[Backport axon-5.3.x] [#4802] Adopt a concurrently created config token instead of failing to start - #4907
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…to start The config token row is created on first use, so instances starting together against a fresh token table all raced to insert it. Only one could win, and the losers rethrew the primary-key violation as UnableToRetrieveIdentifierException without ever re-reading the row the winner had just committed, leaving all but one unable to start. Measured at three failures in four. The insert is now wrapped in a JDBC savepoint. On failure it rolls back to the savepoint, re-reads the config token and adopts the winner's identifier, rethrowing with the original cause only when there is genuinely no row to adopt. The savepoint is what makes the re-read legal on databases that abort the whole transaction on a constraint violation, and it is skipped when the connection auto-commits, since a failed insert cannot then poison anything else. Fixes #4802 (cherry picked from commit d973b86)
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Description
Backport of #4813 to
axon-5.3.x.