Java 1.4
By default, OpenXava comes compiled with Java 5, you can recompile it with Java 1.4 following the next steps inside Eclipse:
- Windows > Preferences > Java > Installed JREs : Choose a Java 1.4
- OpenXava > Properties > Java Compiler > Compiler compliance level: Choose 1.4
- OpenXava > Properties > Java Builde Path > Source > Remove java5-src folder
- Build all (Ctrl -B)
Obviously if you want to use POJOs + JPA + Java 5 annotations you must use Java 5. Java 1.4 only works for classic XML components.