the trick -->
    <pathelement path="${basedir}/referencedProj/"/>
    <pathelement path="${basedir}/referencedProj/model/generated"/>
    <pathelement path="referencedProj"/>
</path>

    <target name="generate-xtext-artifacts">
        <java classpathref="classpath"
              classname="org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher"
              failonerror="true">
            <sysproperty key="log4j.configuration" value="${log4j_cfg}"/>
            <arg value="......./GenerateDSL.mwe2"/>
        </java>
    </target>

Do you see any obvious mistake in my classpath? That works fine when the project is not referencing another one.

Thanks anyway.

Re: [mwe2] unmapped paths platform:/resource/ [message #1735607 is a reply to message #1735600]

Tue, 21 June 2016 08:16

Eclipse User

Can you create s small example I can simply run

Re: [mwe2] unmapped paths platform:/resource/ [message #1735614 is a reply to message #1735607]

Tue, 21 June 2016 08:44

Eclipse User

i actually found your problem.

 <java classpathref="classpath"
	              classname="org.eclipse.emf.mwe2.launch.runtime.Mwe2Launcher"
	              failonerror="true" fork="true">

you missed the

fork="true"

Re: [mwe2] unmapped paths platform:/resource/ [message #1735623 is a reply to message #1735614]

Tue, 21 June 2016 09:06

Eclipse User

Great!!!!
That worked!!!!

I would have never realized that myself, thanks a lot.

From ant documentation of the java task:

fork    	if enabled triggers the class execution in another VM (disabled by default)

I wonder why it solved my classpath problem...

Thanks again.

Re: [mwe2] unmapped paths platform:/resource/ [message #1735628 is a reply to message #1735623]

Tue, 21 June 2016 09:30

Eclipse User

i dont know what the ant java task invoken when non forked.

String property = System.getProperty("java.class.path")

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