This is the Spring Tools 4 (STS4) repository, a comprehensive set of IDE tooling for Spring Boot development. It provides language servers (LSP) for Spring Boot (Java, YAML, properties, XML), Concourse CI, BOSH, and Cloud Foundry manifests, along with Eclipse plugins and VS Code extensions. The architecture separates headless language servers (built as Spring Boot applications) from IDE-specific frontends, with shared commons libraries for YAML, Java project indexing, metadata, and live process monitoring via Actuator. The codebase is professional and well-structured but shows signs of organic growth over a decade, with some code duplication between the Eclipse and headless/VS Code paths, deprecated API usage, and developer-specific hardcoded paths. It is actively maintained by VMware/Spring engineering team with strong CI/CD pipelines.