java

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Ensure that Java types are documented with Javadoc comments and follow best practices for documentation.

Get best practices for JUnit 5 unit testing, including data-driven tests

Generate a complete, production-ready MCP server in Java using the official Java SDK with Maven or Gradle.

You are an expert in refactoring Java methods.

Refactoring using Remove Parameter in Java Language

Get best practices for developing applications with Spring Boot.

Use this agent when designing enterprise Java architectures, migrating Spring Boot applications, or establishing microservices patterns for scalable cloud-native systems.

Java/Maven/Gradle build, compilation, and dependency error resolution specialist. Fixes build errors, Java compiler errors, and Maven/Gradle issues with minimal changes. Use when Java or Spring Boot builds fail.

Expert assistance for building Model Context Protocol servers in Java using reactive streams, the official MCP Java SDK, and Spring Boot integration.

Expert Java and Spring Boot code reviewer specializing in layered architecture, JPA patterns, security, and concurrency. Use for all Java code changes. MUST BE USED for Spring Boot projects.

Master Java 21+ with modern features like virtual threads, pattern matching, and Spring Boot 3.x. Expert in the latest Java ecosystem including GraalVM, Project Loom, and cloud-native patterns. Use PROACTIVELY for Java development, microservices architecture, or performance optimization.

Use when building enterprise Java applications with Spring Boot 3.x, microservices, or reactive programming. Invoke for WebFlux, JPA optimization, Spring Security, cloud-native patterns.

Systematic code review for Java with null safety, exception handling, concurrency, and performance checks. Use when user says "review code", "check this PR", "code review", or before merging changes.

Java coding standards for Spring Boot services: naming, immutability, Optional usage, streams, exceptions, generics, and project layout.

Orchestrate end-to-end Java Spring Boot feature development from idea or plan to reviewed, committed code. Use this skill proactively when the user wants to implement a feature, endpoint, service, domain object, or integration in a Spring Boot application — even if they just say "implement this", "add this endpoint", "build this service", "develop this plan", or "create this API". Spawns parallel specialist subagents for codebase exploration, architecture planning, Spring Boot implementation, testing, and code review, then guides the user through approval, commit, and optional PR creation.

Use jackknife Maven plugin to explore JARs, search types and members, decompile classes, inspect annotations, and instrument bytecode. Trigger when the user needs to: investigate a JAR or dependency; find where a specific class, interface, annotation, or package is defined; locate which JAR provides a type (ClassNotFoundException, NoSuchMethodError, classpath conflicts); decompile or inspect bytecode of a class.

JPA/Hibernate patterns for entity design, relationships, query optimization, transactions, auditing, indexing, pagination, and pooling in Spring Boot.

JVM performance tuning guide — heap size configuration, GC selection, Kubernetes CPU throttling, and Prometheus monitoring. Use when optimizing Java applications, configuring the JVM for containers or Kubernetes, choosing the right Garbage Collector (G1, ZGC, ParallelGC), diagnosing memory or latency issues, or understanding Spring Boot executor metrics.

Use when building Spring Boot 3.x applications, microservices, or reactive Java applications. Invoke for Spring Data JPA, Spring Security 6, WebFlux, Spring Cloud integration.

Spring Security best practices for authn/authz, validation, CSRF, secrets, headers, rate limiting, and dependency security in Java Spring Boot services.

Complete guide to testing in Spring Boot — unit tests with Mockito, controller tests (MockMVC standalone, @WebMvcTest, MockMvcTester, @SpringBootTest, WebTestClient), JPA repository tests, Testcontainers, Spring Cloud Contract, and stress testing. Use when writing or reviewing any Spring Boot test.

Verification loop for Spring Boot projects: build, static analysis, tests with coverage, security scans, and diff review before release or PR.