How to specify legacy incremental IDs with Java

Question

I'm using GAE 1.8.1 and I've hit an issue with Objectify with the new scattered ID system. At least I think it's Objectify, I'm not sure (Using Objectify 4 RC1). I'm getting this..

Caused by: java.lang.IllegalArgumentException: id cannot be zero
    at com.google.appengine.api.datastore.KeyFactory.createKey(KeyFactory.java:52)
    at com.google.appengine.api.datastore.KeyFactory.createKey(KeyFactory.java:47)
    at com.googlecode.objectify.Key.<init>(Key.java:91)
    at com.googlecode.objectify.Key.create(Key.java:39)
    at com.googlecode.objectify.impl.cmd.LoadTypeImpl.id(LoadTypeImpl.java:77)

The records get put in the datastore correctly as they have an ID, but this is on fetching the data out.

So I have to roll back to what it was before for the time being. It states here that you can specify the legacy ID generation with modifying the auto_id_policy in appengine-web.xml. I've tried adding this to the file:

<auto-id-policy>legacy</auto-id-policy>

But it doesn't work, or at least it might work if the XSD it validates against supports this tag. You can't deploy the app because of this.

Answer 1

we are aware of this issue and working on a fix.