Add support for Log4j API and SLF4J #177
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The logging backends supported by the default `LogFactoryImpl` have all
reached their end-of-life (except JUL and `SimpleLog`). Third-generation
logging backends, such as Log4j Core, support multiple logger contexts
per application and therefore can not be handled by the simplified
caching mechanism in `LogFactoryImpl`.
This PR introduces two new `LogFactory` implementations,
`Log4j2LogFactory` and `Slf4jLogFactory`, that forward messages to the
Log4j API and SLF4J.
During initialization the three existing factories are checked in the
following order:
1. the `Log4j2LogFactory` has highest priority, since the Log4j API can
faithfully transmit messages of type `Object`,
2. the `Slf4jLogFactory` is the next choice. However, if the
Log4j-to-SLF4J bridge is present we log directly through SLF4J
instead of the Log4j API.
3. the legacy `LogFactoryImpl` has lowest priority.
|
Could you take a look at this? |
@ppkarwasz |
|
TY @ppkarwasz ! |
garydgregory
added a commit
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Nov 3, 2023
This was referenced Mar 15, 2024
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The logging backends supported by the default
LogFactoryImplhave all reached their end-of-life (except JUL andSimpleLog). Third-generation logging backends, such as Log4j Core, support multiple logger contexts per application and therefore can not be handled by the simplified caching mechanism inLogFactoryImpl.This PR introduces two new
LogFactoryimplementations,Log4j2LogFactoryandSlf4jLogFactory, that forward messages to the Log4j API and SLF4J respectively.During initialization the three existing factories are checked in the following order:
Log4j2LogFactoryhas highest priority, since the Log4j API can faithfully transmit messages of typeObject,Slf4jLogFactoryis the next choice. However, if the Log4j-to-SLF4J bridge is present we log directly to SLF4J instead of the Log4j API.LogFactoryImplhas lowest priority.All the messages produced by loggers from
Log4j2LogFactoryandSlf4jLogFactoryare marked with aCOMMONS-LOGGINGmarker.This PR also marks the old
Log4jLoggerclass as deprecated.