Java Frameworks & Libraries¶

Status: 🟢 Active | Owner: Java Guild

Web / Application Frameworks¶

Framework	Status	Use Case
Spring Boot 3.2.x	✅ Required	All new Java services
Quarkus 3.x	⚠️ Evaluate	GraalVM native image scenarios — Architecture approval required
Micronaut	⚠️ Evaluate	Evaluate case-by-case
Dropwizard	❌ Not approved	Legacy only; migrate away
Spring Boot 2.x	❌ Deprecated	Must migrate to 3.2.x
Jakarta EE / WildFly	❌ Not approved	Do not introduce

Spring Boot 3.2.x is the only approved choice for new services. See Spring Boot Standards for detailed configuration.

Library	Status	Notes
JUnit 5	✅ Required	Base test framework
AssertJ	✅ Required	Fluent assertions — preferred over JUnit's built-in assertions
Mockito 5.x	✅ Required	Mocking
Testcontainers	✅ Required	Integration tests with real infrastructure
WireMock	✅ Approved	HTTP API mocking
Spring Boot Test	✅ Required	`@SpringBootTest`, `@WebMvcTest`, `@DataJpaTest` slices
Awaitility	✅ Approved	Asynchronous test assertions
JUnit 4	❌ Deprecated	Migrate to JUnit 5

Library	Status	Notes
Spring Data JPA + Hibernate 6	✅ Preferred	Standard ORM
jOOQ	✅ Approved	Complex SQL, type-safe query building
Flyway	✅ Required	Database migrations
Spring Data JDBC	✅ Approved	Lighter alternative to JPA for simple schemas
MyBatis	⚠️ Legacy	Existing projects only

Library	Status	Notes
Spring Kafka	✅ Required	Kafka producers and consumers
Spring AMQP (RabbitMQ)	✅ Approved	RabbitMQ integration
AWS SQS via Spring Cloud AWS	✅ Approved	SQS consumers on AWS

Library	Status	Notes
Micrometer (Prometheus registry)	✅ Required	Metrics
Micrometer Tracing + OTel bridge	✅ Required	Distributed tracing
Logback + Logstash encoder	✅ Required	Structured JSON logging

Last reviewed: 2025-Q4 | Owner: Java Guild