Running gRPC with Tomcat is problematic

[joaoandremartins]

I ran into this issue trying to use the Google Cloud PubSub API from a Spring Boot app, using Tomcat by default. The issue is explained here.

Jetty ALPN/NPN has not been properly configured

A workaround is basically to use Jetty instead of Tomcat. However, ideally this should work with Tomcat too.

After reading around a bit, I tried pulling in the netty-tcnative-boringssl-static dependency, and org.eclipse.jetty.npn.npn-api since the code appears to be checking for a org.eclipse.jetty.npn.NextProtoNego class in the classpath, to no avail.

What can be done to make this work with Tomcat as well?

What version of gRPC are you using?

grpc-netty 1.2.0

What JVM are you using (java -version)?

1.8.0_121

[ejona86]

Tomcat compatibility problems were expected to be resolved with netty-tcnative 2.0. We had trouble upgrading to the last couple of Netty releases, but it seems 4.1.11 may work out. Upgrading to 4.1.11 would allow using netty-tcnative 2.0 and thus hopefully resolve the problem you're experiencing. This is being done in #2973. This seems a duplicate of #2936 at this point, so closing. But if for some reason it's not, feel free to comment more and we can reopen.

[meltsufin]

@joaoandremartins It looks like #2973 has been merged. Can you try again?

[joaoandremartins]

Running google-cloud-pubsub version 0.17.2-alpha, still seeing the same issue.

[lukaszx0]

New gRPC version which will include the fix was not released yet, and when it will be the google-cloud-pubsub will have to upgrade to it to see any changes.