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1. In general logging is a good idea.
2. Use Commons Logging Slf4j.
3. For debug messages, call if (log.isDebugEnabled()) prior to calling log.debug().
4. The following code is usually bad. There is no need to log exception and re-throw it:

   Code Block
   try { } catch (Exception e) { logger.error(e.getMessage(), e); throw new RuntimeException(e); }

   Either log it, or re-throw.

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