if ( contentType == null || "".equals(contentType) ) throw new IllegalArgumentException("Parameter contentType is not allowed to be null");
    private ContentTypeProcessor getProcessor(String contentType)    {        if ( contentType == null || "".equals(contentType) )            throw new IllegalArgumentException("Parameter contentType is not allowed to be null");                ContentTypeProcessor proc = null;        String forcedProc = registry.getConfiguration().getProperty(PROP_INPUT_PROC);        if ( forcedProc != null ) {            proc = (ContentTypeProcessor) procsByName.get(forcedProc);            if ( proc == null )                throw new IllegalArgumentException("Wrong input processor "+                                                   "specified by "+PROP_INPUT_PROC);            else                 return proc;        }                return  (ContentTypeProcessor) processors.get(contentType);        /*        if ( proc == null )             return defaultProc;        else            return proc;        */    }