There is no real difference between JNI on Linux and JNI on other
operating
systems (and not suppose to be). Look at Sun Java tutorial on JNI:
http://java.sun.com/docs/books/tutorial/native1.1/index.html
Take the source code for HelloWorld example and follow the instructions:
after the first step the directory listing will be:
step 1: Writing HelloWorld.java file
my_directory>ls -l
HelloWorld.java
step 2: Java compilation
javac HelloWorld.java
my_directory>ls -l
HelloWorld.java
HelloWorld.class
step 3: Generating HelloWorld.h file (Don't use .java extension)
javah -jni HelloWorld
my_directory>ls -l
HelloWorld.java
HelloWorld.class
HelloWorld.h
step 4: Writing HelloWorldImp.c file
my_directory>ls -l
HelloWorld.java
HelloWorld.class
HelloWorld.h
HelloWorldImp.c
step 5a: Compilation of C file
gcc -I//homes/nikom/work/Java/jdk1.2/include \
-I//homes/nikom/work/Java/jdk1.2/include/linux \
-c HelloWorldImp.c \
-o HelloWorldImp.o
Notice, you need to provide path to C include directory.
It is not obvious thing to do.
my_directory>ls -l
HelloWorld.java
HelloWorld.class
HelloWorld.h
HelloWorldImp.c
HelloWorldImp.o
step 5b: creating the shared library
gcc -shared HelloWorldImp.o -o libhello.so
my_directory>ls -l
HelloWorld.java
HelloWorld.class
HelloWorld.h
HelloWorldImp.c
HelloWorldImp.o
libhello.so
step 6: Run the Program
java HelloWorld
Hello world!
Good luck,
Jacob Nikom
Justin Lawler wrote:
>
> Hi all,
>
> is there anywhere i can get information/documentation on using JNI on linux.
> I know you use the javah tool to create a header file for your c program, but
> where do you go from there.
>
> any help much appreciated,
>
> Justin.
>
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