Merge pull request quarkusio#35930 from mkouba/document-shutdown-anno

Document usage of io.quarkus.runtime.Shutdown annotation

Author: mkouba

docs/src/main/asciidoc/lifecycle.adoc

@@ -190,6 +190,7 @@ A bean represented by a class, producer method or field annotated with `@Startup
 ----
 package org.acme.lifecycle;
 
+import io.quarkus.runtime.Startup;
 import jakarta.enterprise.context.ApplicationScoped;
 
 @Startup // <1> 
@@ -210,6 +211,57 @@ NOTE: `@Dependent` beans are destroyed immediately afterwards to follow the beha
 
 TIP: If a class is annotated with `@Startup` but with no scope annotation then `@ApplicationScoped` is added automatically.
 
+The `@Startup` annotation can be also declared on a non-static non-producer no-args method:
+
+[source,java]
+----
+package org.acme.lifecycle;
+
+import io.quarkus.runtime.Startup;
+import jakarta.enterprise.context.ApplicationScoped;
+
+@ApplicationScoped
+public class EagerAppBean {
+  
+   @Startup
+   void init() { <1>
+     doSomeCoolInit(); 
+   }
+}
+----
+<1> The bean is created and the `init()` method is invoked upon the contextual instance when the application starts.
+
+[[shutdown_annotation]]
+=== Using `@Shutdown` to execute a business method of a CDI bean during application shutdown
+
+The `@io.quarkus.runtime.Shutdown` annotation is used to mark a business method of a CDI bean that should be executed during application shutdown. 
+The annotated method must be non-private and non-static and declare no arguments.
+The behavior is similar to a declaration of a `ShutdownEvent` observer.
+The following examples are functionally equivalent.
+
+[source,java]
+----
+import io.quarkus.runtime.Shutdown;
+import io.quarkus.runtime.ShutdownEvent;
+import jakarta.enterprise.context.ApplicationScoped;
+
+@ApplicationScoped
+class Bean1 {
+   void onShutdown(@Observes ShutdownEvent event) {
+      // place the logic here
+   }
+}
+
+@ApplicationScoped
+class Bean2 {
+
+   @Shutdown
+   void shutdown() {
+      // place the logic here
+   }
+}
+----
+
 == Package and run the application
 
 Run the application with: