- Annotation Processor
- JVM
- class loader
- garbage collection
- build tool's role in deployment
- jar
- container(docker)
- concurrent with thread pool (executorService)
- daemon thread
- Java Memory Model(JMM)
- Lock(interface)
- ReentrantLock
- Latch, Barrier
- HTTP 2.0 stream
- QUIC
- HandlerMapping, HandlerAdapter with Application Context