Netty IO Channel No Such Method Error
Briefly

Multiple versions of 'io.netty.channel' can lead to java.lang.NoSuchMethodError. Resolving this involves adding exclusions in dependencies to prevent conflict, as in the case of AWS SDK.
Adding the exclusion for 'netty-nio-client' in the AWS SDK dependency can resolve NoSuchMethodError when adding AWS SDK to an old Scala service.
Read at Medium
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