Hello Louise,
Your code starts with a “try { “ but doesn’t throw any exception. You might
be interested in the DatastoreTimeoutException as exemplified in the
“Handling Datastore Errors” online document
<https://cloud.google.com/appengine/articles/handling_datastore_errors>. A
sample statement looks like: catch (ConcurrentModificationException e).
To properly roll back your transaction, you may consider following the
examples provided in the “Transactions
<https://cloud.google.com/appengine/docs/standard/java/datastore/transactions?csw=1>”
document.
Because the Cloud Datastore API does not retry transactions, you may
consider adding logic so that your app provides the same functionality, in
your case to delete a number of entities, analogous to the
appengine/datastore/src/test/java/com/example/appengine/TransactionsTest.java
sample code from this document.
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