Tomcat 4.1 not finding my Charset

I am trying to convert a string to EBCDIC and I use:

byte[] arr = str.getBytes("cp037");

This works when I run it stand-alone, but not when I put it in my servlet. I am using the same JVM for both environments (1.4.2). I have read about problems using ebcdic with the nio classes, but this seems to be different because it works fine stand-alone.

Does Tomcat have a mechanism to configure which charsets are available? I have looked but cannot find it.

Thanks

Roger