If you use Jenkins, GitLab CI, or Maven to build ADF projects from the command line, you must enforce JDK 8u202 across all build agents. Use a tool like jEnv (Linux/macOS) or a Jenkins tool installer for JDK 8.
However, Elias knew the beast had a specific diet. He cracked his knuckles and opened the readme. jdeveloper 12.2.1.4 java version
Look for the line starting with SetJavaHome . If you use Jenkins, GitLab CI, or Maven
Standard Oracle JDK (OpenJDK is generally not supported for the installer) ⚠️ The Java 9+ Compatibility Gap He cracked his knuckles and opened the readme
Using the correct Java version ensures a stable, productive development experience with Oracle ADF and Fusion Middleware projects. Deviating from this will result in classloading errors, missing APIs, and unpredictable IDE behavior.
The splash screen was distinct—clean, corporate, unmistakably Oracle. It didn’t flash open instantly like a modern lightweight editor; it materialized . It was loading the heavy machinery: the ADF Business Components, the MDS (Metadata Services), and the integrated WebLogic Server instance.
Attempting to run this version of JDeveloper with Java 9 or higher (e.g., JDK 17) will typically result in a startup error stating that the maximum supported version is less than 1.9.