Hello everyone and thanks up front for your time, I am working on a

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Asked: June 13, 20262026-06-13T13:44:20+00:00 2026-06-13T13:44:20+00:00

Hello everyone and thanks up front for your time, I am working on a

0

Hello everyone and thanks up front for your time,

I am working on a java-based GAE web application and now and then I get ApiProxy.ApplicationExceptions.

In the current case they appear randomly and come with the applicationError 108 when I open a write channel to a blob using the (yes I know, still experimental) FileStore API. Although the API is still in an experimental state, I’d like to handle the thrown exception correctly. Thus my question:

Where can I find a list of possible application errors including their descriptions?

As of right now it is not possible for me to figure out where the problem resides since the thrown exception does not contain something like a message, hint or reason phrase but only the error ID 108:

Caused by: com.google.apphosting.api.ApiProxy$ApplicationException: ApplicationError: 108: 
    at java.lang.Thread.getStackTrace(Thread.java:1495)
    at com.google.apphosting.runtime.ApiProxyImpl.doSyncCall(ApiProxyImpl.java:240)
    at com.google.apphosting.runtime.ApiProxyImpl.access$000(ApiProxyImpl.java:66)
    at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:183)
    at com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:180)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:180)
    at com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:66)
    at com.googlecode.objectify.cache.TriggerFutureHook.makeSyncCall(TriggerFutureHook.java:154)
    at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:107)
    at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:56)
    at com.google.appengine.api.files.FileServiceImpl.makeSyncCall(FileServiceImpl.java:584)
    ... 65 more

Also, the corresponding javadoc is quite conservative with giving information: https://developers.google.com/appengine/docs/java/javadoc/com/google/apphosting/api/ApiProxy.ApplicationException

Currently I bluntly cancel these requests with a 500, but since I am not sure what has happened I should probably do something else/more.

Thanksalot!