ALPN error when using spanner with pubsub

[minhdqvn]

Hi Knut,
I got a issue which happening when my application pulls message from pubsub (Spring boot start with Spanner-JDBC and cloud Pubsub). I assume that both Spanner and Pubsub are using gax-grpc to connect to.
`2018-12-16 12:24:39.075 INFO 7990 --- [ main] i.g.n.s.io.grpc.netty.GrpcSslContexts : netty-tcnative unavailable (this may be normal)

java.lang.UnsatisfiedLinkError: io.grpc.netty.shaded.io.netty.internal.tcnative.Library.aprMajorVersion()I
at io.grpc.netty.shaded.io.netty.internal.tcnative.Library.aprMajorVersion(Native Method) ~[grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.netty.internal.tcnative.Library.initialize(Library.java:149) ~[grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.netty.handler.ssl.OpenSsl.initializeTcNative(OpenSsl.java:445) ~[grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.netty.handler.ssl.OpenSsl.(OpenSsl.java:114) ~[grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.defaultSslProvider(GrpcSslContexts.java:244) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:171) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.forClient(GrpcSslContexts.java:120) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.NettyChannelBuilder.buildTransportFactory(NettyChannelBuilder.java:377) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:406) [grpc-core-1.16.1.jar:1.16.1]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createSingleChannel(InstantiatingGrpcChannelProvider.java:246) [gax-grpc-1.35.0.jar:1.35.0]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createChannel(InstantiatingGrpcChannelProvider.java:160) [gax-grpc-1.35.0.jar:1.35.0]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.getTransportChannel(InstantiatingGrpcChannelProvider.java:152) [gax-grpc-1.35.0.jar:1.35.0]
at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:149) [gax-1.35.0.jar:1.35.0]
at com.google.cloud.pubsub.v1.stub.GrpcSubscriberStub.create(GrpcSubscriberStub.java:260) [google-cloud-pubsub-1.55.0.jar:1.55.0]
at com.google.cloud.pubsub.v1.Subscriber.doStart(Subscriber.java:286) [google-cloud-pubsub-1.55.0.jar:1.55.0]
at com.google.api.core.AbstractApiService$InnerService.doStart(AbstractApiService.java:148) [api-common-1.7.0.jar:na]
at com.google.common.util.concurrent.AbstractService.startAsync(AbstractService.java:225) [guava-24.1.1-jre.jar:na]
at com.google.api.core.AbstractApiService.startAsync(AbstractApiService.java:120) [api-common-1.7.0.jar:na]
at com.google.cloud.pubsub.v1.Subscriber.startAsync(Subscriber.java:278) [google-cloud-pubsub-1.55.0.jar:1.55.0]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_152]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1288) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1127) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]

2018-12-16 12:24:39.076 INFO 7990 --- [ main] i.g.n.s.io.grpc.netty.GrpcSslContexts : Conscrypt not found (this may be normal)
2018-12-16 12:24:39.076 INFO 7990 --- [ main] i.g.n.s.io.grpc.netty.GrpcSslContexts : Jetty ALPN unavailable (this may be normal)

java.lang.ClassNotFoundException: org/eclipse/jetty/alpn/ALPN
at java.lang.Class.forName0(Native Method) ~[na:1.8.0_152]
at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_152]
at io.grpc.netty.shaded.io.grpc.netty.JettyTlsUtil.isJettyAlpnConfigured(JettyTlsUtil.java:64) ~[grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.findJdkProvider(GrpcSslContexts.java:266) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.defaultSslProvider(GrpcSslContexts.java:248) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.configure(GrpcSslContexts.java:171) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.GrpcSslContexts.forClient(GrpcSslContexts.java:120) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.netty.shaded.io.grpc.netty.NettyChannelBuilder.buildTransportFactory(NettyChannelBuilder.java:377) [grpc-netty-shaded-1.16.1.jar:1.16.1]
at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:406) [grpc-core-1.16.1.jar:1.16.1]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createSingleChannel(InstantiatingGrpcChannelProvider.java:246) [gax-grpc-1.35.0.jar:1.35.0]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.createChannel(InstantiatingGrpcChannelProvider.java:160) [gax-grpc-1.35.0.jar:1.35.0]
at com.google.api.gax.grpc.InstantiatingGrpcChannelProvider.getTransportChannel(InstantiatingGrpcChannelProvider.java:152) [gax-grpc-1.35.0.jar:1.35.0]
at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:149) [gax-1.35.0.jar:1.35.0]
at com.google.cloud.pubsub.v1.stub.GrpcSubscriberStub.create(GrpcSubscriberStub.java:260) [google-cloud-pubsub-1.55.0.jar:1.55.0]
at com.google.cloud.pubsub.v1.Subscriber.doStart(Subscriber.java:286) [google-cloud-pubsub-1.55.0.jar:1.55.0]
at com.google.api.core.AbstractApiService$InnerService.doStart(AbstractApiService.java:148) [api-common-1.7.0.jar:na]
at com.google.common.util.concurrent.AbstractService.startAsync(AbstractService.java:225) [guava-24.1.1-jre.jar:na]
at com.google.api.core.AbstractApiService.startAsync(AbstractApiService.java:120) [api-common-1.7.0.jar:na]
at com.google.cloud.pubsub.v1.Subscriber.startAsync(Subscriber.java:278) [google-cloud-pubsub-1.55.0.jar:1.55.0]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_152]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:456) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1288) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1127) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:538) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) [spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846) ~[spring-beans-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.1.1.RELEASE.jar:2.1.1.RELEASE]
`