zuul-core/src/main/java/com/netflix/zuul/netty/server/Server.java [191:197]:
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        this.registry = Objects.requireNonNull(registry);
        this.addressesToInitializers = Collections.unmodifiableMap(new LinkedHashMap<>(addressesToInitializers));
        this.serverStatusManager = Preconditions.checkNotNull(serverStatusManager, "serverStatusManager");
        this.clientConnectionsShutdown =
                Preconditions.checkNotNull(clientConnectionsShutdown, "clientConnectionsShutdown");
        this.eventLoopConfig = Preconditions.checkNotNull(eventLoopConfig, "eventLoopConfig");
        this.eventLoopGroupMetrics = Preconditions.checkNotNull(eventLoopGroupMetrics, "eventLoopGroupMetrics");
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zuul-core/src/main/java/com/netflix/zuul/netty/server/Server.java [209:215]:
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        this.registry = Objects.requireNonNull(registry);
        this.addressesToInitializers = Collections.unmodifiableMap(new LinkedHashMap<>(addressesToInitializers));
        this.serverStatusManager = Preconditions.checkNotNull(serverStatusManager, "serverStatusManager");
        this.clientConnectionsShutdown =
                Preconditions.checkNotNull(clientConnectionsShutdown, "clientConnectionsShutdown");
        this.eventLoopConfig = Preconditions.checkNotNull(eventLoopConfig, "eventLoopConfig");
        this.eventLoopGroupMetrics = Preconditions.checkNotNull(eventLoopGroupMetrics, "eventLoopGroupMetrics");
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