code: protected void log(final String pMessage, final Throwable pThrowable) {
          getServletContext().log(getFilterName() + ": " + pMessage, pThrowable);
      }
docs: Writes an explanatory message and a stack trace for a given
  {@code Throwable} to the servlet log file, prepended by the
  filter's name.
  
  @param pMessage the log message
  @param pThrowable the exception
  @see ServletContext#log(String,Throwable)