code: public String createTokenString(String builderConfigId) {
  		try {
  			return createTokenString(builderConfigId, WSSubject.getRunAsSubject(), null, null);
  
  			// JwtBuilder builder = JwtBuilder.create(builderConfigId);
  			//
  			// // all the "normal" stuff like issuer, aud, etc. is handled
  			// // by the builder, we only need to add the mp-jwt things
  			// // that the builder is not already aware of.
  			// String user = getUserName();
  			// builder.subject(user);
  			// builder.claim(USER_CLAIM, user);
  			//
  			// ArrayList<String> groups = getGroups();
  			// if (isValidList(groups)) {
  			// builder.claim(GROUP_CLAIM, groups);
  			// }
  			//
  			// return builder.buildJwt().compact();
  
  		} catch (Exception e) {
  			// ffdc
  			return null;
  		}
  
  	}
docs: create an MP-JWT token using the builder API. Assumes the user is already
  authenticated.
  
  @param builderConfigId
  - the id of the builder element in server.xml
  @return the token string, or null if a mandatory param was null or empty.