Strange exception after setting some property in VE

Hello all,

I have bean class that has setSpin(int s) method. This property can be set via properties View.
The aim is to provide another way th set this property - via popup menu.
I contribute action delegate to show menu item in Beans Tree popup for some bean.
This action sets "spin" property like this:

...
public void run(IAction action) {
...
                        JavaObjectInstance m = (JavaObjectInstance) tep.getModel();
                        EditDomain ed = EditDomain.getEditDomain(tep);

                        Integer intValue = new Integer(value);
                        String initString = String.valueOf(value);

                        IJavaInstance valueToSet = BeanUtilities.createJavaObject("int",
                                        JavaEditDomainHelper.getResourceSet(ed), initString);
                       
                        EStructuralFeature spinFeature = m.eClass().getEStructuralFeature(SPIN_FEATURE);
                        m.eSet(spinFeature,valueToSet);
...
}
...

Everything looks fine. After invoking code above (from popup menu) spin property gets changed and I can see that in properties view.
But if I save change and close visual class editor (just after I invoked menu item) and open it againg I see exception in error log:

java.lang.ArrayIndexOutOfBoundsException: -1
at org.eclipse.emf.common.util.BasicEList.get(BasicEList.java:514)
at org.eclipse.emf.ecore.resource.impl.ResourceImpl.getEObjectForURIFragmentRootSegment(ResourceImpl.java:642)
at org.eclipse.emf.ecore.resource.impl.ResourceImpl.getEObject(ResourceImpl.java:692)
at org.eclipse.emf.ecore.resource.impl.ResourceImpl.getEObject(ResourceImpl.java:671)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.setValueFromId(XMLHandler.java:2550)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.setAttribValue(XMLHandler.java:2478)
at org.eclipse.emf.ecore.xmi.impl.SAXXMIHandler.handleObjectAttribs(SAXXMIHandler.java:74)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.createObjectFromFactory(XMLHandler.java:1948)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.createObjectFromTypeName(XMLHandler.java:1852)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.createObject(XMLHandler.java:1787)
at org.eclipse.emf.ecore.xmi.impl.XMIHandler.createObject(XMIHandler.java:133)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.handleFeature(XMLHandler.java:1595)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.processElement(XMLHandler.java:887)
at org.eclipse.emf.ecore.xmi.impl.XMIHandler.processElement(XMIHandler.java:84)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:866)
at org.eclipse.emf.ecore.xmi.impl.XMLHandler.startElement(XMLHandler.java:627)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at org.eclipse.emf.ecore.xmi.impl.XMLLoadImpl.load(XMLLoadImpl.java:183)
at org.eclipse.emf.ecore.xmi.impl.XMLResourceImpl.doLoad(XMLResourceImpl.java:179)
at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:1094)
at org.eclipse.emf.ecore.resource.impl.ResourceImpl.load(ResourceImpl.java:900)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoad(ResourceSetImpl.java:249)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.demandLoad(ProjectResourceSetImpl.java:83)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.demandLoadHelper(ResourceSetImpl.java:264)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getResource(ResourceSetImpl.java:390)
at org.eclipse.jem.internal.util.emf.workbench.ProjectResourceSetImpl.getResource(ProjectResourceSetImpl.java:262)
at org.eclipse.ve.internal.java.codegen.util.VEModelCacheUtility.doLoadFromCache(VEModelCacheUtility.java:103)
at org.eclipse.ve.internal.java.codegen.core.VEModelInstance.createComposition(VEModelInstance.java:100)
at org.eclipse.ve.internal.java.codegen.core.JavaSourceTranslator.reConnect(JavaSourceTranslator.java:1134)
at org.eclipse.ve.internal.java.codegen.core.JavaSourceTranslator.decodeDocument(JavaSourceTranslator.java:910)
at org.eclipse.ve.internal.java.codegen.core.JavaSourceTranslator.loadModel(JavaSourceTranslator.java:597)
at org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart$Setup.run(JavaVisualEditorPart.java:1978)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)


What I'm doing wrong? Do I set property propely?

Thank you in advance,
ID