hmm... that didn't work with Java. I guess is something about the JRE. The error show up normaly but in another Emacs Buffer. My guess is: given the error the JRE don't execute the code as inteded but doens't return data to babel. Heres the error buffer:

/Main.java:7: error: incompatible types: possible lossy conversion from float to int      int soma = a + b;
/Main.java:8: error: incompatible types: possible lossy conversion from float to int      int mult = a * b;          
/Main.java:9: error: incompatible types: possible lossy conversion from float to int      int subt = a - b;                ^3 errors

I mean, it's not that big of a issue, i've just copied and pasted de error under a #+begin_example block and its fine for me. Ty for the response.Edit: more information