How do i keep the JVM alive to receive connections.... e.g

fun main(args:Array<String>) = runBlocking<Unit>{
   InternalLoggerFactory.setDefaultFactory(Log4JLoggerFactory.INSTANCE)
   val server = AppServer(this)
   server.run()
}

I want to main thread to stay alive until a shutdown...

You could for example

launch

your coroutine from a

CoroutineScope

and

join()

the

Job

that

launch

returns before the JVM exits.

What is

AppServer

? You should check it out to see what facilities it provides to wait until shutdown.

@elizarov AppServer has this method...

@Throws(InterruptedException::class)
fun blockUntilShutdown(){
    this.server.awaitTermination()
}

This is the implementation of awaitTermination

@Override
public void awaitTermination() throws InterruptedException {
    synchronized (lock) {
      while (!terminated) {
        lock.wait();
      }
    }
  }

Then you don’t need coroutines (

runBlocking

) here. Just use this

awaitTermination

to block.

But for reason, when i use the awaitTermination provided by the grpcServer... i can receive request on my grpcServer but for some reasons,

launch {}

blocks are not triggered.

You should

launch { … }

in some other dispatcher, because you’ve blocked your main thread by waiting, or block some other thread to wait for termination, and then you’ll be able to launch in your main thread.

Alright, thanks @elizarov, I'm going to try this out... Thanks very much..