Any Java logger has structured logging. The prevailing solution is SLF4J, which is a facade that can be implemented by any number of backends, e.g. Logback. T

Any Java logger has structured logging. The prevailing solution is SLF4J, which is a facade that can be implemented by any number of backends, e.g. Logback. There is logging in the stdlib (java.util.logging), but it's the less common choice, for whatever reason.