mirror of https://github.com/hyperledger/besu
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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21 lines
1.2 KiB
21 lines
1.2 KiB
# Logging
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This project employs the logging utility [Apache Log4j](https://logging.apache.org/log4j/2.x/),
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accordingly levels of detail can be specified as follows:
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```
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OFF: The highest possible rank and is intended to turn off logging.
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FATAL: Designates very severe error events that will presumably lead the application to abort.
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ERROR: Designates error events that might still allow the application to continue running.
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WARN: Designates potentially harmful situations.
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INFO: Designates informational messages that highlight the progress of the application at coarse-grained level.
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DEBUG: Designates fine-grained informational events that are most useful to debug an application.
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TRACE: Designates finer-grained informational events than the DEBUG.
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ALL: All levels including custom levels.
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```
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One mechanism of globally effecting the log output of a running client is though modification the file
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`/pantheon/src/main/resources/log4j2.xml`, where it can be specified under the `<Property name="root.log.level">`.
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As such, corresponding instances of information logs throughout the codebase, e.g. `log.fatal("Fatal Message!");`,
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will be rendered to the console while the client is in use.
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