4.1.5: Initialize distribution customizations even before config is applied #9564
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…elidon-io#9547) * Initialize distribution customizations even before config is applied * Improve comment
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Dec 4, 2024
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Backport #9547 to Helidon 4.1.5
Description
Resolves #9546
We added a new data structure,
DistributionCustomizations, in Helidon 4.1.4 to support an enhancement in MP metrics 5.1 to allow configuration of percentiles, buckets, etc.Under normal conditions, the Helidon MP metrics CDI extension invokes this type's
initmethod with an MP config object to prepare the various customizations and all is well.A user wrote a test that used MP metrics (a timer specifically) but did not mark the test with
@HelidonTestso the initialization described above did not occur. That caused an NPE.We have also since had a report of this happening in an app, in which a CDI extension attempts to register a timer before the metrics CDI extension has prepared metrics properly. As with the test use case above, this means metrics tries to use the
instancefield before it has been set.This PR modifies the
DistributionCustomizationsclass to initialize the static (non-final)instancevariable at load-time without using config. This resolves the problem the user encountered with the test.Subsequently the metrics CDI extension overwrites that initial value with one derived from configuration.
Documentation
No impact.