During compilation, all language files mention this:
[INFO] Processing de.po
[WARNING] msgfmt --java2 -d /home/coderial/libreplan/ganttzk/target/classes -r app.i18n.Messages -l de /home/coderial/libreplan/ganttzk/src/main/java/../resources/i18n/de.po
[WARNING] warning: [options] bootstrap class path not set in conjunction with -source 6
[WARNING] warning: [options] source value 6 is obsolete and will be removed in a future release
[WARNING] warning: [options] target value 1.6 is obsolete and will be removed in a future release
[WARNING] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options.
[WARNING] Note: /tmp/msg3Zs0ke/app/i18n/Messages_de.java uses unchecked or unsafe operations.
[WARNING] Note: Recompile with -Xlint:unchecked for details.
[WARNING] 4 warnings
During compilation, all language files mention this:
[INFO] Processing de.po [WARNING] msgfmt --java2 -d /home/coderial/libreplan/ganttzk/target/classes -r app.i18n.Messages -l de /home/coderial/libreplan/ganttzk/src/main/java/../resources/i18n/de.po [WARNING] warning: [options] bootstrap class path not set in conjunction with -source 6 [WARNING] warning: [options] source value 6 is obsolete and will be removed in a future release [WARNING] warning: [options] target value 1.6 is obsolete and will be removed in a future release [WARNING] warning: [options] To suppress warnings about obsolete options, use -Xlint:-options. [WARNING] Note: /tmp/msg3Zs0ke/app/i18n/Messages_de.java uses unchecked or unsafe operations. [WARNING] Note: Recompile with -Xlint:unchecked for details. [WARNING] 4 warnings
Research and fix.