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A general description is here.
There is now a test that a JNI program can be compiled (like ‘configure’ did) and only working settings are used.
It makes use of custom settings from configuration recorded in ‘etc/javaconf’.
Configuration and ‘R CMD javareconf’ now come up with a smaller set of library paths for Java on Oracle-format JDK (including OpenJDK). This helps avoid conflicts between libraries (such as ‘libjpeg’) supplied in the JDK and system libraries. This can always be overridden if needed: see the ‘R Installation and Administration’ manual.