ctxt.commitChanges();
// *** TESTING THIS ***
ArtistExhibit ae1 = (ArtistExhibit) ctxt.newObject("ArtistExhibit");
e1.addToArtistExhibitArray(ae1);
a1.addToArtistExhibitArray(ae1);
// check before save
assertSame(e1, ae1.getToExhibit());
assertSame(a1, ae1.getToArtist());