I tried to replace the following decalaration with the slf4j-migrator-1.6.1.jar:

private static final transient Log LOG = LogFactory
.getLog(OptimiseDTOValidator.class);

the result was

private static final transient Logger LOG = LogFactory
.getLog(OptimiseDTOValidator.class);

instead of

private static final transient Logger LOG = LoggerFactory
.getLogger(OptimiseDTOValidator.class);

the changes to the imports section are OK.