compiler choking on Java

I have a simple test program that compiles fine.
As soon as I add the single line:

Dstr              s               o   class(*JAVA:'java.lang.String')

The compiler complains:

      7 DStr              S               o   class
(*JAVA:'java.lang.String')
 ======>                                  a   bbbbb
 *RNF3302 20 a      000700  The Data-Type entry is not valid; defaults to
blank
 *RNF3308 20 b      000700  Keyword name is not valid; the keyword is
ignored.


Seems we aren't set up to call Java from RPG??
We do have Java set up an running on our systems and I can compile and run
Java programs.
Our sysadmin did a quick check and couldn't find any PTFs that looked like
we needed them.

Any ideas?

Thanks.
-mark

(Please note that although I've been doing Java/C/etc development for 6
years I'm an RPG newbie.
And none of the seasoned RPG guys at my shop do this type of stuff.)