This statement sounds a little bit cryptic. However, I guess HLS refers to the case when you lazily initialize an instance field and don't care if several threads performs this initialization more than once.
As an example, I can point to the hashCode() method of String class:
private int hashCode;public int hashCode() { int hash = hashCode; if (hash == 0) { if (count == 0) { return 0; } final int end = count + offset; final char[] chars = value; for (int i = offset; i < end; ++i) { hash = 31*hash + chars[i]; } hashCode = hash; } return hash;}As you can see access to the hashCode field (which holds cached value of the computed String hash) is not synchronized and the field isn't declared as volatile. Any thread which calls hashCode() method will still receive the same value, though hashCode field may be written more than once by different threads.
This technique has limited usability. IMHO it's usable mostly for the cases like in the example: a cached primitive/immutable object which is computed from the others final/immutable fields, but its computation in the constructor is an overkill.