Remote test of getting adapter for document leads to NPE

Sample remote test in placefulservice:

public void testDBAnnotation() throws Exception {
DocumentModel root = _getRootDocument();
DocumentModel file = new DocumentModelImpl(root.getPathAsString(),
"file", "File");

file = _createChildDocument(file);

DBAnnotatableDocument adoc = file.getAdapter(DBAnnotatableDocument.class);
SubscriptionConfig config = new SubscriptionConfig();
config.setId("xxx");
config.setEvent("publish");
adoc.setAnnotation("SubscriptionConfig", "val1");
}

leads to:
java.lang.NullPointerException
at org.nuxeo.ecm.core.api.impl.DocumentModelImpl.findAdapter(DocumentModelImpl.java:454)
at org.nuxeo.ecm.core.api.impl.DocumentModelImpl.getAdapter(DocumentModelImpl.java:429)
...

which happens in:
private <T> T findAdapter(Class<T> itf) {
DocumentAdapterService svc = (DocumentAdapterService) NXRuntime
.getRuntime().getComponent(DocumentAdapterService.NAME);

of DocumentModelImpl.java in org.nuxeo.ecm.core.api.impl

server.log:
2007-02-27 14:51:19,443 INFO [org.nuxeo.ecm.core.api.adapter.DocumentAdapterService] Registered document adapter factorynull: interface org.nuxeo.ecm.platform.ec.placeful.DBAnnotatableDocument

The same NPE happens in standard remote tests in TestAPI.java in
// TODO: fix and reenable.
public void testDocumentAdapter() throws Exception

{ DocumentModel root = _getRootDocument(); DocumentModel file = new DocumentModelImpl(root.getPathAsString(), "file", "File"); file = _createChildDocument(file); AnnotatedDocument adoc = file.getAdapter(AnnotatedDocument.class); assertNotNull(adoc); adoc.putAnnotation("key1", "val1"); adoc.putAnnotation("key2", "val2"); assertEquals("val1", adoc.getAnnotation("key1")); assertEquals("val2", adoc.getAnnotation("key2")); adoc = file.getAdapter(AnnotatedDocument.class); assertEquals("val1", adoc.getAnnotation("key1")); assertEquals("val2", adoc.getAnnotation("key2")); }

which is btw disabled at the moment.