Google App Engine本地数据存储区的IllegalStateException

Question

So I'm trying to run a Google App Engine with the Datastore locally to test and debug. The local App Engine seems to work on its own, as does the datastore emulator.

But as soon as I set the environment variables for the datastore emulator, and restart the local App Engine, it crashes with the error,

Caused by: java.lang.IllegalStateException: Must use project ID as app ID if project ID is provided. 

I've attached a more complete stack trace below

From the error message, I suspected I need to change my project id to the project name instead. So I tried replacing various instances of the project id with the project name where I could and unfortunately this did not work either.

Commands I'm running:

1. gcloud config set project PROJECT-ID
2. export ENDPOINTS_SERVICE_NAME=name.endpoints.PROJECT-ID.cloud.goog
3. gcloud beta emulators datastore start
4. $(gcloud beta emulators datastore env-init)
5. mvn appengine:run

I've put the stack trace on pastebin https://pastebin.com/atcnYwrq

Answer 1

我碰巧发现了一种解决此问题的方法。

export DATASTORE_USE_PROJECT_ID_AS_APP_ID=true

Answer 2

If anyone else stumbles into this error, I haven't fixed the original error but if you use the Remote API instead, it seems to setup a local datastore when RemoteCheck is false.

If you are using Objectify then you will need to use Remotely , setup the CustomFactory and register it and make sure you have something like the following in your web.xml

<filter-mapping>
    <filter-name>ObjectifyFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>INCLUDE</dispatcher>
    <dispatcher>FORWARD</dispatcher>
</filter-mapping>
<listener>
    <listener-class>com.packagename.OfyHelper</listener-class>
</listener>