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How to overcome the maintenance difficulties caused by the lack of documentation for legacy systems?

2025-08-20 254

Applying Nia AI's Code Semantic Analysis to Reconstruct System Knowledge

For poorly documented legacy systems, Nia offers the following practical approach:

  • Automated Document Generation: Analyze the code structure and then automatically produce module descriptions that contain:
    • Description of key function usage
    • Interface I/O Specifications
    • Description of key business processes
  • intelligent question and answer (Q&A) supplement: support for asking deep technical questions such as "why is this function locked here", and Nia will infer the answer from the code context
  • Change impact analysis: Run the "impact" command before modifying the code to get a list of other modules that may be affected.

Specific operations:

  1. Full indexing of legacy code base (nightly implementation recommended for large projects)
  2. Use the "doc generate" command to create a preliminary document framework.
  3. Interactive refinement of details via the "explain" command
  4. Deposit the output documents in the project wiki to form a knowledge deposit.

A customer case study shows the use of this method to create 90% completeness of technical documentation for a 10 year old Java system in 3 weeks. Periodic re-indexing is recommended to keep the information synchronized.

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