Can anyone tell me where I got wrong in my jni conde?

Question

I am new to jni.
I want to pass a class from java to C, and after some data value inserting, this class will be returned to Java.
But the exception occured: java.lang.UnsatisfiedLinkError.
I can't see where the error is.
So anyone can give me any suggestions??
I'll paste my test code as follows:
TestSCJNI.java
import java.lang.*;
public class TestSCJNI {
          static {
          System.loadLibrary("TestSCJNI");
     private native ServiceComp test_queryServiceComp(ServiceComp _sc);
     ServiceComp sc;
     public TestSCJNI(){
          sc = new ServiceComp();
     public static void main(String[] args) {
          TestSCJNI t = new TestSCJNI();
          t.sc = t.test_queryServiceComp(t.sc);
          System.out.println("tsId" + t.sc.tsId + "NwID" + t.sc.orginNwId);
     class ServiceComp {
          char tsId;
          char orginNwId;
          char svId;
}TestSCJNI.c
#include <stdio.h>
#include <stdlib.h>
#include <jni.h>
#include "TestSCJNI.h"
JNIEXPORT jclass JNICALL Java_TestSCJNI_test_queryServiceComp(JNIEnv *env, jobject obj, jobject sc) {
     jclass t = (*env)->GetObjectClass(env,sc);
     (*env)->SetCharField(env,t,"tsId",12);
     (*env)->SetCharField(env,t,"orginNwId",0);
     (*env)->SetCharField(env,t,"svId",3);
     //t.orginNwId = 0;
     //t.svId = 3;
     return t;
} Thanks for any help!

Answer 1

yes. The procedure I run the program are :
1. javac *.java
javah -jni TestSCJNI
2. gcc -c TestSCJNI.c
3. gcc �shared -o libTestSCJNI.so TestSCJNI.o
4. java -Djava.library.path=. TestSCJNI
I supposed that the procedure is right...
Or something incorrect in the procedure??This is just a wild guess, but what happens if you replace step
2) and 3) by one new step? like this:
gcc TestSCJNI.c -o libTestSCJNI.so -shared -I<include stuff here>
I suspect that gcc generates position dependent code if it just has
to compile a compilation unit. The -shared flag implies the -fPIC
flag for compilation if I'm not mistaken ...
kind regards,
Jos