Ubuntu 17.04 netty-tcnative ALPN not available for JDK SSL/TLS engine

[Ashley Bye]

I'm trying to run the vertx-grpc examples in Kotlin (running under Oracle Java, but the same issue happens with OpenJDK) on Ubuntu, but am having issues with the TLS example. I'm using `netty-tcnative` rather than the statically linked library. It runs without issue on macOS, but when I try running it on Ubuntu 17.04 I get the following exception:

    SEVERE: ALPN not available for JDK SSL/TLS engine

    io.vertx.core.VertxException: ALPN not available for JDK SSL/TLS engine

    at io.vertx.core.net.impl.SSLHelper.resolveEngineOptions(SSLHelper.java:89)

    at io.vertx.core.net.impl.SSLHelper.<init>(SSLHelper.java:150)

    at io.vertx.grpc.VertxChannelBuilder.build(VertxChannelBuilder.java:148)

    at uk.ashleybye.grpc.tls.Client.start(Client.kt:22)

    at io.vertx.core.AbstractVerticle.start(AbstractVerticle.java:111)

    at io.vertx.core.impl.DeploymentManager.lambda$doDeploy$8(DeploymentManager.java:434)

    at io.vertx.core.impl.ContextImpl.lambda$wrapTask$2(ContextImpl.java:337)

    at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)

    at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:403)

    at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:445)

    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)

    at java.lang.Thread.run(Thread.java:748)

`netty-tcnative` requires `openssl >= 1.0.2` and Apache Portable Runtime. I have:

    $ openssl version

    OpenSSL 1.0.2g  1 Mar 2016

    $ apt show libapr1

    Package: libapr1

    Version: 1.5.2-5

As far as I can ascertain, the correct library location for libapr is `/usr/lib/x86_64-linux-gnu`:

    $ dpkg -L libapr1

    /.

    /usr

    /usr/lib

    /usr/lib/x86_64-linux-gnu

    /usr/lib/x86_64-linux-gnu/libapr-1.so.0.5.2

    /usr/share

    /usr/share/doc

    /usr/share/doc/libapr1

    /usr/share/doc/libapr1/changelog.Debian.gz

    /usr/share/doc/libapr1/copyright

    /usr/share/lintian

    /usr/share/lintian/overrides

    /usr/share/lintian/overrides/libapr1

    /usr/lib/x86_64-linux-gnu/libapr-1.so.0

And I have attempted to add the library to the `LD_LIBRARY_PATH` (as mentioned here) by creating `/etc/ld.so.conf.d/libapr.conf` and adding `/usr/lib/x86_64-linux-gnu`. Running `sudo ldconfig`, and still nothing. Even adding it to the standard path does nothing.

As far as I can tell, I have followed all of the instructions but it's still not working. What's more bemusing is that it runs fine on a different OS. It's worth nothing that `netty-tcnative` requires platform specific binaries, which I detect using the google `osdetector` plugin for gradle. This has detected the linux binary. However, even if I use `netty-tcnative-boring-static` I still get the same exception. Switching up versions doesn't help either (although the 2x version didn't run on maxOS but using 1.1.33.Fork26 does). I've even installed the `libnetty-tcnative-java` and `-jni` packages from apt but still no success.

I'm at a complete loss and could really use some help getting this working. I've tried a few other places with no success and thought I'd reach out to the Vert.x community to see if anyone else has any ideas. Any suggestions?

[Julien Viet]

Hi,

it seems to be a Netty issue, could you ask on the netty google group ?

Julien

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[Jez P]

This might answer your question

http://netty.io/wiki/requirements-for-4.x.html

[ash]

Thanks Jez, is there anything specific in the link that you think I’ve missed?

 

Julien, I’ll fire a copy of this into the netty google group as suggested.

 

Regards

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