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Standalone project error: couldn't find resource on classpath [message #1061683]

Mon, 03 June 2013 09:29

Eclipse User

I created a project with the default Xtext language,

Model:
	greetings+=Greeting*;
	
Greeting:
	'Hello' name=ID '!';

and, after running the MWE2 Workflow, copied all java files into my standalone project, preserving the original directory hierarchy, and tried to execute the following Main:

import static org.junit.Assert.assertEquals;

import org.antlr.runtime.RecognitionException;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.xtext.resource.XtextResource;
import org.eclipse.xtext.resource.XtextResourceSet;

import com.google.inject.Injector;

import org.xtext.example.SimpleDSLStandaloneSetup;

public class Main {

	public static void main(String[] args) {

	    Injector injector = new SimpleDSLStandaloneSetup().createInjectorAndDoEMFRegistration();
	    XtextResourceSet resourceSet = injector.getInstance(XtextResourceSet.class);
	    resourceSet.addLoadOption(XtextResource.OPTION_RESOLVE_ALL, Boolean.TRUE);

	    Resource resource = resourceSet.getResource(URI.createFileURI("src/test.sdsl"), true);
    }
}

I get an error which states that

Exception in thread "main" com.google.inject.ProvisionException: Guice provision errors:

1) Error injecting constructor, org.eclipse.emf.common.util.WrappedException: org.eclipse.xtext.resource.ClasspathUriResolutionException: java.lang.IllegalStateException: Couldn't find resource on classpath. URI was 'classpath:/org/xtext/example/SimpleDSL.xmi'

(...)

I am trying to execute with the following command:

java -cp "classes:lib/*:src" Main

And my project hierarchy contains all java files in src/, all jars in lib/ and all .class files in classes/.

What am I missing?

[Updated on: Mon, 03 June 2013 09:40] by Moderator

Re: Standalone project error: couldn't find resource on classpath [message #1061743 is a reply to message #1061683]

Mon, 03 June 2013 13:30

Eclipse User

I probably figured it out: two files were missing from my project. The first one, <dsl_name>.xmi, originally located on

src-gen
   |-> <base_package>
            |-> <dsl_name>.xmi

(in my case, src-gen/org.xtext.example/DefaultDSL.xmi) and, the second, Internal<dsl_name>.tokens, located on

src-gen
    |-> <base_package>.parser.antlr.internal
                              |-> Internal<dsl_name>.tokens

(in my case, src-gen/org.xtext.example.parser.antlr.internal/InternalDefaultDSL.tokens)

The aforementioned Main.java file started executing as soon as the missing files were added to the project. I hope this helps anyone with a similar issue!

[Updated on: Mon, 03 June 2013 13:34] by Moderator

Re: Standalone project error: couldn't find resource on classpath [message #1061752 is a reply to message #1061743]

Mon, 03 June 2013 14:39

Eclipse User

Hi,

why dont you use the Export -> Java -> Runnable Jar FIle Wizard?

Re: Standalone project error: couldn't find resource on classpath [message #1063150 is a reply to message #1061752]

Wed, 12 June 2013 09:42

Eclipse User

Hi Christian,

Sorry for taking so long to reply to this thread. I didn't export as a .jar because I needed to manipulate individual java files outside eclipse.

I am porting the project to a simple webapp that requests a model file from the user, processes the model in memory and performs a file generation (if the model was correctly parsed).

Maybe I could do all this by exporting the original Xtext project as a .jar, but felt more comfortable with the other alternative.

Re: Standalone project error: couldn't find resource on classpath [message #1063154 is a reply to message #1063150]

Wed, 12 June 2013 09:48

Eclipse User

Hi,

if so you have to care about the classpath yourself.

Re: Standalone project error: couldn't find resource on classpath [message #1063221 is a reply to message #1063154]

Wed, 12 June 2013 13:17

Eclipse User

Indeed, but performing