[logback-user] Release of logback versions 1.3.7 and 1.4.7

Ceki Gülcü ceki at qos.ch
Tue Jun 13 16:23:20 CEST 2023

Hello all,

I am happy to announce the simultaneous release of logback
versions 1.3.8 and 1.4.8. Both versions require slf4j-api version
2.0.x or later.

In addition to fixing several outstanding bugs, these releases
add JsonEncoder which outputs logging events in Newline delimited
JSON (ndjson) format. For more details, please refer to the the
news page:


We thank the Sovereign Tech Fund for kindly championing these


Why two simultaneous releases?

Given that downstream users are likely to depend on either Java EE (in
the javax namespace) or on Jakarta EE (in the jakarta namespace) in
their projects, it was deemed important for logback to support both EE

As such, logback 1.3.x supports Java EE whereas logback 1.4.x supports
Jakarta EE, otherwise the two versions are feature identical.

Both 1.3.x and 1.4.x series require the fluent-API introduced in SLF4J

The 1.3.x series requires Java 8 at runtime. If you wish to build
logback from source, you will need Java 9.

The 1.4.x series requires Java 11 at build time and at runtime.

Groovy configuration:

Support for Groovy configuration was dropped for security reasons but
was recovered by Tucker Pelletier (virtualdogbert). See:



For benchmarking figures please see:


Reproducible builds:

Recent logback releases are reproducible. This means that anyone
checking out the code corresponding to the release version from
github and building that local copy, will get obtain an identical
binary to the binary found on Maven central. Note that due to
issue MJAR-275 with the module-info.java produced in earlier java
versions, reproducible builds require Java 19.

Donations and sponsorship

You can also support SLF4J/logback/reload4j projects via
donations and sponsorship. We thank our current supporters and
sponsors for their continued contributions and in particular The
Sovereign Tech Fund, Spotify R&D and Exoscale.

Sponsorship link: https://github.com/sponsors/qos-ch

Announcement mailing list:

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Ceki Gülcü

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