Add COBOL-to-Java Visualization Tool #3
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- Convert 29 COBOL programs to modern Java/Spring Boot - Implement 16 business logic services - Add 4 REST API controllers (Account, Customer, Transfer, Menu) - Create 3 JPA entities with H2 database support - Include 14 comprehensive tests (all passing) - Add COBOL traceability comments for maintainability Architecture: - Spring Boot 2.7.14 with Spring Data JPA - REST APIs replace 3270 BMS screens - JPA repositories replace VSAM file I/O - Exception hierarchy replaces CICS error handling - Database sequences replace Named Counters Key improvements: - 89% code reduction (25,566 → 2,751 lines) - Type-safe with compile-time checks - Testable with dependency injection - Scalable stateless REST architecture - Industry-standard frameworks Co-authored-by: openhands <[email protected]>
Implemented critical missing business rules from COBOL programs: 1. CREACC (CreaccService.java): - Added account type validation (ISA, MORTGAGE, SAVING, CURRENT, LOAN only) - Added maximum 10 accounts per customer limit check - Fixed initial balance handling to use input values if provided - Changed transaction type from 'CRE' to 'OCA' to match COBOL - Enhanced transaction description format with customer number, account type, and statement dates 2. DBCRFUN (DbcrfunService.java): - Added restriction preventing debits from MORTGAGE/LOAN accounts - Added restriction preventing credits to MORTGAGE/LOAN accounts - These restrictions reflect business rules that mortgage/loan transactions require proper payment channels 3. AccountRepository: - Added countByCustomerNumber() method for account limit checking All changes reference specific COBOL line numbers for traceability. All 14 tests pass successfully. Co-authored-by: openhands <[email protected]>
This commit introduces a Flask-based web application that visualizes the mapping between COBOL legacy code and modern Java implementations. Features: - Tree-sitter based Java parser to extract functions and COBOL references - Side-by-side comparison view with syntax highlighting (Pygments) - Automatic extraction of COBOL code snippets based on line references - Clean, responsive UI for easy navigation - Support for multiple COBOL references per Java function The tool scans Java files for COBOL reference comments (e.g., '// COBOL equivalent: CREACC.cbl 287-307') and displays the corresponding COBOL source code alongside the Java implementation. Technical details: - Python Flask web framework - Tree-sitter for Java AST parsing - Pygments for syntax highlighting - Supports 42 Java files with COBOL mappings Co-authored-by: openhands <[email protected]>
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Summary
This PR introduces a Flask-based web application that visualizes the mapping between COBOL legacy code and modern Java implementations. The tool helps developers understand the conversion process by displaying side-by-side comparisons of COBOL and Java code with syntax highlighting.
Features
How It Works
The tool scans Java files for COBOL reference comments (e.g.,
// COBOL equivalent: CREACC.cbl 287-307) and:Technical Stack
Usage
cd cobol-java-viewer pip install -r requirements.txt python app.pyThen navigate to
http://localhost:12000to view the visualization.Screenshots
The application currently supports 42 Java files with COBOL mappings, providing a comprehensive view of the conversion process.
Files Added
cobol-java-viewer/app.py- Main Flask applicationcobol-java-viewer/requirements.txt- Python dependenciescobol-java-viewer/README.md- Documentation and setup instructionscobol-java-viewer/templates/- HTML templates for the web UIcobol-java-viewer/.gitignore- Python-specific ignore patternsTesting
The application has been tested with all Java files in the repository that contain COBOL reference comments. It successfully:
@neubig can click here to continue refining the PR