How to map levels of java.util.logging and SLF4J logger?

Question

How do logging levels from java.util.logging map to SLF4J?

SLF4J

• trace
• debug
• info
• warn
• error
• fatal

java.util.logging

• finest
• finer
• fine
• config
• info
• warning
• severe

Answer 1

From the SLF4JBridgeHandler docs and testing (annotated with brackets):

[ALL    -> TRACE]
FINEST  -> TRACE
FINER   -> DEBUG
FINE    -> DEBUG
[CONFIG -> INFO]
INFO    -> INFO
WARNING -> WARN
SEVERE  -> ERROR
[OFF    -> ERROR]