code: public void reinit(final String id,
                       final Object caller,
                       final MessageResources messages,
                       final ActionMessages msgs,
                       final String exceptionPname,
                       final boolean clear) {
      super.reinit(id, caller, messages, null, exceptionPname, clear);
      this.msgs = msgs;
    }
docs: Generation of errors in the servlet world means adding them to the
  errors object. We need to call this routine on every entry to the
  application
  
  @param id       An identifying name
  @param caller   Used for log identification
  @param messages Resources
  @param msgs     Error message will be appended on failure.
  @param exceptionPname Property name for exceptions
  @param clear clear list if true