hey @aleksandrvin, can you post here your .java file?
Im trying to do the same with the java file but Im getting this error:
ERROR! Java file `./app/libs/fileOutputStream.java' extends a class that was not discovered by the compiler
I tried to change the java file name to "file_output_stream" too, event with just the method declaration, I got the same error.
Do I need to create a class or something before the public void?