Linh Nguyen

Today's lesson: logging. I know, I know. "It's just printing stuff." Sure. And a forest fire is "just a candle". Let's talk.

So you've discovered the magical world of @Transactional, @Async, @Cacheable, and their friends? Wonderful. You're living in the future now.

Under the hood, Spring AOP works by wrapping your beans in proxy objects. Those fancy annotations only fire when a call passes through that proxy. Break the rules and Spring silently does nothing: no error, no warning, just broken behavior at 2 AM while your on-call phone buzzes and the server fans spin up to jet engine levels.

Listen, I'm just going to say it: dealing with date and time in programming is one of the circles of hell Dante forgot to mention. It's right there between "people who talk in movie theaters" and "folks who don't use version control."

What is defensive copy? What defensive copy?

So, Java is dead. Again. For the 4996th time this year, apparently.

If I got one dollar every time I heard that phrase, I would be richer than Elon Musk in a matter of months. Seriously, I could probably buy Twitter myself and rename it back to something sensible.

There's a "mantra" that gets chanted in developer circles like it's some sort of sacred incantation:

The synchronized keyword hurts performance.

You've probably repeated this wisdom during countless interviews, nodding sagely while the interviewer checks their mental scoreboard. But here's a wild thought:

Have you ever actually questioned why?

Look, I'm just going to say it: Java is always pass-by-value. No exception. Period. End of story.

Or how I learned from my silly mistakes when creating myself a common Maven dependency.

The quickest, cleanest, and easiest way to handle exceptions for requests in Spring Boot like a professional programmer in enterprises (or at least look like one).

Remember when you first learned JDBC? Yeah, neither do I. I've blocked it out like a traumatic childhood memory. Then JPA arrived like a hero we deserved. Or did we?