Fatal Error Warn Info Debug
Contents |
All Implemented Interfaces: Serializable Direct Known
Log Level Hierarchy
Subclasses: UtilLoggingLevel public class Levelextends Priorityimplements Serializable log4j debug levels Defines the minimum set of levels recognized by the system,
Log Level Trace Vs Debug
that is OFF, FATAL, ERROR, WARN, INFODEBUG and ALL. The Level class may be subclassed to debug level samsung define a larger level set. Author: Ceki Gülcü See Also:Serialized Form Field Summary staticLevel ALL The ALL has the lowest possible rank and is intended to turn on log4j2 log levels all logging. staticLevel DEBUG The DEBUG Level designates fine-grained informational events that are most useful to debug an application. staticLevel ERROR The ERROR level designates error events that might still allow the application to continue running. staticLevel FATAL The FATAL level designates very severe error events that will presumably lead the application to abort. staticLevel INFO The INFO level designates informational messages that highlight the progress of the application at coarse-grained level. staticLevel O
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this
Logging Levels Java
site About Us Learn more about Stack Overflow the company Business Learn more slf4j log levels about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x
Syslog Logging Levels
Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up When to https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html use the different log levels? up vote 142 down vote favorite 107 There are different ways to log messages, in order of fatality: FATAL ERROR WARN INFO DEBUG TRACE How to decide when to use which? What's a good heuristic to use? logging coding-style share|improve this question edited Apr 22 at 7:48 Tushar Makkar 335521 asked Jan 8 '10 at 22:19 raoulsson 4,00963152 add http://stackoverflow.com/questions/2031163/when-to-use-the-different-log-levels a comment| 16 Answers 16 active oldest votes up vote 217 down vote accepted I generally subscribe to the following convention: Trace - Only when I would be "tracing" the code and trying to find one part of a function specifically. Debug - Information that is diagnostically helpful to people more than just developers (IT, sysadmins, etc.). Info - Generally useful information to log (service start/stop, configuration assumptions, etc). Info I want to always have available but usually don't care about under normal circumstances. This is my out-of-the-box config level. Warn - Anything that can potentially cause application oddities, but for which I am automatically recovering. (Such as switching from a primary to backup server, retrying an operation, missing secondary data, etc.) Error - Any error which is fatal to the operation, but not the service or application (can't open a required file, missing data, etc.). These errors will force user (administrator, or direct user) intervention. These are usually reserved (in my apps) for incorrect connection strings, missing services, etc. Fatal - Any error that is forcing a shutdown of the service or application to prevent data loss (or
FATAL are defined http://www.allapplabs.com/log4j/log4j_levels.htm in the org.apache.log4j.Level class. If a given logger is not assigned http://blog.yeradis.com/2013/10/all-trace-debug-info-warn-error-fatal.html a level, then it inherits one from its closest ancestor with an assigned level. The root logger resides at the top of the logger hierarchy. It always exists and always has an assigned level. The logger is the core component of log level the logging process. In log4j, there are 5 normal levels Levels of logger available (not including custom Levels), the following is borrowed from the log4j API (http://jakarta.apache.org/log4j/docs/api/index.html): static Level DEBUG - The DEBUG Level designates fine-grained informational events that are most useful to debug an application. static Level INFO - The INFO level fatal error warn designates informational messages that highlight the progress of the application at coarse-grained level. static Level WARN - The WARN level designates potentially harmful situations. static Level ERROR - The ERROR level designates error events that might still allow the application to continue running. static Level FATAL - The FATAL level designates very severe error events that will presumably lead the application to abort. In addition, there are two special levels of logging available: (descriptions borrowed from the log4j API http://jakarta.apache.org/log4j/docs/api/index.html): static Level ALL -The ALL Level has the lowest possible rank and is intended to turn on all logging. static Level OFF - The OFF Level has the highest possible rank and is intended to turn off logging. Log4j Log4j Features Log4j Loggers Log4j Appenders Log4j Layouts Log4j Levels Log4j Installation Log4j vs. JSR47 Pros & Cons of Log4j Use of this website constitutes acceptance of the AllAppLabs.com Terms and Conditions AllAppLabs.com
> OFF or how works Log4j levels in our shitty application Dealing with Log4j will push us inevitably (but in a good way) to work with Appenders and Levels.When that moment arrives, and we configure our log4j.properties to just INFO messages. We will discover there are other type of messages.And thats because of Levels! There is a hierarchy!Works in this way: TRACE: Shows messages classified as DEBUG, INFO, WARNING,ERROR and FATAL DEBUG: Shows messages classified as DEBUG, INFO, WARNING, ERROR, and FATAL INFO: Shows messages classified as INFO, WARNING, ERROR, and FATAL WARNING: Shows messages classified as WARNING, ERROR, and FATAL ERROR: Shows messages classified as ERROR and FATAL FATAL: shows messages at a FATAL level onlyALL: You are a genius! Turn on all logging. OFF: Yes you are! Turn off all logging. Let's put this into a drawing: And that's all folks. Newer Post Older Post Home Blog Archive June (1) May (1) April (1) August (1) July (1) December (1) October (1) September (3) August (3) July (1) December (1) November (1) October (4) September (1) August (1) June (1) May (5) April (3) December (1) November (7) October (2) September (1) June (1) May (3) October (1) August (3) May (1) April (1) March (3) February (4) January (1) December (1) November (2) January (2) May (1)