RecordManager r = RecordManagerFactory.createRecordManager(file);
PrimaryTreeMap<Long,StoreReference<String>> t = r.treeMap("aaa");
t.put(1l, new StoreReference(r,"1"));
t.put(2l, new StoreReference(r,"2"));
r.commit();
assertEquals("1",t.get(1l).get(r));
assertEquals("2",t.get(2l).get(r));
//reopen store