Value removed from cache still be visible to putIfAbsent in single transaction scope.

If entry removed from cache new value can't be inserted using putIfAbsent in the same transaction.

cache.put("k1", "v1");

tx.start();
cache.remove("k1");
...
assertNull(cache.putIfAbsent("k1", "v2"));
tx.commit();

now cache.putIfAbsent("k1", "v2") returns "v2";