Feedback: Java RMI 2020

[rolandweber]

Please provide your feedback in the comments.

Due to irregular scheduling across the semester, there was a break of three weeks from the previous lecture to this session. I hadn't announced that we'd be doing the second debugging exercise, so students were not prepared. As most of them are not developing in Java on a regular basis, they had a cold start. My mistake, I should have announced it a week in advance.

I fell for #117 again. I thought there was no client IP check for JRMI, but I actually implemented it in 2019 (#91 #92).

Timeline:

• 10 min introduction to the exercise and looking up stubs in a catalog
• 7 min introduction to APIs, of the exercise and of Java RMI in general
• 16 min self-paced debugging
• 9 min demonstration how to fix the first problem (registry lookup)
• 13 min self-paced debugging
• 18 min break, while demonstrating how to disable the client IP check
• 10 min "Eight Fallacies of Distributed Computing" (unplanned)
  and demonstration how to fix the second problem (lookup ticket issuer)
• 10 min server code walkthrough: creating, exporting, registering the remotely callable objects
  and feedback gathering