From a58aa9925ba99ee48d501cb1e616ec9b8b2a28eb Mon Sep 17 00:00:00 2001
From: Max Lambrecht <maxlambrecht@gmail.com>
Date: Mon, 18 May 2020 12:51:02 -0300
Subject: [PATCH] Avoid warning Unknown channel option 'SO_KEEPALIVE'

Signed-off-by: Max Lambrecht <maxlambrecht@gmail.com>
---
 .../spiffe/workloadapi/internal/GrpcManagedChannelFactory.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/java-spiffe-core/src/main/java/spiffe/workloadapi/internal/GrpcManagedChannelFactory.java b/java-spiffe-core/src/main/java/spiffe/workloadapi/internal/GrpcManagedChannelFactory.java
index 4c291b2..178d060 100644
--- a/java-spiffe-core/src/main/java/spiffe/workloadapi/internal/GrpcManagedChannelFactory.java
+++ b/java-spiffe-core/src/main/java/spiffe/workloadapi/internal/GrpcManagedChannelFactory.java
@@ -3,6 +3,7 @@ package spiffe.workloadapi.internal;
 import io.grpc.ManagedChannel;
 import io.grpc.netty.NegotiationType;
 import io.grpc.netty.NettyChannelBuilder;
+import io.netty.channel.ChannelOption;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.epoll.EpollDomainSocketChannel;
 import io.netty.channel.epoll.EpollEventLoopGroup;
@@ -58,6 +59,8 @@ public class GrpcManagedChannelFactory {
             // nThreads = 0 -> use Netty default
             EpollEventLoopGroup epollEventLoopGroup = new EpollEventLoopGroup(0, executorService);
             channelBuilder.eventLoopGroup(epollEventLoopGroup)
+                    // avoid warning Unknown channel option 'SO_KEEPALIVE'
+                    .withOption(ChannelOption.SO_KEEPALIVE, null)
                     .channelType(EpollDomainSocketChannel.class);
             return epollEventLoopGroup;
         }