jni.h: No such file or directory

Question

I have been following this tutorial, and at step 5, I am getting the following output from GCC:

    HelloWorld.c:1:17: error: jni.h: No such file or directory     In file included from HelloWorld.c:3:     HelloWorld.h:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’     HelloWorld.c:5: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’ 

I know that he include directories vary from system to system, so I tried to adapt the command accordingly, but I cannot seem to find the correct directory on my system. I am using Ubuntu 10.04LTS.

Answer 1

Open up a terminal and type:

locate jni.h 

That should tell you where every file called jni.h is on your system. I am on ubuntu 11.04, and it's located at:

/usr/lib/jvm/java-6-openjdk/include/jni.h /usr/lib/jvm/java-6-sun-1.6.0.26/include/jni.h 

You may also need to get it from the repos:

sudo apt-get install openjdk-6-jdk  

should do the trick if you don't have it installed.

Answer 2

jni.h lives with JDK. For me it is: jdk1.6.0_25/include/.

And by default, I don't think Ubuntu would have JDK with development libraries, so download latest JDK version from Oracle and install it somewhere.

Or you can install openjdk as @Leif suggested if it works on 10.04 LTS. Although, I personally, prefer the one from Sun/Oracle.