jni headers not found

[kentergav]

Running current release on MacOS. I want to get java interface but ./configure showed jni headers not found and skipped build java interface.

checking for javac... javac
checking if javac works... yes
checking if javac supports -h... yes
checking for javac... /usr/bin/javac
checking jni headers... none
configure: No JNI header directory. Disabling build of Java interface.
checking whether the linear solver loader should be used... yes
checking for dlopen in -ldl... yes

I confirmed that jni.h in the path /Users/bill/Library/Java/JavaVirtualMachines/openjdk-16.0.2/Contents/Home/include and tried to add CPPFLAGS in ./configure

./configure CPPFLAGS=-I/Users/bill/Library/Java/JavaVirtualMachines/openjdk-16.0.2/Contents/Home/include

but still get the same error and skipped java interface building

[svigerske]

I have some faint memory of problems with the Java macros on recent macOS versions because of the version number changing from 10.x to 11.y. It's probably mentioned somewhere in the autoconf-archive bugtracking system.

The line

Ipopt/configure

Line 26122 in d872b3a

macos_version=$(sw_vers -productVersion | sed -n -e 's/^[0-9]*.\([0-9]*\).[0-9]*/\1/p')

gives macos_version=0 on macOS 11.0.z, so that it goes into the wrong branch in the following if. Try hardcoding macos_version=11 at this line and see if that helps.

configure only checks here for the presence of jni.h in some locations relative to the Java installation, but doesn't use compiler search paths as you would influence with CPPFLAGS.