Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
Map<String, Object> m = reg.getExtensionToFactoryMap();
m.put("bpmn2", new Bpmn2ResourceFactoryImpl());

ResourceSet resSet = new ResourceSetImpl();

Resource resource = resSet.getResource(URI.createURI("My.bpmn2"), true);
		
DocumentRoot dr = (DocumentRoot)resource.getContents().get(0);
Process p = dr.getProcess();

			// Create a URI from a file string, workspace project string, URL, whatever...
			URI uri = URI.createFileURI("/MyEclipseProject/process_1.bpmn");
			Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
			// get the Resource Factory for this URI (it should be the Bpmn2ResourceFactory!)
			Factory f = reg.getFactory(uri);
			// create the resource object (note that this does not actually LOAD the file)
			Resource res = f.createResource(uri);
			try {
				// load it
				res.load(null);
			}
			catch (IOException e) {
				// handle "file not found" exceptions, HTTP timeouts, etc. here
				e.printStackTrace();
			}

			DocumentRoot root = (DocumentRoot) res.getContents().get(0);
			Definitions definitions = root.getDefinitions();
			for (RootElement re : definitions.getRootElements()) {
				if (re instanceof Process) {
					Process p = (Process)re;
					break;
				}
			}

reg.getExtensionToFactoryMap().put("bpmn2", new Bpmn2ResourceFactoryImpl());

// Create a URI from a file string, workspace project string, URL, whatever...
URI uri = URI.createURI("FileName.bpmn2");
		
//Register the BPMN2ResourceFactory in Factory registry
Resource.Factory.Registry reg = Resource.Factory.Registry.INSTANCE;
reg.getExtensionToFactoryMap().put("bpmn2", new Bpmn2ResourceFactoryImpl());
		
// load the resource and resolve 
ResourceSet rs = new ResourceSetImpl();
Resource res = rs.createResource(uri);
		
try {
	// load it
	res.load(null);
} catch (IOException e) {
	// handle "file not found" exceptions, HTTP timeouts, etc. here
	e.printStackTrace();
}