some guy said the following

0.  Inspect your container logs
1.  Verify that you have the struts bean and html tag libs referenced in
your jsp and there are no other problems in the jsp
2.  Add some logging to verify that the ActionErrors constructor is
getting the actual parameters that you think it is getting
3.  Add logging to verify that the saveErrors is getting executed

and there is also snippet
if (logger.isDebugEnabled()) {
         logger.debug("building missing password hintwarning");
                }

my question is how to log.   and what should to switch the value of 
logger.isDebugEnabled() .

   thanks for your kindly help








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