JNI in Mandriva Linux 2007
Hi, I tried the simple HelloWorld program in for JNI. I created the header file. And my list of files are
* HelloWorld.java
* HelloWorld.class
* Main.java
* Main.class
* HelloWorld.h
* HelloWorldImp.c
To create the header file i used the following command:
javah -jni HelloWorld
In my java i have a statement calledSystem.loadLibrary("hello"). Now i need to create the shared library hello. I have gcc. I tried the following command :
gcc -I /home/durai/jdk1.5/include/ HelloWorldImp.c -o hello.o
I got the hello.o file also. Now when i try to run the java using the following command
java -Dlibrary.java.path=/home/durai/New/testprograms/JNI/hello.o HelloWorld
it is giving the following exception:
Exception in thread"main" java.lang.UnsatisfiedLinkError: no hello in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682)
at java.lang.Runtime.loadLibrary0(Runtime.java:822)
at java.lang.System.loadLibrary(System.java:992)
at HelloWorld.<clinit>(HelloWorld.java:7)
What i have to do?. Please guide me.
[1212 byte] By [
MAYAa] at [2007-11-27 11:16:38]
# 1
> Hi, I tried the simple HelloWorld program in for JNI.
> I created the header file. And my list of files are
>
> * HelloWorld.java
> * HelloWorld.class
> * Main.java
> * Main.class
> * HelloWorld.h
> * HelloWorldImp.c
>
> To create the header file i used the following
> command:
> javah -jni HelloWorld
>
> In my java i have a statement called
> System.loadLibrary("hello"). Now i need to
> create the shared library hello. I have gcc. I tried
> the following command :
> gcc -I /home/durai/jdk1.5/include/
> HelloWorldImp.c -o hello.o
>
> I got the hello.o file also. Now when i try to run
> the java using the following command
> java
> -Dlibrary.java.path=/home/durai/New/testprograms/JNI/h
> ello.o HelloWorld
> it is giving the following exception:
>
> Exception in thread "main"
> java.lang.UnsatisfiedLinkError: no hello in
> java.library.path
> at
> java.lang.ClassLoader.loadLibrary(ClassLoader.java:168
> 2)
> at
> java.lang.Runtime.loadLibrary0(Runtime.java:822)
> at
> java.lang.System.loadLibrary(System.java:992)
> at
> HelloWorld.<clinit>(HelloWorld.java:7)
>
> What i have to do?. Please guide me.
You haven't created a shared library. You have created an object file. To create a shared library, you use the -shared option with gcc:
gcc -shared -o libhello.so -I /home/durai/jdk1.5/include/HelloWorldImp.c
Jim S.
