The issue was discussed here: To reproduce the problem you can extend package org.compass.core.test.all.AllTests with a new test case: public void testAllWithTermVector2() { CompassSession session = openSession(); CompassTransaction tr = session.beginTransaction(); for(int i = 1; i < 5; i++){ Long id = new Long(i); A a = new A(); a.setId(id); a.setValue1("test1"); a.setValue2("test2"); session.save("a5", a); } for(int i = 1; i < 5; i++){ Long id = new Long(i); A a = new A(); a.setId(id); a.setValue1("test1"); a.setValue2("test2"); session.save("a6", a); } CompassHits hits = session.find("alias:a5"); try{ for(int i = 0; i < hits.getLength(); i++){ Resource r = hits.hit(i).getResource(); TermFreqVector termInfoVector = LuceneHelper.getTermFreqVector(session, r, CompassEnvironment.All.DEFAULT_NAME); assertNotNull(termInfoVector); } }catch(Exception e){ fail(e.getMessage()); } hits = session.find("alias:a6"); //ak13: the bad case is here: try{ for(int i = 0; i < hits.getLength(); i++){ Resource r = hits.hit(i).getResource(); TermFreqVector termInfoVector = LuceneHelper.getTermFreqVector(session, r, CompassEnvironment.All.DEFAULT_NAME); assertNotNull(termInfoVector); } } }catch(Exception e){ fail(e.getMessage()); } tr.commit(); session.close(); } The difference to the working test cases is that I use several resources in 2 different domains and get them using session.find(..), not session.loadResource(..) Because I've got this problem using RSEM but unittests are based on OSEM, I created unittest for my case also (behavior is the same as for OSEM: produces the same error when I use session.find(..) and works fine if I use session.loadResource(..).