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There's also a page containing the history, particularly the saga of how we moved forward to Java 1.6 and Java 8 across a series of platform-related changes.
This section describes the (notional) plans for JMRI releases in the future.
|4.0||Production version, culmination of 3.11.* series||July 2015 (done)||8||8|
|4.2||Production version, culmination of 4.1.* series||December 2015 (done)||8||8|
|4.4||Production version, culmination of 4.3.* series||Early Summer 2016||8||8|
|4.6||Production version, culmination of 4.5.* series||Late Fall 2016||8||8|
|4.8||Production version, culmination of 4.7.* series||Early Summer 2017||8||8|
|4.10||Production version, culmination of 4.9.* series||December 2017||8||8|
|4.12||Production version, culmination of 4.11.* series||July 2018||8||8|
|4.14||Production version, culmination of 4.13.* series||December 2018||8||8|
|4.16||Production version, culmination of 4.15.* series||July 2019||8||8|
|4.18||Production version, culmination of Fall 2019 series||December 2019||8||8|
|4.20||Production version, culmination of Spring 2020 series||July 2020||8||8|
|4.22||Production version, culmination of Fall 2020 series||February 2021||8||8|
|(Probably) 5.0||Production version, culmination of Spring 2021 series||June 2021||11||11|
The current long-term-support Java release is Java 11 from Fall of 2018. Oracle has aligned their Java and the OpenJDK from that point. Because some people will need to have that on their computers for other purposes, we ensure JMRI can build and run on Oracle Java 8 through 11 and OpenJDK version 11 by using Jenkins to
At some point, the Java version required by JMRI has to move forward. For example, Oracle has announced that they'll stop providing standalone JRE installers by the end of 2020, by which time JMRI distributions will have to contain the Java runtime components or it won't be possible to run JMRI on newly-bought PCs (will continue to provide independent JREs). That in turn might require tools like jlink from Java 9 or later.
While we don't know with certainty when JMRI development will move past Java 8, we expect that it will be during the Spring 2021 development releases, leading to the June 2021 production releases requiring Java 11 and therefore being called JMRI 5.0. There might be one or two JMRI updates and minor releases early in Spring that would still work with Java 8.
This is a section of notes for various code migrations that are in progress or contemplated. These don't directly affect JMRI users in the way that Java version changes do, but they may effect external users of the JMRI libraries.