final int NB_B = 10;
final String IDX_PREFIX = "index2B";
final String F1_PREFIX = "toto";
pm = pmf.getPersistenceManager();
for(int i=0; i<NB_B; i++) {
a.add(IDX_PREFIX + i, new B(i, F1_PREFIX + i));
}
pm.close();
//Clear the cache
a = null; //permit the GC to garbage instances