Course catalog

Concurrency and Structured Tasks

Executors, structured concurrency, and backpressure patterns for services that behave under load.

7 weeks · 9h/week

JPY 168,000

Data Access with JDBC and jOOQ

SQL discipline, connection pooling, and type-safe queries for teams allergic to magic ORMs.

5 weeks · 7h/week

JPY 88,000

Enterprise Patterns in Practice

Hexagonal boundaries, domain events, and pragmatic CQRS slices with Java-friendly examples.

9 weeks · 8h/week

JPY 185,000

Gradle Enterprise Builds

Author multi-module builds, share convention plugins, and shorten feedback loops responsibly.

4 weeks · 5h/week

JPY 54,000

Intensive Java Engineering Bootcamp

Full-time style sprint combining language, Spring, testing, and delivery rituals over twelve weeks.

12 weeks · 25h/week

JPY 220,000

Java 21 Language Core Intensive

Syntax refresh, records, pattern matching, and virtual threads with weekly mentor reviews on your exercises.

6 weeks · 8h/week

JPY 98,000

Java Security Essentials for APIs

OAuth2 flows, JWT handling cautions, and practical threat modeling for Spring-heavy shops.

5 weeks · 7h/week

JPY 112,000

JUnit 5, Mockito, and Contract Tests

Layered testing strategy from pure units to consumer-driven contracts without brittle suites.

5 weeks · 6h/week

JPY 72,000

Microservice Boundaries with Spring Cloud

Service discovery, resilient clients, and gateway policies with a skeptical eye toward sprawl.

7 weeks · 9h/week

JPY 176,000

OCA Java SE 17 Study Studio

Exam-aligned drills with spaced repetition and mentor clarifications on ambiguous wording.

10 weeks · 5h/week

JPY 62,000

Profiling and JVM Performance Tuning

GC logs, async profilers, and allocation forensics you can repeat after the course ends.

6 weeks · 8h/week

JPY 132,000

Spring Boot APIs for Production

Controllers, validation, OpenAPI, and deployment hygiene for services your team can operate overnight.

8 weeks · 10h/week

JPY 148,000