This is my first message posted here after I finally succeeded in
subscribing to Hibernate dev mail list.
As well known, we utilized the following 'lazy initialization' pattern
extensively in our codebase to save memory:
if ( activeFactoryNames == null ) {
activeFactoryNames = new ArrayList<>();
}
However, even since JDK7, ArrayList has gone through refactoring to
keep from allocating
memory for 10 elements in advance, if the instance was created by
default constructor and the allocation of memory
is only done when some element is really added in future. Namely,
ArrayList has the lazy initialization feature built-in.
E.g., see
https://stackoverflow.com/questions/33688753/jdk-api-documentation-is-incorrect-for-arraylist-constructor-is-that-a-bug
for details. You can also browse the source code of ArrayList to confirm.
[image: Screen Shot 2020-08-18 at 4.06.58 PM.png]
Needless to say, the lazy initialization pattern has serious NPE issue
if it is not coded carefully (which is tedious and error-prone per
se).
As an active Hibernate v6 contributor, I am troubled by such NPE issue
again and again.
Is it a good timing to get rid of the above lazy initialization pattern for now?
Hopefully my message is good food for thought. No finger pointing. Just curious.
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