racarr@gorbie:/tmp/bla$ cat << EOF > reallynow.java
> class Roffles
> {
> public static void main(String[] args)
> {
> int a;
> System.out.println(a);
> }
> }
> EOF
racarr@gorbie:/tmp/bla$ javac reallynow.java 
----------
1. ERROR in reallynow.java (at line 6)
        System.out.println(a);
                           ^
The local variable a may not have been initialized
----------
1 problem (1 error)