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Appendix C. Logging Information and Recipes
C.1. Log Level Descriptions 复制链接链接已复制到粘贴板!
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Table C.1, “log4j Log Level Definitions” lists the typical meanings for different log levels in log4j. Your application may interpret these levels differently, depending on your choices.
log4j Level | JDK Level | Description |
---|---|---|
FATAL |
The Application Service is likely to crash.
| |
ERROR | SEVERE |
A definite problem exists.
|
WARN | WARNING |
Likely to be a problem, but may be recoverable.
|
INFO | INFO |
Low-volume detailed logging. Something of interest, but not a problem.
|
DEBUG | FINE |
Low-volume detailed logging. Information that is probably not of interest.
|
FINER |
Medium-volume detailed logging.
| |
TRACE | FINEST |
High-volume detailed logging.
|
Note
The more verbose logging levels are not appropriate for production systems, because of the high level of output they generate.
Example C.1. Restricting Logged Information to a Specific Log Level