Getting always a RejectedExecutionException

[Ragin-LundF]

Hi,

I'm getting always this exception when trying to call my API:

java.util.concurrent.RejectedExecutionException
	at org.jboss.threads.RejectingExecutor.execute(RejectingExecutor.java:38)
	at org.jboss.threads.EnhancedQueueExecutor.rejectShutdown(EnhancedQueueExecutor.java:2076)
	at org.jboss.threads.EnhancedQueueExecutor.execute(EnhancedQueueExecutor.java:793)
	at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.handle(VertxRequestHandler.java:87)
	at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.handle(VertxRequestHandler.java:42)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1212)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:163)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:141)
	at io.quarkus.vertx.http.runtime.VertxHttpRecorder$5.handle(VertxHttpRecorder.java:380)
	at io.quarkus.vertx.http.runtime.VertxHttpRecorder$5.handle(VertxHttpRecorder.java:358)
	at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1212)
	at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:163)
	at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:141)
	at io.quarkus.vertx.http.runtime.devmode.VertxHttpHotReplacementSetup$5.handle(VertxHttpHotReplacementSetup.java:196)
	at io.quarkus.vertx.http.runtime.devmode.VertxHttpHotReplacementSetup$5.handle(VertxHttpHotReplacementSetup.java:185)
	at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:141)
	at io.vertx.core.impl.future.FutureBase.lambda$emitSuccess$0(FutureBase.java:54)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:469)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:503)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:831)
	Suppressed: java.util.concurrent.RejectedExecutionException: Executor is being shut down
		at org.jboss.threads.EnhancedQueueExecutor.rejectShutdown(EnhancedQueueExecutor.java:2078)

The application is currently a simple test for a multi-project application with a Swagger-First approach.
It simply generates a JaxRS API interface, the API models as DTO and is supposed to call the "domain service" in a self-implemented controller that inherits from the interface with the REST annotations to get some data back.

Unfortunately, I don't even end up in the controller when I set a breakpoint there.
Yesterday it worked for a few minutes, but since then I can't run anything ;(.

Code can be found here: https://github.com/Ragin-LundF/quarkus-multiproject-default

[Ragin-LundF]

Has nobody an idea what this can be?

I tried also to create a simple class with an endpoint defined directly in the code (like all the tutorials show), but without success...

[Ragin-LundF]

I found a very weird solution for this issue, but I can't explain it...

In my initial implementation I had this implementation in the server part:

package io.github.ragin_lundf

import io.quarkus.runtime.QuarkusApplication
import io.quarkus.runtime.annotations.QuarkusMain

@QuarkusMain
class Application: QuarkusApplication {
    override fun run(vararg args: String?): Int {
        return 0
    }
}

It was required to start the application. Now I've changed all quarkus plugins in the submodules to apply(false):

plugins {
    id("io.quarkus") apply(false)
}

The only exception is the server submodule.
If I do remove the Application class from the server module, the application won't start or build correctly because it is unable to find a context:

Exception in thread "main" java.lang.RuntimeException: java.lang.NullPointerException: Cannot invoke "io.quarkus.deployment.dev.DevModeContext$ModuleInfo.getMain()" because the return value of "io.quarkus.deployment.dev.DevModeContext.getApplicationRoot()" is null
	at io.quarkus.deployment.dev.DevModeMain.start(DevModeMain.java:138)
	at io.quarkus.deployment.dev.DevModeMain.main(DevModeMain.java:62)
Caused by: java.lang.NullPointerException: Cannot invoke "io.quarkus.deployment.dev.DevModeContext$ModuleInfo.getMain()" because the return value of "io.quarkus.deployment.dev.DevModeContext.getApplicationRoot()" is null
	at io.quarkus.deployment.dev.DevModeMain.start(DevModeMain.java:90)
	... 1 more

After adding an empty class to the server part everything works fine...

Any idea why this happens (and why is the initial @QuarkusMain implementation not working)?