Migrate Oracle-to-PostgreSQL Java code with AWS Transform custom

This article demonstrates how to use AWS Transform custom with a pre-built transformation definition to automate Oracle-to-PostgreSQL migration for Java applications, addressing not just SQL syntax but also JDBC types, ORM configuration, and test infrastructure.

• 71 transformation rules cover DDL type conversions, SQL syntax, JDBC return-type handling, parameter binding, ORM configuration, and build dependencies
• Publish the transformation definition to your AWS account registry once, then execute against multiple Java repositories from the CLI
• Handles 60%+ of real migration work beyond SQL: JDBC type handling, entity field types, test assertions, and transaction semantics
• Includes guardrails to prevent security issues like plaintext credentials in source code or loss of TLS settings
• Supports build verification with compilation checks and generates staging branches for review before merging
• Open-source transformation definition available in aws-samples/sample-oracle-to-postgresql-td GitHub repository

AWS Transform custom enables faster, more consistent Oracle-to-PostgreSQL migrations at scale by automating application-layer changes across hundreds of files without requiring database connectivity.