Always verify your jdeveloper.conf and project compiler settings to avoid cryptic build or runtime mismatches. Last verified: Q2 2025. Based on Oracle product documentation and real-world usage.
Explicitly set SetJavaHome in jdeveloper.conf to a JDK 8 path. Error 2: Compilation errors with Java 8 features (lambdas, etc.) Cause: Project compiler level is set to 1.7. jdeveloper 12.2.1.4 java version
This flexibility means you can write Java 8 code (lambdas, streams, new date API) but still generate Java 7 bytecode if needed. If you are developing ADF applications, the deployment target WebLogic Server dictates your Java version: Always verify your jdeveloper