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Re: [henshin-dev] henshin-dev Digest, Vol 56, Issue 3
Hi laghouaouta,

you are using dynamic EMF but the dynamically loaded package does not have a corresponding factory. This can happen when you mix static and dynamic EMF.

To avoid this problem, you should not register the package yourself in the registry, but let EMF take care of this. In your Henshin file you should import the package from your workspace, not from the static EMF registry. Similarly, your instance model needs to refer to the Ecore file directly. You can do a right-click on the Ecore file, and click on Henshin -> Create Dynamic Instance. This will create a sample file. The important piece in the header is:

xsi:schemaLocation="http://test/1.0 Test.ecore"

--> This tells EMF from where to load the Ecore model.

In your Java code you don't need to register any packages anymore. It is also worth looking at the examples plugin (some of the examples you can also find on our website). Almost all of them use dynamic EMF -- so you can compare the approaches.

Hope this helps.

Cheers,
Christian 
 

2014-12-24 11:58 GMT+01:00 laghouaouta youness <rabat.ntic@xxxxxxxxx>:

Hi Christian,

Thank you for your response. Actually, I have to match string constants and I tested with integers but this problem persists.

Yes , this occurs specifically when the rule has to evaluate attribute values. And I performed the deleting of a contained node without errors.

Please find below the resources I used to test this scenario:


//Test.ecore

<?xml version="1.0" encoding="UTF-8"?>

<ecore:EPackage xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore" name="test" nsURI="http://test/1.0" nsPrefix="test">

  <eClassifiers xsi:type="ecore:EClass" name="Rule">

    <eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>

    <eStructuralFeatures xsi:type="ecore:EReference" name="params" upperBound="-1"

        eType="#//Param" containment="true"/>

    <eStructuralFeatures xsi:type="ecore:EAttribute" name="id" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EInt"/>

  </eClassifiers>

  <eClassifiers xsi:type="ecore:EClass" name="Param"/>

</ecore:EPackage>


//unit1.henshin

<?xml version="1.0" encoding="UTF-8"?>

<henshin:Module xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:henshin="http://www.eclipse.org/emf/2011/Henshin" xmi:id="_bIT78IlJEeS-Lpe2rDONkQ">

  <imports href="" href="http://test/1.0#/" target="_blank">http://test/1.0#/"/>

  <units xsi:type="henshin:Rule" xmi:id="_cmLoIIlJEeS-Lpe2rDONkQ" name="r1">

    <lhs xmi:id="_cnX68IlJEeS-Lpe2rDONkQ" name="Lhs">

      <nodes xmi:id="_eMsS8IlJEeS-Lpe2rDONkQ">

        <type href="" href="http://test/1.0#//Rule" target="_blank">http://test/1.0#//Rule"/>

        <attributes xmi:id="_gN0dMIlJEeS-Lpe2rDONkQ" value="&quot;a&quot;">

          <type href="" href="http://test/1.0#//Rule/name" target="_blank">http://test/1.0#//Rule/name"/>

        </attributes>

      </nodes>

    </lhs>

    <rhs xmi:id="_cnX68YlJEeS-Lpe2rDONkQ" name="Rhs">

      <nodes xmi:id="_eMsS8YlJEeS-Lpe2rDONkQ">

        <type href="" href="http://test/1.0#//Rule" target="_blank">http://test/1.0#//Rule"/>

        <attributes xmi:id="_gN0dMYlJEeS-Lpe2rDONkQ" value="&quot;b&quot;">

          <type href="" href="http://test/1.0#//Rule/name" target="_blank">http://test/1.0#//Rule/name"/>

        </attributes>

      </nodes>

    </rhs>

    <mappings xmi:id="_eMsS8olJEeS-Lpe2rDONkQ" origin="_eMsS8IlJEeS-Lpe2rDONkQ" image="_eMsS8YlJEeS-Lpe2rDONkQ"/>

  </units>

</henshin:Module>



//base.xmi

<?xml version="1.0" encoding="ASCII"?>

<test:Rule xmi:version="2.0"

    xmlns:xmi="http://www.omg.org/XMI"

    xmlns:test="http://test/1.0"

    name="a">

  <params/>

  <params/>

</test:Rule>


//unit1.henshin (the running version that deletes a Param node)

<?xml version="1.0" encoding="UTF-8"?>

<henshin:Module xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:henshin="http://www.eclipse.org/emf/2011/Henshin" xmi:id="_lxujgIm-EeSNK6Vke8rPuQ">

