Sam Brannen f5d36aa47a Revert use of Map::computeIfAbsent in thread and tx scopes
Issues gh-25038 and gh-25618 collectively introduced a regression for
thread-scoped and transaction-scoped beans.

For example, given a thread-scoped bean X that depends on another
thread-scoped bean Y, if the names of the beans (when used as map keys)
end up in the same bucket within a ConcurrentHashMap AND an attempt is
made to retrieve bean X from the ApplicationContext prior to retrieving
bean Y, then the use of Map::computeIfAbsent in SimpleThreadScope
results in recursive access to the same internal bucket in the map.

On Java 8, that scenario simply hangs. On Java 9 and higher,
ConcurrentHashMap throws an IllegalStateException pointing out that a
"Recursive update" was attempted.

In light of these findings, we are reverting the changes made to
SimpleThreadScope and SimpleTransactionScope in commits 50a4fdac6e and
148dc95eb1.

Closes gh-25801
2020-09-25 11:00:06 +02:00
2020-03-14 10:06:25 +01:00
2020-06-23 11:35:22 +02:00
2020-09-15 10:08:01 +02:00
2020-01-28 21:56:35 +01:00
2020-09-18 18:15:36 +02:00
2017-06-12 08:07:54 +02:00
2014-10-05 18:12:50 +02:00
2019-03-21 15:08:55 -05:00
2020-04-20 12:32:11 +01:00
2020-09-15 08:31:10 +00:00
2019-08-17 19:20:36 +02:00
2019-10-18 10:38:40 +02:00
2019-03-21 15:08:55 -05:00
2019-08-20 22:01:12 +02:00
2019-11-05 15:20:18 +01:00
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2019-12-02 16:43:02 +01:00

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