Blog | LeetJourney

11 September 20263 min read

What Project Loom changes for a typical Spring web application, how to turn it on, and why synchronized blocks and ThreadLocal need a second look.

11 September 20263 min read

Why lazy collections blow up outside the transaction, and which of the four standard fixes is right for your case.

11 September 20265 min read

What actually happens between a request hitting Tomcat and your controller method running, and how to configure it without guessing.

11 September 20264 min read

The seven propagation modes in Spring, which two you actually need, and why REQUIRES_NEW deadlocks more often than people expect.

10 September 20263 min read

How @Cacheable actually works, why it silently does nothing half the time, and the invalidation rules that keep a cache honest.

10 September 20263 min read

The mechanism behind the magic: conditions, ordering, and how to see exactly why a bean did or did not appear.

9 September 20264 min read

Transient, managed, detached and removed. Understanding these explains most of the surprising things Hibernate does.

9 September 20263 min read

@SpringBootTest is not the only option. What @WebMvcTest and @DataJpaTest load, and why your test suite is slow without them.

8 September 20263 min read

What the compiler actually enforces, why modern Java leans unchecked, and how to stop losing stack traces.

8 September 20264 min read

The rules both methods have to follow together, what breaks when they do not, and why JPA entities are a special case.

8 September 20263 min read

The three rules for Optional, why it does not belong on fields or parameters, and the methods that replace your if statements.

8 September 20263 min read

How a stream pipeline actually executes, the collectors worth memorising, and the cases where a for loop is still the right answer.