  <imports href="" href="http://test/1.0#/" target="_blank">http://test/1.0#/"/>

  <units xsi:type="henshin:Rule" xmi:id="_rhBBkIm-EeSNK6Vke8rPuQ" name="r1">

    <lhs xmi:id="_rhBBlYm-EeSNK6Vke8rPuQ" name="Lhs">

      <nodes xmi:id="_I5rksIm_EeSNK6Vke8rPuQ" outgoing="_JPZ9E4m_EeSNK6Vke8rPuQ">

        <type href="" href="http://test/1.0#//Rule" target="_blank">http://test/1.0#//Rule"/>

      </nodes>

      <nodes xmi:id="_JPZ9EIm_EeSNK6Vke8rPuQ" incoming="_JPZ9E4m_EeSNK6Vke8rPuQ">

        <type href="" href="http://test/1.0#//Param" target="_blank">http://test/1.0#//Param"/>

      </nodes>

      <edges xmi:id="_JPZ9E4m_EeSNK6Vke8rPuQ" source="_I5rksIm_EeSNK6Vke8rPuQ" target="_JPZ9EIm_EeSNK6Vke8rPuQ">

        <type href="" href="http://test/1.0#//Rule/params" target="_blank">http://test/1.0#//Rule/params"/>

      </edges>

    </lhs>

    <rhs xmi:id="_rhBBlom-EeSNK6Vke8rPuQ" name="Rhs">

      <nodes xmi:id="_I5rksYm_EeSNK6Vke8rPuQ">

        <type href="" href="http://test/1.0#//Rule" target="_blank">http://test/1.0#//Rule"/>

      </nodes>

    </rhs>

    <mappings xmi:id="_I5rksom_EeSNK6Vke8rPuQ" origin="_I5rksIm_EeSNK6Vke8rPuQ" image="_I5rksYm_EeSNK6Vke8rPuQ"/>

  </units>

</henshin:Module>



Greetings,



Youness LAGHOUAOUTA

Phd Student 

Mohammed V-Rabat University



2014-12-24 8:32 GMT+00:00 <henshin-dev-request@xxxxxxxxxxx>:
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Today's Topics:

   1. Failed to execute henshin rules in plug-in        developement
      (laghouaouta youness)
   2. Re: Failed to execute henshin rules in plug-in    developement
      (Christian Krause)


----------------------------------------------------------------------

Message: 1
Date: Tue, 23 Dec 2014 21:30:48 +0000
From: laghouaouta youness <rabat.ntic@xxxxxxxxx>
To: henshin-dev@xxxxxxxxxxx
Subject: [henshin-dev] Failed to execute henshin rules in plug-in
        developement
Message-ID:
        <CANmOEp=Oy2X7C6SCxQLDc0+kHUkkJB=EBqvPfU4ukpmKTg1Bdg@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"

Hi

I?m working on an eclipse plug-in that employ a specific graph
transformation to weave certain patterns in a base model. I have
programmatically performed this scenario with a JAVA application, but I
couldn't do it in an eclipse plug-in project. Using the debugging mode, I
got the following exception thrown by the call of the execute() operation.


Particularly, this problem occurs when the graph transformation has to
manipulate an attribute value, and I was able to debug the program without
errors for a transformation that simply removes a graph node.


java.lang.NullPointerException

at
org.eclipse.emf.ecore.util.EcoreUtil.createFromString(EcoreUtil.java:3483)

at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl.castValueToDataType(EngineImpl.java:969)

at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl.evalAttributeExpression(EngineImpl.java:895)

at
org.eclipse.emf.henshin.interpreter.info.VariableInfo.createConstraints(VariableInfo.java:188)

at
org.eclipse.emf.henshin.interpreter.info.VariableInfo.createVariables(VariableInfo.java:111)

at
org.eclipse.emf.henshin.interpreter.info.VariableInfo.<init>(VariableInfo.java:77)

at
org.eclipse.emf.henshin.interpreter.info.RuleInfo.<init>(RuleInfo.java:26)

at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl.getRuleInfo(EngineImpl.java:703)

at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchFinder.<init>(EngineImpl.java:305)

at
org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchGenerator.iterator(EngineImpl.java:251)

at
org.eclipse.emf.henshin.interpreter.impl.RuleApplicationImpl.execute(RuleApplicationImpl.java:89)

at
org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.executeRule(UnitApplicationImpl.java:175)

at
org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.doExecute(UnitApplicationImpl.java:99)

at
org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.execute(UnitApplicationImpl.java:89)

at run.Main.execute(Main.java:55)



The code fragment we use to execute the henshin transformation is given
here:


HenshinResourceSet resourceSet = new HenshinResourceSet(ResourcePath);

Module module = resourceSet.getModule("unit1.henshin", false);

Resource r = resourceSet.getResource("Test.ecore");

EObject eObject = r.getContents().get(0);

if (eObject instanceof EPackage) {

    EPackage p = (EPackage)eObject;

    resourceSet.getPackageRegistry().put(p.getNsURI(), p);

