Release Notes for JMRI 4.5.1 release

Date: July 10, 2016

From: Bob Jacobsen

Subject: Test version 4.5.1 of JMRI/DecoderPro is available for download.


This is a test release. Please post a note if you encounter any new or old bugs! And please back up your JMRI files before installing this, in case you want to go back to an earlier version.

This is the next in a series of test versions. We expect this series to end in the next JMRI production release around the end of 2016. (See the tentative release schedule)

Some of the changes involved are quite extensive. They may require a certain amount of experience before they are working well. Therefore, this test version should be considered experimental.

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

Known problems with this release

If any of those effect you, please either wait for JMRI 4.5.2, due out shortly after this one, or pick up a development build installer from Jenkins.

New warnings for this version:

Older warnings

See the JMRI 4.4 release note for warnings predating the 4.4 development series. These may be relevant to you if you're updating from an earlier version.

(Since JMRI 4.3.5) When sharing a configuration between this version and JMRI 4.3.4 or older, the older version of JMRI will not reflect changes in preferences, window position, table sorting, column order, or other user interface state. This is due to changes in how user preferences and interface state are stored.

(Since JMRI 4.3.3) You can now set the order of your startup items: If you're opening panel files, running scripts, etc as the program starts up, there's a preferences pane that lets you easily set the order in which those happen. If you've set the order manually (e.g. by editing configuration files) in the past, please check this preference to make sure it's set the way you want.

(Since JMRI 4.1.2) Jython has been upgraded to version 2.7.0 with the following potentially breaking changes:

(Since JMRI 4.1.1) Decoder definitions that use the "ivariable" form are now deprecated. Definitions included with this release have been converted to the new form. If you have decoder definitions with the older "ivariable" form, they will no longer validate, but can still be used for the first couple of test releases in this series. Please ask on the JMRI users Yahoo group for help converting them, or just drop them and use the current definitions.

(Since JMRI 4.1.1) The OpenLCB 0.6.4 library in this version has a bug in its alias calculations which prevents JMRI from communicating occasionally. A patch has been submitted to the OpenLCB group, but as they seem no longer interested in maintaining that code, it's not known when this will be fixed. In the meantime, the workaround is to restart JMRI and/or the hardware node(s) and try again; that might allocate different alias values.

Download links:

Please use these links for downloading:

Mac OS X:
sha256: 3d4375a8ac8a146e5b218d5d54fe4ab7dcd6a613c60cf3ceded9003b028f095f

sha256: e80ecbeef9533e26260ae88934d187beb8cd43bb6c6c43c8cf2f18ad2a79e27a

sha256: 0aa4207d77054ba50dbf3be3c2f9b26392bdeafb045df1e715105f00766c3d4e

Changes since production release 4.4:

The list of included commits is available from our GitHub code repository.

Hardware Support


New / Updated decoder definitions





Signal Systems
Signal Mast Drivers

Web Access