SLF4J usage issues

I found the following logging issues:

1. toString() invocation

   logger.trace("in ANON: value from data object: *** {} ***", data.toString());
   

2. string concatenation

   logger.trace("text value is: " + text);
   

3. hard work in logging without level check

   if (logger.isInfoEnabled()) {
       // hard work
   }