Avoid creating default event loop group when custom is set (#3124)

c8a302a6 · Rustam · GitHub · 6ae508ad · c8a302a6
--- a/ktor-server/ktor-server-netty/jvm/src/io/ktor/server/netty/NettyApplicationEngine.kt
+++ b/ktor-server/ktor-server-netty/jvm/src/io/ktor/server/netty/NettyApplicationEngine.kt
@@ -122,13 +122,14 @@ public class NettyApplicationEngine(
     * [EventLoopGroupProxy] for processing incoming requests and doing engine's internal work
     */
    private val workerEventGroup: EventLoopGroup by lazy {
-        val defaultGroup = if (configuration.shareWorkGroup) {
+        customBootstrap.config().childGroup()?.let {
+            return@lazy it
+        }
+        if (configuration.shareWorkGroup) {
            EventLoopGroupProxy.create(configuration.workerGroupSize + configuration.callGroupSize)
        } else {
            EventLoopGroupProxy.create(configuration.workerGroupSize)
        }
-
-        customBootstrap.config().childGroup() ?: defaultGroup
    }

    private val customBootstrap: ServerBootstrap by lazy {