Merge pull request #45217 from geoand/startup-profiling

Add tip about startup profiling

Author: gsmet

TROUBLESHOOTING.md

@@ -133,6 +133,31 @@ Stop the application with `CTRL+C` once you have gathered what you want (e.g. ju
 It will dump the profiling information.
 The name of the file is in the `file=` parameter.
 
+> [!TIP]  
+> You can avoid needing to stop the application manually by writing a custom main that stops the application once it boots up
+> 
+> ```java
+> import io.quarkus.runtime.Quarkus;
+> import io.quarkus.runtime.QuarkusApplication;
+> import io.quarkus.runtime.annotations.QuarkusMain;
+>
+> @QuarkusMain
+> public class Main {
+>
+>     public static void main(String... args) {
+>         Quarkus.run(MyApp.class, args);
+>     }
+> 
+>     public static class MyApp implements QuarkusApplication {
+> 
+>         @Override
+>         public int run(String... args) throws Exception {
+>             return 0;
+>         }
+>     }
+> }
+```
+
 For the allocation case, you obtain a JFR file, you can convert it to your typical Async Profiler flamegraph HTML output with:
 
 ```shell script