Python 2.7.12 + dev_appserver.py does not suports java8

Question

I'm trying to run an appengine module with the command below:

• $ python /usr/lib/google-cloud-sdk/platform/google_appengine/dev_appserver.py --max_module_instances = 1 --jvm_flag = "- agentlib: jdwp = transport = dt_socket, server = y, suspend = n, address = 9999 "target / security-authentication-1.0.0-SNAPSHOT --dev_appserver_log_level = debug

But I'm getting this error:

• DEBUG 2018-02-22 14: 15: 27,450 appengine_rpc.py:170] Server: appengine.google.com
• ERROR 2018-02-22 14: 15: 27,452 sdk_update_checker.py:201] The requested api_version (1.0) is not supported by the java8 runtime in this release of the SDK. The supported api_versions are ['1'].

How do I solve this problem?

Here is some information: $ gcloud -v

• Google Cloud SDK 190.0.0
• alpha 2017.12.08
• app-engine-java 1.9.62
• app-engine-python 1.9.67
• beta 2017.12.08
• bq 2.0.29
• core 2018.02.16
• gsutil 4.28

$ python --version

• Python 2.7.12

Answer 1

The error message suggests you may have used an api_version other than 1. From the api_version row in the Syntax table:

At this time, App Engine has one version of the python27 runtime environment: 1

Make sure you have this in your app.yaml, not something else:

api_version: 1

You also have both the Python and Java development tools installed in your SDK and using some arguments which are specific to the Java development server, that might not work (well) with the Python development server you're attempting to invoke. See the Python Using the Local Development Server and Local Development Server Options vs Using the Java Local Development Server.