Release Notes for JMRI 4.20 release

Date: July 8, 2020

From: Bob Jacobsen

Subject: Production Release 4.20 of JMRI/DecoderPro is available for download.

We are very pleased to announce that the 4.19 series of JMRI test releases has resulted in a version that's good enough to be recommended for general use, including by new users. We're therefore making that version, "Production Release 4.20" available for download today.

Notes:

JMRI is now only available under the GNU General Public License. For more information, please see our copyright and licensing page.

Update From Older JMRI Versions

If you are currently using a version older than JMRI 4.18, please follow these instructions carefully:
  1. Is your current version older than JMRI 4.12? If so, then update to JMRI 4.12 first, and ensure everything works correctly: check start-up, check things you need to be working, and check the JMRI log as well. Once all is well, store your configuration and panel files under a new name and use those from now on. Continue with step 2.

    If you are currently using JMRI 4.7.3 or earlier on Linux or macOS (Windows doesn't need this), then it's very important that you update to JMRI 4.12 and carrying out the migration process described in the JMRI 4.12 release note before updating to any later relese.

  2. Is your current version older than JMRI 4.18? Then update to JMRI 4.18 first, and ensure that works correctly: check start-up, check things you need to be working, and check the JMRI log as well. Once all is well, store your configuration and panel files under a new name and use those from now on.
  3. You can then install this release.
Following this multi-step order of updating via stable major releases safeguards you against possible migration issues that can arise from skipping these versions.

Known problems with this release

New warnings for this production release:

Older warnings

See the JMRI 4.16 release note for more warnings predating the 4.17 development series. These may be relevant to you if you're updating from an earlier version.

Download links:

Please note that the download links in this and future JMRI releases link to Github servers. People are welcome to distribute the download files further via other websites, etc. If you want to check that you've received original, unmodified versions, please check the files against the checksums shown below.

Changes since production release 4.18:

This production version is made from test releases 4.19.1 through 4.19.9. The full list of changes in those is available from our code repository.

Hardware Support

LocoNet

MERG CBUS

SPROG

New / Updated decoder definitions

BLI

ESU

Hornby

Public Domain and DIY decoders

SoundTraxx

Control Panel Editor

Dispatcher

Internationalization

Layout Editor

NX - Entry/Exit Tool

Logix

Operations

Panel Editors

Resources

Roster

Routes

Scripting

Signals

Cab Signals

Signal Masts

Signal Systems

Throttle

Turnouts, Lights, Sensors and other elements

Warrants

Web Access

Where Used

Virtual Sound Decoder

Miscellaneous