The compiler compliance level corresponds to the Java version used for Job code generation.
For more information on the compiler compliance levels compatibility, see Talend Installation Guide.
Click on the toolbar of the Studio main window, or click File > Edit Project Properties from the menu bar to open the [Project Settings] dialog box.
Expand the Build node and click Java Version.
From the JDK Compiler compliance level list, select the compiler compliance level you want to use, and then click OK.