<i18n dev> RFR: 8366178: Implement JEP 526: Lazy Constants (Second Preview) [v7]

[Maurizio Cimadamore]

On Mon, 13 Oct 2025 14:23:40 GMT, Per Minborg <pminborg at openjdk.org> wrote:

>> src/java.base/share/classes/java/lang/LazyConstant.java line 192:
>> 
>>> 190:  *          The {@code LazyConstant} type is not {@link Serializable}.
>>> 191:  *          <p>
>>> 192:  *          It is not recommended putting lazy constants into equality-based collections
>> 
>> Not sure what you mean here. It seems like the javadoc for `equals` says that it triggers initialization, so it should be ok?
>
> Formally, it is ok, but may result in strange side effects if we, for example, put a key of type LazyConstant in a map. It will then be initialized immediately (upon `map.put()`), and the put operation can therefore have non-obvious side effects.

I think it would be better to link to `equals` more explicitly -- e.g. "As equals and hashCode might trigger the initialization of a lazy constant, it is recommended to avoid storing lazy constants into equality-based collections (or similar constructs) as their addition (e.g. via `Map::put`, or `Set::add`) might result in subtle side-effects).

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PR Review Comment: https://git.openjdk.org/jdk/pull/27605#discussion_r2426535831