How to Build Netty-Transport-Native-Epoll-4.0.32.Final-Linux-X86_64.Jar

Error in Maven in Jenkins while resolving for io.netty:netty-transport-native-epoll

I have resolved the issue as I should have added netty-all rather than netty microbench, so adding this dependency solved the issue

  <dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId> 
    <version>4.1.5.Final</version>
  </dependency> 

How to fix the Found Netty's native epoll transport in the classpath, but epoll is not available. Using NIO instead warning?

If you are running on Linux, you can use the native Linux driver. For instance, if you are using Maven, add a dependency like this:

<dependency>
  <groupId>io.netty</groupId>
  <artifactId>netty-transport-native-epoll</artifactId>
  <version>4.0.27.Final</version>
  <classifier>linux-x86_64</classifier>
</dependency>

An alternative, you can suppress the warning by setting
-Dcom.datastax.driver.FORCE_NIO=true. As it is only a performance optimization, it is a viable option to ignore it.

For more background, refer to the Netty documentation about native transports.

Error in Maven in Jenkins while resolving for io.netty:netty-transport-native-epoll

I have resolved the issue as I should have added netty-all rather than netty microbench, so adding this dependency solved the issue

  <dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId> 
    <version>4.1.5.Final</version>
  </dependency> 

How to get KQueue to be available in Java in OSX?

It was due to one of the dependencies importing netty-all. This was causing the Kqueue packages to be imported twice and with different versions.

The problem was that I did not fully read the stack trace from:

KQueue.unavailabilityCause().printStackTrace();

In the end of that stack trace, it said:

Caused by: java.lang.IllegalStateException: Multiple resources found for 'META-INF/native/libnetty_transport_native_kqueue_x86_64.jnilib' with different content:
...

After that, I was able to find where the package was coming from and fix it. Then I was able to locally run the Java Code to run domain socket and test it locally.

I used IntelliJ to run it after the fix. (VsCode had a problem even after the fix, hence wanted to mention it)

Ktor no netty_transport_native_epoll_x86_64 in java.library.path

Switching from debug level to info or warn will hide this information.

If in the log further down there is

DEBUG io.netty.util.internal.NativeLibraryLoader - Successfully loaded the library /tmp/libnetty_transport_native_epoll_x86_646903432541420558.so

you're safe and should ignore the message (further up)

DEBUG io.netty.util.internal.NativeLibraryLoader - netty_transport_native_epoll_x86_64 cannot be loaded from java.library.path

It appears as a kind of try and error approach until an valid option is found, and it is tagged as an DEBUG message, so less relevant for library users which could go to INFO or WARNING log level or try suppressing this specific message.

See also here and here

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