AI BriefingBreaking Up with a 7,000-Line PL/SQL Procedure: Migrating Claims Logic to a Java Module
Key point
Oliveyoung gradually migrated a hard-to-maintain, roughly 7,000-line PL/SQL procedure to a Java-based module using the Strangler Pattern.
Details
The Claims Squad, responsible for exchanges and returns at Oliveyoung's online mall, decided to migrate to Java in order to resolve a technical debt problem in which core business logic for orders, exchanges, returns, and more was tangled together inside a single PL/SQL procedure of over 7,000 lines.
The existing structure had blurry boundaries between pieces of code, meaning even small changes could lead to company-wide risk, and it had the fatal drawbacks of being hard to debug and highly dependent on specific personnel. To address this, the team adopted a strategy of applying the Strangler Pattern to gradually replace functionality while keeping the existing system running.
The migration proceeded through the following phases.
- Phase 0 (Preparation): Analyzing functionality by module and mapping transaction boundaries
- Phase 1 (Domain Modeling): Redefining domain boundaries by function and designing fallback logic
- Phase 2 (Module Migration): Implementing Java modules and validating with shadow traffic
- Phase 3 (Legacy Teardown): Removing unnecessary code after full cutover
Along the way, the team went through trial and error involving transaction inconsistencies and logic duplication, but ultimately achieved modularization by function, securing maintainability and scalability as a result.
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