@codemirror/lang-java

The @codemirror/lang-java package delivers exactly what it promises: straightforward Java syntax highlighting and language features for CodeMirror 6. Setup is refreshingly simple—import `java()` and add it to your language configuration. The TypeScript types are well-defined, making IDE autocomplete work seamlessly. The parser handles modern Java syntax reliably, including newer language features like records and pattern matching.

The API surface is intentionally minimal, which is both a strength and limitation. You get syntax highlighting, basic code folding, and indentation out of the box with zero configuration. However, if you need advanced features like custom syntax rules or deep AST manipulation, you'll need to work with the underlying Lezer grammar directly, which has a steeper learning curve.

Documentation follows CodeMirror's standard pattern—concise reference docs that assume familiarity with the CodeMirror ecosystem. The examples in the main CodeMirror docs translate well to Java-specific usage, but there's minimal Java-specific guidance beyond the basic setup example.

This package does exactly what it says with minimal fuss. It's a thin layer providing Java syntax highlighting and basic language features for CodeMirror 6. In production, it's refreshingly low-maintenance—no connection pooling concerns, no retry logic needed, just pure client-side parsing. The bundle size is reasonable (~50KB parsed) and tree-shaking works well if you're selective about imports.

From an operational perspective, the main thing to understand is that this is a syntax package, not a full LSP client. It won't handle complex autocomplete or type checking—that's on you to wire up separately if needed. Performance is solid even with large files (tested up to 10K lines without noticeable lag). Memory consumption is predictable and stays bounded since it's just maintaining parse state.

The API is straightforward: import `java()` and pass it to your language configuration. No complex initialization, no configuration pitfalls. Breaking changes between CodeMirror 6 versions can require updates, but the package maintainers keep pace reasonably well. Error handling is non-existent because there's nothing that can really fail—it just parses what you give it.

The @codemirror/lang-java package does exactly what it promises with minimal fuss. In production, it's been remarkably lightweight - no noticeable memory bloat even with multiple editor instances open simultaneously. The syntax highlighting is accurate and the parser handles large Java files (10k+ lines) without performance degradation. Integration is dead simple: import `java()` and add it to your language configuration.

From an operations perspective, this package has no external API calls, no connection pooling concerns, and zero runtime dependencies beyond the core CodeMirror ecosystem. It's purely client-side parsing with predictable resource usage. Error handling is mostly handled by CodeMirror's infrastructure - malformed Java code won't crash the editor, which is critical for production stability.

The main limitation is that it's syntax highlighting only - no LSP integration, no autocomplete, no refactoring tools. For code review interfaces or read-only documentation sites, it's perfect. For full IDE functionality, you'll need to layer on additional tooling yourself, which can get complex when managing multiple services.