let's see what happened...

BusyBox v1.10.2 (Debian 3:1.10.2.legal-1osso30+0m5) built-in shell (ash)
Enter 'help' for a list of built-in commands.

~ $ java -version
java version "1.6.0_18"
OpenJDK Runtime Environment (IcedTea6 1.8) (6b18-1.8-2)
OpenJDK Zero VM (build 14.0-b16, mixed mode)
~ $ cd MyDocs/
~/MyDocs $ java -jar m.jar
Failed to load Main-Class manifest attribute from
m.jar
~/MyDocs $ java -jar mn.jar
Failed to load Main-Class manifest attribute from
mn.jar
~/MyDocs $ java -jar sp.jar
Failed to load Main-Class manifest attribute from
sp.jar
~/MyDocs $

i renamed files for quick access

any suggetion?