Setting OmitStackTraceInFastThrow in GAE Standard Java 8

[Kishu Agarwal]

Is there a way to set this jvm flag OmitStackTraceInFastThrow on prod instances? And for that matter, how can we set our own jvm flags in production?

[George (Cloud Platform Support)]

Hello Kishu, 

To set runtime arguments for JVM, you use the env_variables key in the app.yaml file. For more detail, you may have a look at the "The Java 8 / Jetty 9 Runtime" online documentation page, "Environment variables" sub-chapter. 

[Kishu Agarwal]

But that is applicable for Flexible environment. I want to set this flag in Standard environment.

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[Mohammad I (Cloud Platform Support)]

Hello Kishu,

You are right to point out that “Environment Variables” can be set in the Flex environment only as outlined in the document shared by my colleague earlier. Under the Standard environment a user has no control on the JVM or any ability to modify the runtime environment. If a user needs more control he/she needs to use the Flexible environment to have more control on the JVM. See the following link to see the differences between Flexible environment and Standard environment.

Choosing your App Engine environment

However if you need to use the Flexible environment, you do not need to migrate your entire app to the Flexible environment.  Instead you can create a micro service under the Flexible environment to serve your needs. Your existing service running in the standard environment can call the other services using HTTP, Cloud Tasks alpha, or Cloud Pub/Sub. Please see the following link for details.

When to use the flexible environment

[Kishu Agarwal]

Hey Mohammad I,

Thanks for the information. I will surely look into it.