Remove Clique consensus (Phase 1: error handling)#9852
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Throw IllegalStateException when a pure Clique genesis (no terminalTotalDifficulty) is detected, with a clear message directing users to migrate to QBFT or IBFT2. Networks that started as Clique and later transitioned to PoS via terminalTotalDifficulty (e.g. Linea Mainnet) continue to work through the existing TransitionBesuControllerBuilder path. Remove Clique branches from getBlockPeriodSeconds, getPoaEpochLength, and getConsensusMechanism in BesuCommand. Update CHANGELOG. Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net> Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
This is the first phase of a full removal of the deprecated Clique consensus algorithm from Besu.
IllegalStateExceptioninBesuController.fromGenesisFile()when a Clique genesis is detected, with a clear message directing users to migrate to QBFT or IBFT2getBlockPeriodSeconds,getPoaEpochLength, andgetConsensusMechanisminBesuCommandCHANGELOG.md: moves Clique from Upcoming Breaking Changes to Breaking ChangesSubsequent phases will delete the
consensus/cliquemodule, controllers, config classes, RPC methods, tests, and all remaining references.Test plan
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