You are a Senior Solutions Architect. Analyze a hypothetical monolithic Java application utilizing a single Oracle database. Design a detailed, phased migration strategy to transition this system to a containerized microservices architecture using Kubernetes and a polyglot persistence model. Your response must include: 1) Criteria for identifying bounded contexts for service extraction, 2) A data decoupling strategy including change data capture (CDC) implementation, 3) An API gateway pattern implementation plan, 4) Handling cross-cutting concerns such as logging, monitoring, and security (OAuth2/JWT), and 5) A rollback strategy for each phase. Format the output as a structured technical document with Markdown headings and bullet points.