On Wed, 10 Dec 2025 11:09:17 GMT, Maurizio Cimadamore <[email protected]> 
wrote:

>> David Beaumont has updated the pull request incrementally with one 
>> additional commit since the last revision:
>> 
>>   Remove note about StableValue (not possible)
>
> src/jdk.compiler/share/classes/com/sun/tools/javac/file/JRTIndex.java line 
> 139:
> 
>> 137:         /** Close underlying shared resources once no users exist 
>> (called exactly once). */
>> 138:         private synchronized void close() throws IOException {
>> 139:             assert !isClosed;
> 
> This should also use `Assert.check(isClosed)`. 
> In fact, perhaps it might be worth pulling this check out in some 
> `ensureOpen` method, and call that method whenever you need.

There's only really one other place, but (see my other comment about asserts) I 
don't think the other case should be an assertion, since callers can just try 
to use the instance after it's closed. Here, it's a bug *in this source file* 
if close() were called twice (hence okay as an assert).

-------------

PR Review Comment: 
https://git.openjdk.org/valhalla/pull/1761#discussion_r2622824109

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