As I was working on a demo for one of my talks at Devoxx, I was encountering a bug in my Groovy code (a Gaelyk app using Glide). I had deployed a new version of my App Engine app, changing some code to persist some data in the Datastore. After those changes, I saw a trace in the logs:

Looks like there’s an error in receiveTweet.groovy on line 11. And there’s a link! Although I hadn’t linked the source code to the application, I was surprised to see this link. But I knew that Stackdriver is able to pick up sources in different ways (from uploaded local files, from a Google code source repository, from Github or BitBucket, or with a “source capture”).