refactor(minor): Replace direct imports with reflection for native tr… #90
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…ansport classes in SocketIOServer Signed-off-by: NeatGuyCoding <15627489+NeatGuyCoding@users.noreply.github.com>
WalkthroughThis PR refactors Netty transport backend detection in SocketIOServer to use runtime reflection-based feature detection instead of direct availability checks. It introduces helper methods for dynamic class resolution and factory acquisition, with graceful NIO fallback when optional backends (IO_URING, EPOLL, KQUEUE) are unavailable. Changes
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Pull request overview
This PR fixes a NoClassDefFoundError that occurs when native transport dependencies (Epoll, KQueue, IoUring) are missing from the classpath by replacing direct imports with reflection-based class loading and availability checks.
Key Changes:
- Replaced direct class imports with reflection-based helper methods to check class availability and instantiate transport classes dynamically
- Fixed incorrect default handler from
IoUringIoHandlertoNioIoHandlerin theinitGroups()method - Added graceful fallback to NIO transport when native transports are unavailable
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netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java
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netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java
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netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java
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netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java
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Actionable comments posted: 1
♻️ Duplicate comments (1)
netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java (1)
377-411: Apply the same warning message clarification as in startAsync.Similar to the IO_URING/EPOLL/KQUEUE cases in
startAsync, these blocks have duplicate warning messages with identical text. Apply the same differentiation suggested in the earlier comment for lines 246-256.
🧹 Nitpick comments (2)
netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java (2)
74-108: Consider caching the Class<?> to avoid redundant lookups.Each availability check loads the same class twice - once in
isClassAvailableand again inClass.forName. While this works correctly, you could refactor to load the class once and reuse it.Example refactor for
isIoUringAvailable():private static boolean isIoUringAvailable() { - if (!isClassAvailable("io.netty.channel.uring.IoUring")) { - return false; - } try { Class<?> clazz = Class.forName("io.netty.channel.uring.IoUring"); return (Boolean) clazz.getMethod("isAvailable").invoke(null); } catch (Exception e) { return false; } }Apply the same pattern to
isEpollAvailable()andisKQueueAvailable().
282-309: Consider removing intermediate "NIO selected" logs in AUTO cascade.Lines 288, 296, and 304 log "AUTO selected NIO transport" even when the check cascade continues to the next transport. This could confuse log analysis. Consider logging only the final selection or using a different message for intermediate failures.
Example approach - only log the final decision:
+ String selectedTransport = "NIO"; if (isIoUringAvailable()) { Class<? extends ServerChannel> clazz = getIoUringServerSocketChannelClass(); if (clazz != null) { channelClass = clazz; - log.info("AUTO selected IO_URING transport"); + selectedTransport = "IO_URING"; } else { - log.info("AUTO selected NIO transport"); + // continue cascade } } else if (isEpollAvailable()) { Class<? extends ServerChannel> clazz = getEpollServerSocketChannelClass(); if (clazz != null) { channelClass = clazz; - log.info("AUTO selected EPOLL transport"); + selectedTransport = "EPOLL"; } else { - log.info("AUTO selected NIO transport"); + // continue cascade } } else if (isKQueueAvailable()) { Class<? extends ServerChannel> clazz = getKQueueServerSocketChannelClass(); if (clazz != null) { channelClass = clazz; - log.info("AUTO selected KQUEUE transport"); + selectedTransport = "KQUEUE"; } else { - log.info("AUTO selected NIO transport"); + // already NIO } - } else { - log.info("AUTO selected NIO transport"); } + log.info("AUTO selected {} transport", selectedTransport);
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🔇 Additional comments (5)
netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java (5)
65-72: LGTM - Helper method works for availability checks.The approach is appropriate for detecting optional dependencies. Note that other class-loading errors (e.g.,
LinkageError,NoClassDefFoundError) will propagate, but in this context that's acceptable since those indicate more serious configuration issues.
110-135: LGTM - Dynamic channel class resolution is correct.The reflection-based approach with null fallback aligns with the PR's goal of avoiding hard dependencies on native transports.
137-162: LGTM - IoHandler factory resolution handles missing dependencies gracefully.The methods correctly return null when classes are unavailable, allowing callers to fall back to NIO.
413-437: LGTM - AUTO cascade is cleaner than in startAsync.This implementation avoids the intermediate logging issue present in
startAsync's AUTO case by logging only once at the end. The approach is correct and maintainable.
439-442: LGTM - Default case correctly uses NioIoHandler.This change addresses the issue mentioned in the PR objectives where IoUringIoHandler was incorrectly used in the default case.
netty-socketio-core/src/main/java/com/socketio4j/socketio/SocketIOServer.java
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Qodana for JVM61 new problems were found
☁️ View the detailed Qodana report Detected 123 dependenciesThird-party software listThis page lists the third-party software dependencies used in project
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Description
Fixed an issue where
SocketIOServerdirectly imported IoUring, Epoll, and KQueue classes, which would causeNoClassDefFoundErrorwhen these native transport dependencies are not present in the classpath. The fix uses reflection to dynamically check class availability and gracefully falls back to NIO transport when these classes are unavailable.Type of Change
Related Issue
Closes #(issue number)
Changes Made
IoUring,Epoll,KQueueand their related classesstartAsync()andinitGroups()methods to use reflection instead of direct class referencesIoUringIoHandlerin default case, changed to useNioIoHandlerTesting
mvn testChecklist
Additional Notes
This fix ensures that
SocketIOServercan start normally and automatically fall back to NIO transport even whennetty-transport-native-epoll,netty-transport-native-kqueue, ornetty-transport-native-io_uringdependencies are missing from the classpath. The code has been verified to compile successfully.Summary by CodeRabbit
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