}

EGraph graph = new EGraphImpl(resourceSet.getResource("base.xmi"));

Engine engine = new EngineImpl();

UnitApplication app = new UnitApplicationImpl(engine);

app.setEGraph(graph);

app.setUnit(module.getUnit("r1"));

app.execute(null);

Resource rs=resourceSet.getResource("base.xmi");

rs.setModified(true);

rs.getContents().clear();

for(int i=0;i<graph.getRoots().size();i++){

rs.getContents().add(graph.getRoots().get(i));

}

rs.save(null);


Greetings,
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------------------------------

Message: 2
Date: Wed, 24 Dec 2014 09:32:16 +0100
From: Christian Krause <henshin.ck@xxxxxxxxx>
To: Henshin developers mailing list <henshin-dev@xxxxxxxxxxx>
Subject: Re: [henshin-dev] Failed to execute henshin rules in plug-in
        developement
Message-ID:
        <CAHwrtvpQJFxeQoSh=RU9gVC_79-J8XyJH0+0fShazG6g6Qn+sQ@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"

Hi laghouaouta,

from the exception it looks like in your rule an attribute is matched
using a constant and that this constant cannot correctly be instantiated
from its string representation. How does your rule exactly look like
(particularly
the attribute part)?

Cheers,
Christian

2014-12-23 22:30 GMT+01:00 laghouaouta youness <rabat.ntic@xxxxxxxxx>:

> Hi
>
> I?m working on an eclipse plug-in that employ a specific graph
> transformation to weave certain patterns in a base model. I have
> programmatically performed this scenario with a JAVA application, but I
> couldn't do it in an eclipse plug-in project. Using the debugging mode, I
> got the following exception thrown by the call of the execute() operation.
>
>
> Particularly, this problem occurs when the graph transformation has to
> manipulate an attribute value, and I was able to debug the program without
> errors for a transformation that simply removes a graph node.
>
>
> java.lang.NullPointerException
>
> at
> org.eclipse.emf.ecore.util.EcoreUtil.createFromString(EcoreUtil.java:3483)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.EngineImpl.castValueToDataType(EngineImpl.java:969)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.EngineImpl.evalAttributeExpression(EngineImpl.java:895)
>
> at
> org.eclipse.emf.henshin.interpreter.info.VariableInfo.createConstraints(VariableInfo.java:188)
>
> at
> org.eclipse.emf.henshin.interpreter.info.VariableInfo.createVariables(VariableInfo.java:111)
>
> at
> org.eclipse.emf.henshin.interpreter.info.VariableInfo.<init>(VariableInfo.java:77)
>
> at
> org.eclipse.emf.henshin.interpreter.info.RuleInfo.<init>(RuleInfo.java:26)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.EngineImpl.getRuleInfo(EngineImpl.java:703)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchFinder.<init>(EngineImpl.java:305)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.EngineImpl$MatchGenerator.iterator(EngineImpl.java:251)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.RuleApplicationImpl.execute(RuleApplicationImpl.java:89)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.executeRule(UnitApplicationImpl.java:175)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.doExecute(UnitApplicationImpl.java:99)
>
> at
> org.eclipse.emf.henshin.interpreter.impl.UnitApplicationImpl.execute(UnitApplicationImpl.java:89)
>
> at run.Main.execute(Main.java:55)
>
>
>
> The code fragment we use to execute the henshin transformation is given
> here:
>
>
> HenshinResourceSet resourceSet = new HenshinResourceSet(ResourcePath);
>
> Module module = resourceSet.getModule("unit1.henshin", false);
>
> Resource r = resourceSet.getResource("Test.ecore");
>
> EObject eObject = r.getContents().get(0);
>
> if (eObject instanceof EPackage) {
>
>     EPackage p = (EPackage)eObject;
>
>     resourceSet.getPackageRegistry().put(p.getNsURI(), p);
>
> }
>
> EGraph graph = new EGraphImpl(resourceSet.getResource("base.xmi"));
>
> Engine engine = new EngineImpl();
>
> UnitApplication app = new UnitApplicationImpl(engine);
>
> app.setEGraph(graph);
>
> app.setUnit(module.getUnit("r1"));
>
> app.execute(null);
>
> Resource rs=resourceSet.getResource("base.xmi");
>
> rs.setModified(true);
>
> rs.getContents().clear();
>
> for(int i=0;i<graph.getRoots().size();i++){
>
> rs.getContents().add(graph.getRoots().get(i));
>
> }
>
> rs.save(null);
>
>
> Greetings,
>
>
>
> _______________________________________________
> henshin-dev mailing list
> henshin-dev@xxxxxxxxxxx
> To change your delivery options, retrieve your password, or unsubscribe
> from this list, visit
> https://dev.eclipse.org/mailman/listinfo/henshin-dev
>
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