Github user sebbASF commented on the issue:
https://github.com/apache/commons-lang/pull/231
If the code is not going to allow updates, then there is no need to use
ConcurrentHashMap.
If updates are allowed at run-time, there is the possibility that different
results will be obtained at different times.
Alternatively, it's potentially possible to allow updates before first use
of the data, but disallow them later.
This is the approach taken in Commons Validator
http://commons.apache.org/proper/commons-validator/xref/org/apache/commons/validator/routines/DomainValidator.html
This uses a flag to allow initial updates.
Users have to get an instance before using the class; this resets the flag
to stop further changes.
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