grpc-java: Jetty ALPN/NPN has not been properly configured

[Jorg Heymans]

Hi,

I have been troubleshooting the ALPN error i was getting under a vanilla spring-boot configuration, using netty-tcnative-boringssl-static:1.1.33.Fork24 and a plain serverbuilder with useTransportSecurity. 

It turns out that it was caused by the spring-boot-starter-web dependency, which brings its own version of tomcat-embed-core containing the jni classes that are also packaged in the tcnative jar. 

See also https://github.com/netty/netty-tcnative/issues/214 

Jorg

[Carl Mastrangelo]

FYI There was also a change in netty proper that made it interoperate better.  I don't have link handy, unfortunately.

[Jorg Heymans]

Indeed the issue I linked was closed because it was already fixed on master. Next netty version should have this fix.

Thanks
Jorg

[qian...@kikatech.com]

This is my way:

1. Edit catalina.sh

`/usr/local/Cellar/tomcat/8.5.3/libexec/bin/catalina.sh`

2. At line 103, add the following

`CATALINA_OPTS="-javaagent:/Library/Tomcat/lib/jetty-alpn-agent-2.0.6.jar"`

3. Restart tomcat

`../bin/shutdown.sh

../bin/startup.sh`