Matthew Buckett

The stack trace we were seeing: ``` java.lang.NullPointerException: null at java.util.Objects.requireNonNull at java.util.Arrays$ArrayList. at java.util.Arrays.asList at software.amazon.awssdk.services.ses.model.Destination$BuilderImpl.toAddresses(Destination.java:391) at io.awspring.cloud.ses.SimpleEmailServiceMailSender.prepareMessage(SimpleEmailServiceMailSender.java:114) at io.awspring.cloud.ses.SimpleEmailServiceMailSender.send(SimpleEmailServiceMailSender.java:84) at io.awspring.cloud.ses.SimpleEmailServiceMailSender.send(SimpleEmailServiceMailSender.java:74) [..snipped..] ```

I had a similar issue where I was trying to debug some caching behaviour of `fetch()` in a pages function and allowing remote development would have simplified this.

Using the dashboard playground as outlined on: https://developers.cloudflare.com/workers/learning/playground/#using-the-playground allows quick iterating on code that runs on CF servers and may be helpful in some cases.

@klinck I wonder if you're seeing the same problem as I was (reported in #12190) of not registering all the Jackson Modules for Spring Security.

Just for reference we are now using `io.sentry.util.CheckInUtils#withCheckIn(java.lang.String, java.util.concurrent.Callable)` to handle the checkin to sentry as we have the same code run under different cron monitor and so can't use...

> hi! Thanks for the report! Can you please make the codesandbox link public? Sorry about that @matyasf everyone should have access now.