JavaLens FAQs

Question 1

What is JavaLens?

Accepted Answer

JavaLens is an MCP server offering 56 compiler-accurate semantic analysis, navigation, and refactoring tools for Java. It's built directly on Eclipse JDT Core, providing deep code understanding specifically designed for AI agents to interact with Java codebases.

Question 2

Why is JavaLens considered 'compiler-accurate'?

Accepted Answer

JavaLens leverages Eclipse JDT Core, the same powerful engine that powers the Eclipse IDE. This ensures it understands Java code with full type resolution, inheritance hierarchies, and classpath dependencies, providing insights equivalent to a compiler, far beyond simple text search.

Question 3

How does JavaLens specifically help AI agents?

Accepted Answer

AI agents often struggle with text-based analysis, leading to incorrect refactorings or missed usages. JavaLens provides fine-grained semantic understanding (e.g., distinguishing field reads from writes, specific reference types like casts or instantiations), enabling AI to perform safer, more precise code modifications and comprehensive analysis.

Question 4

How does JavaLens differ from the Language Server Protocol (LSP)?

Accepted Answer

While LSP offers basic IDE features like autocomplete, JavaLens goes much deeper. It provides 16 fine-grained reference types (like casts, annotations, instantiations), read vs. write access distinction, and advanced analysis/refactoring tools not available via standard LSP, which are crucial for complex AI agent workflows.

Question 5

Does JavaLens directly modify my Java project files?

Accepted Answer

No. JavaLens operates with an isolated workspace for its search indexes and compilation state, keeping your source project clean and free from Eclipse-specific files. All refactoring tools return precise text edits for your AI agent to apply, giving it controlled and auditable modification capabilities.

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