Stop Claude Code Interface Blindness: Hook Eclipse JDT LS via MCP for AST-Aware Java Refactoring

Claude Code is a beast in the terminal, but letting it raw-grep your enterprise Spring Boot codebase is a recipe for hallucinated method signatures and broken builds. If your AI agent doesn't understand the Abstract Syntax Tree (AST) of your decoupled interfaces, it is simply guessing.

@Qualifier

annotations.PaymentGateway

interface to its StripePaymentServiceImpl

implementation across deep Gradle subprojects without semantic AST help.Expose your local Eclipse JDT Language Server (JDT LS) to Claude Code using an MCP wrapper to enable precise, compiler-grade semantic searches.

eclipse.jdt.ls

as a background daemon on your local development machine.mcpConfig.json

to route Java-specific queries like find-implementations

directly to the JDT LS instance.@Autowired

bean hierarchies before generating refactoring diffs.Want to go deeper?

[javalld.com]— machine coding interview problems with working Java code and full execution traces.

This mcpConfig.json

configuration bridges Claude Code to your local JDT LS instance, giving the LLM direct access to Java's compiler APIs:

{
  "mcpServers": {
    "jdtls-ast-bridge": {
      "command": "node",
      "args": ["/usr/local/bin/jdtls-mcp-bridge.js"],
      "env": {
        "JDTLS_PATH": "/opt/eclipse.jdt.ls/plugins/org.eclipse.equinox.launcher_1.6.900.jar",
        "WORKSPACE_DIR": "${userHome}/projects/enterprise-app"
      }
    }
  }
}