Where can I find the jni headers for Mac OS

Question

I'm not asking where I can find it on my own computer, I'm asking where I can get it.

I've done my google homework, and I didn't find the headers in those paths. There wasn't even a Header folder in my /System/Library/Java/JavaVirtualMachines/... and stuff and I don't have a Developer folder under root.

Now I'm pretty sure I don't have those headers installed, I checked the MacOS developer website but I only found some broken links.

Shouldn't OpenJDK or SunJDK provide the jni.h header for MacOS somewhere?

Answer 1

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/System/Library/Frameworks/JavaVM.framework/Versions/A/Headers/jni.h

But this depends on your environment.

Answer 2

You can use the java_home command to find the correct location. See the Oracle docs.

So for example in your makefile you could have:

JAVA_HOME:=`/usr/libexec/java_home`
CPPFLAGS:=-I $(JAVA_HOME)/include -I $(JAVA_HOME)/include/darwin

Note that you also need to add $(JAVA_HOME)/include/darwin to the include path so it can find jni_md.h which is the machine-specific part and is included by jni.h

Answer 3

1. jdk8 download web url: http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

download it and install.

2. check java version:

sodino:~ sodino$ java -version 
java version "1.8.0_45" 
Java(TM) SE Runtime Environment (build 1.8.0_45-b14) 
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

3.find 'java' original path and ‘java_home':

sodino:~ sodino$ which java
/usr/bin/java
sodino:~ sodino$ ls -n /usr/bin/java
lrwxr-xr-x  1 0  0  74 Sep 30  2014 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
sodino:~ sodino$/System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java_home
/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home

4. get ‘include’ folder and jni.h

   now you will find a ‘include’ folder with in ‘/Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home’, and open it ‘jni.h’ will be found.