JNI on UNIX help

[Sri Harsha Yenuganti]

I am trying to use JNI calls to C library in UNIX environment. I tried to run a simple hello world application using

java -Djava.library.path=. com.code.jni.Hello

I have the "libHello_JNI.so" library in the current directory. But why is it still complaining

Exception in thread "Main Thread" java.lang.UnsatisfiedLinkError: no Hello_JNI in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1682)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1030)
at com.fedex.jni.Hello.<clinit>(Hello.java:6)

I have tried setting the LD_LIBRARY_PATH to the directory containing "libHello_JNI.so". Even that did not work !!
Can anyone help me ?

[Karthik Shiraly]

Looks like library name passed to System.load() is wrong, doesn't it? Filename is "libHello_JNI" but exception says "Hello_JNI"...

[Rob Spoor]

Karthik Shiraly wrote:Looks like library name passed to System.load() is wrong, doesn't it? Filename is "libHello_JNI" but exception says "Hello_JNI"...

With loadLibrary, you don't add the ".dll" in Windows or the starting "lib" and ending ".so" in Linux.

[Ernest Friedman-Hill]

Maybe libHello_JNI.so is not a valid shared library file. Maybe it's 64bit, and the JVM is 32-bit, or vice-versa? Maybe it's a "*.a" library, but you've named it as *.so?

[Sri Harsha Yenuganti]

I have a source file Hello.cpp. The processor architecture is x86-64. I am generating the shared library using the following command :

gcc -shared -m64 -I/path/to/include/files -fPIC Hello.cpp -o libHello_JNI.so

This library is in the folder specified on the path. Even then I am getting the error !

Can you tell me where I am going wrong ?

Thank You.