Configuring the App Engine development server

Last week, I posted a way to preserve the local Datastore when using Maven by setting a system property datastore.backing_store=path. Although it’s not explicitly documented, it appears that many dev mode services can be configured this way. The configuration flags are documented with the local unit testing Javadocs like this one for LocalDatastoreService. Click on the property, then the link to Constant Field Values to find the associated String you can use in a -D argument as shown in last week’s post. Note that unit tests can configure services directly by calling setters on the test helper like LocalDatastoreServiceTestConfig.

Happy tweaking…

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