PL/Java brings functions, triggers, and types in Java. The 1.5 series supports legacy applications, with PostgreSQL support extending from 13 back to 8.2, and Java from 14 back to 8 (7 or 6 with some extra build effort).
1.5.7 is a pure bugfix release correcting one bug in XML Schema handling for some non-en_US locales. Its features are otherwise identical to 1.5.6.
For applications on PostgreSQL 9.5 or later and Java 9 or later, please consider the PL/Java 1.6 series.
Project site: http://tada.github.io/pljava/
Release notes: http://tada.github.io/pljava/releasenotes.html
Availability:
1.5.7 is available from GitHub as a source release, which builds quickly using Maven:
Release page: https://github.com/tada/pljava/releases/tag/V1_5_7
This wiki page will add links to prebuilt packages that become available:
https://github.com/tada/pljava/wiki/Prebuilt-packages