Issues accessing backend API deployed in App Engine

[ks songs]

Hi All,

I have a set of Backend springboot application deployed successfully deployed in the APP engine. However, when i tried to access the one of the backend API in the postman, the request does not return, the postman remains in "sending request" for a long time.

As you can see from the GCP logs below, my backed service is running.

May i know if anyone encounter the same issue before whereby the service is deployed successfully in the APP engine, but request cannot be made and no timeout is thrown either. 

Thanks in advance!

Regards

[Elliott (Cloud Platform Support)]

Hello,

I understand that when you are placing a request using postman, it remains in “sending request” for a long time.

I am unable to find a common issue at this time that would cause the behavior you are describing. Also, Google Groups is meant for general discussions.

To move this along and narrow down the focus, I would suggest while sending your request, open Postman Console (View > Show Postman Console), resend the request and check for any error logs in the console. 

This way, we will be able to get extra information that may help isolate the problem.

[ks songs]

Hi,

After further investigation, i saw the following error in the logs

"Start program failed: failed to detect app after start: ForAppStart(): [aborted, context canceled. subject:\"app/valid\" Timeout:30m0s, attempts:119980 aborted, context canceled. subject:\"app/invalid\" Timeout:30m0s, attempts:119997]",

Greatly appreciate if anyone could give insights on this error. THanks!

[Daniel (Google Cloud Support)]

That error message usually points out that your application starting a webserver and handling requests correctly [1]. There is an example on how to deploy a Springboot application for Google App Engine Java 11 runtime here [2] (the repository is here [3]). I'd strongly advise you to check [2] and [3] and most importantly make sure that your application is running locally without any issues [4] prior to deploying to App Engine.

[1] https://cloud.google.com/appengine/docs/standard/java11/how-requests-are-handled#handling_requests
[2] https://cloud.google.com/appengine/docs/standard/java11/quickstart

[3] https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/appengine-java11/springboot-helloworld

[4] https://cloud.google.com/appengine/docs/standard/java11/testing-and-deploying-your-app

[behavin behavin]

Hi,

I have already tried to deploy my springboot app (Just only public REST API) and I had some "start" issues too.

I don't know how much do you know about app engine instance settings, scaling,.. in app.yaml file. A lot of issues could be resolved by the correct instance settings. Choose right instance class, start timeouts etc. 

I have problems with restarting my app during starting (several times). After I change instance class, set timeouts for liveness and readines check requests is my app stable now.

I would like to get to know more information about this environment and settings. I think it could be a good idea to share knowledge together.

If you want , write me.

I would like to know:

- In which log did you find the error message? "Start program failed: failed to detect app after start:....  

  in group of logs :  gcloud app logs tail -s default   ???

- how big is your app? (mine 100MB) and how long will it take to run (on localhost and on gcp)??

- could you send me app.yaml?

Bye

Jaromír

po 25. 1. 2021 v 11:05 odesílatel ks songs <song...@gmail.com> napsal:

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[ks songs]

Hi Jaromir,

Thanks for your reply.

1) I found the error via the Logs Explorer in the GCP logging page

2) My app is less than 50MB, it is just a set of backend REST API. Though it started (as mentioned in my original post), i am unable to make requests to it and subsequently i saw the "start" error in the logs. On local host, startup takes around 5-10 seconds.

3) Attached is my app.yaml file.  Did not know that there are other settings i need to take care in the yaml file.

Appreciate if you can send me your yaml file for reference too.

Thank you so much.

Regards

DD

[gonzalezwalter]

Hello,

I would recommend following the documentation [1] mentioned above to create a test spring boot application and then compare to your own.  This will help in making sure everything is being deployed correctly.  

[1]: https://cloud.google.com/appengine/docs/standard/java11/quickstart

[behavin behavin]

Hi,

did you get my email? I wrote you directly on email:  songsk....

How is going, anything new?

J.

Dne pátek 29. ledna 2021 v 9:40:02 UTC+1 uživatel song...@gmail.com napsal: