The issue was a missing column in the ROUTE_OVERRIDE table. Maya opened the Database Navigator (View → Database → Database Navigator). She connected to the new 23c database, compared the old schema (from a backup dump) with the new one, and found the problem: TIMESTAMP type mismatch.
Maya later told her junior devs: "JDeveloper 14c isn't just for ADF. It's a reverse-engineering, refactoring, and rescue toolkit. When the legacy code is on fire, don't fight it—let the IDE map the way out." Key Takeaway: JDeveloper 14c shines in integrating old Java projects with new Oracle databases, visual debugging, and automated refactoring—turning potential project failures into quiet victories. jdeveloper 14c
At 3 AM, she right-clicked the application → Deploy → to WAR . JDeveloper generated a clean deployment descriptor, resolved library conflicts (JAXB versions), and packaged everything. She uploaded the WAR to the test server. The issue was a missing column in the ROUTE_OVERRIDE table