Migrate to Netty 4.2 EventLoopGroup and allocator APIs#104
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jaredstehler merged 1 commit intomasterfrom Mar 25, 2026
Merged
Migrate to Netty 4.2 EventLoopGroup and allocator APIs#104jaredstehler merged 1 commit intomasterfrom
jaredstehler merged 1 commit intomasterfrom
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NioEventLoopGroup is deprecated in Netty 4.2 in favor of the new IoHandler-based API. Additionally, the default allocator changed from PooledByteBufAllocator to AdaptiveByteBufAllocator in 4.2, which auto-tunes for observed workloads and works better with virtual threads. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Why
Netty 4.2 deprecates
NioEventLoopGroupin favor of the newIoHandler-based API (MultiThreadIoEventLoopGroup+NioIoHandler). It also changes the default allocator fromPooledByteBufAllocatortoAdaptiveByteBufAllocator, which auto-tunes memory usage for the observed workload and integrates better with virtual threads.Changes
NioEventLoopGroupwithMultiThreadIoEventLoopGroup(NioIoHandler.newFactory())inAbstractSmtpSessionFactoryConfigandIntegrationTestPooledByteBufAllocator.DEFAULTwithAdaptiveByteBufAllocator.DEFAULTas the default allocator inAbstractSmtpSessionFactoryConfigandIntegrationTestAll 132 tests pass locally (2 pre-existing
@Ignoreskips unchanged).