Call abstract java class from jruby with a generic

Question

Currently facing an issue while writing a similar java class in Jruby.

Example:

In Java:

 public class Client extends ClientConnection<ChannelType> {

  //do some stuff

 }

In Jruby:

class Client < Java::'package_name'::ClientConnection

//do some stuff

end

Don't know how to pass ChannelType class in Jruby code while rewriting the Client class

Answer 1

The short version is, you can't unfortunately.

The JRuby wiki explains it as such here (https://github.com/jruby/jruby/wiki/CallingJavaFromJRuby#beware-of-java-generics):

If a Java class is defined with Java generics, the types are erased during compilation for backwards compatibility. As a result, JRuby will have problems with automatic type conversion. For example, if you have a Map, it will be seen as a simple Map, and JRuby will not be able to determine the correct types using reflection.