I suppose to add a java compiler to moodel i wont to know is that already available or can I start my work on that project
One user, different accounts... or are you all working on the same project?
https://moodle.org/mod/forum/discuss.php?d=267862
https://moodle.org/mod/forum/discuss.php?d=267890
https://moodle.org/mod/forum/discuss.php?d=267899
If you want to know if there is one available, you may search for a java compiler at the plugins page: