public void error(Object message, Throwable t) {
        logger.error(String.valueOf(message), t);
    }
Converts the first input parameter to String and then delegates to the
wrapped <code>org.slf4j.Logger</code> instance.

@param message
         the message to log. Converted to {@link String}
@param t
         the exception to log
jcl-over-slf4j/src/main/java/org/apache/commons/logging/impl/SLF4JLog.java