10 commandments of logging - code extracts

MDC.java

  class UserRequest {
    ...
    public void execute(int userid) {
      MDC.put("user", userid);
      ... all logged message now will display the user=<userid> for this thread context ...
      
      // user request processing is now finished, no need to log our current user
      MDC.remote("user");
    }
  }

Ranking.java

public void storeUserRank(int userId, int rank, String game) {
  try {
    //... deal database ...
  } catch(DatabaseException de) {
    throw new RankingException("Can't store ranking for user "+userId+" in game "+ game + " because " + de.getMessage() );
  }
}