Jetty ALPN/NPN failure

[dsyer]

I can't build from master (even before 4c02b13) because of a failure in the Pub/Sub Module

Caused by: java.lang.ClassNotFoundException: org/eclipse/jetty/alpn/ALPN
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at io.grpc.netty.JettyTlsUtil.isJettyAlpnConfigured(JettyTlsUtil.java:34)
	at io.grpc.netty.GrpcSslContexts.selectApplicationProtocolConfig(GrpcSslContexts.java:153)

[joaoandremartins]

I'm not being able to reproduce this.
Does it fail when you're doing mvn clean install from the project root?
Or when you're building an app that uses our modules?

[dsyer]

Just building from root. Maybe a platform thing? Did you try with Linux.

[joaoandremartins]

I'm using Linux too. I even tried deleting my .m2 folder, but still got the same result.
Travis is passing, I'm wondering if this is anything with your local setup?

[dsyer]

This issue suggests a classpath problem: googleapis/google-cloud-java#2740, but it looks fine to me (the versions are a supported combination of the projects listed). I suspect you have something in your environment that makes it work. E.g. look at this line in GrpcSslContexts

  private static SslProvider defaultSslProvider() {
    return OpenSsl.isAvailable() ? SslProvider.OPENSSL : SslProvider.JDK;
  }

So if you have OpenSSL available in some way that I don't, then the code path is different. Also I see this in test logs:

09:17:37.158 [main] DEBUG io.netty.handler.ssl.OpenSsl - netty-tcnative not in the classpath; OpenSslEngine will be unavailable.

[dsyer]

It was a bad jar file. I cleared the local cache and that fixed it, I think.

[renannprado]

I got the same error while running inside of alpine so had to:

1 - include below two libraries
2 - I had to install the lib6-compat in alpine

compile group: 'io.netty', name: 'netty-tcnative-boringssl-static', version: '2.0.8.Final'
compile 'org.conscrypt:conscrypt-openjdk-uber:1.1.4'

RUN apk add --no-cache libc6-compat

also use this as a reference of which libraries to use:
https://github.com/grpc/grpc-java/blob/master/SECURITY.md#netty

idea from here:
docker-library/logstash#76 (comment)