Apache Struts

Apache Struts is a legacy Java framework maintained by the Apache Software Foundation. Because it is open-source and free to download under the Apache License 2.0, there are no direct 'per-seat' licensing costs b2saas.com. However, the true cost for CFOs and CTOs lies in the massive technical debt, security maintenance, and the high salaries of specialized Java developers required to maintain aging Struts 2 codebases. The framework has a historical reputation for critical security vulnerabilities, such as OGNL injection, which require constant patching and oversight github.com.

Specific development functions are being aggressively replaced by GenAI-powered modernization platforms. Tools like Legacyleap use coordinated AI agents to automate up to 70% of the migration from legacy Struts to modern Spring Boot architectures legacyleap.ai. Furthermore, AI coding assistants like GitHub Copilot and Claude Code can now interpret complex Struts Action mappings and XML configurations to refactor them into modern RESTful APIs, effectively automating the routine 'plumbing' that previously required senior-level engineering hours.

While AI can refactor code, certain functions remain difficult to automate fully, specifically the validation of complex, undocumented business logic buried in legacy JSPs and custom interceptors. Ensuring 100% functional parity during a migration still requires human-in-the-loop oversight to manage edge cases in session handling and state management that AI might misinterpret. However, the emergence of 'QA & Validation Agents' is rapidly closing this gap by generating automated regression test suites directly from the legacy source legacyleap.ai.

From a financial perspective, maintaining a Struts application for 500 users doesn't carry a license fee, but the 'maintenance tax' is high. A typical modernization project that would have cost $500,000 in manual labor can now be achieved for approximately $150,000–$200,000 using AI-driven migration platforms, representing a 60-70% reduction in capital expenditure. The annual 'keep-the-lights-on' (KTLO) cost for a Struts app is often 2x-3x higher than a modern Spring Boot app due to the scarcity of talent and the frequency of security patches.

Our recommendation for 2025 is a 'Phased Replacement.' Organizations should not 'keep' Struts; it is a structural constraint to Java 17+ adoption and API-first strategies. Using AI agents to document and then migrate the codebase to Spring Boot or a serverless architecture is the most cost-effective path. A full migration of a mid-sized application can now be completed in 6-12 months, compared to the 18-24 months required in the pre-AI era legacyleap.ai.