fix: Port already Bind Error

zio-quickstart-restful-webservice/build.sbt

@@ -14,3 +14,5 @@ libraryDependencies ++= Seq(
 )
 
 resolvers ++= Resolver.sonatypeOssRepos("snapshots")
+
+Compile / mainClass := Some("dev.zio.quickstart.MainApp")

zio-quickstart-restful-webservice/src/main/scala/dev/zio/quickstart/MainApp.scala

@@ -13,16 +13,33 @@ import zio.http._
 
 object MainApp extends ZIOAppDefault:
   def run =
-    Server
-      .serve(
-        GreetingRoutes() ++ DownloadRoutes() ++ CounterRoutes() ++ UserRoutes()
-      )
-      .provide(
-        Server.defaultWithPort(8080),
+    for {
+      serverFiber <- Server
+        .serve(
+          GreetingRoutes() ++ DownloadRoutes() ++ CounterRoutes() ++ UserRoutes()
+        )
+        .provide(
+          Server.defaultWithPort(8080),
 
-        // An layer responsible for storing the state of the `counterApp`
-        ZLayer.fromZIO(Ref.make(0)),
+          // An layer responsible for storing the state of the `counterApp`
+          ZLayer.fromZIO(Ref.make(0)),
 
-        // To use the persistence layer, provide the `PersistentUserRepo.layer` layer instead
-        InmemoryUserRepo.layer
-      )
+          // To use the persistence layer, provide the `PersistentUserRepo.layer` layer instead
+          InmemoryUserRepo.layer
+        )
+        .fork
+
+      // Add a shutdown hook to release the port on exit
+      _ <- ZIO.succeed {
+        java.lang.Runtime.getRuntime.addShutdownHook(new Thread {
+          override def run(): Unit = {
+            Unsafe.unsafe { implicit u =>
+              Runtime.default.unsafe.run(serverFiber.interrupt)
+            }
+          }
+        })
+      }
+
+      // Wait for the server to exit
+      _ <- serverFiber.join
+    } yield ()