JNA Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function

Question

I'm learning JNI and JNA, and I'm facing the problem stated in the title while trying the examples of JNA

This is my pom and test code

<dependency>
    <groupId>net.java.dev.jna</groupId>
    <artifactId>jna</artifactId>
    <version>5.13.0</version>
</dependency>

public interface Clibrary extends Library {
    Clibrary INSTANCE = Native.load( "TestJNA", Clibrary.class);

    int hello();
    int basicTest(int a, float b, String pChar);
    void arrayTest(String pStr,  byte[] puStr);

    void pointerTest(IntByReference pInt, FloatByReference pFloat);

    void mallocTest(Memory pString);

    void doublePointTest(PointerByReference ppInt, PointerByReference ppStr);
    void freePt(Pointer pt);
}

public class Test {

    public static void main(String[] args) {
        System.setProperty("jna.library.path", "E:\\javaProject\\xxxxxxxx\\jniLearn\\src\\main\\resources\\lib");
        Clibrary.INSTANCE.hello();
    }

}

`TestJNA.dll` is written and compiled by myself.Here is the class structure, using Visual Studio 2019.The platform is x64

Here is the full stack exception.

Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'hello': The specified program could not be found.
    at com.sun.jna.Function.<init>(Function.java:252)
    at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:620)
    at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:596)
    at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:582)
    at com.sun.jna.Library$Handler.invoke(Library.java:248)
    at com.sun.proxy.$Proxy0.hello(Unknown Source)
    at org.szh.jna.Test.main(Test.java:15)

I tried to use the absolute path

Clibrary INSTANCE = Native.load("E:\\javaProject\\xxxxxxxx\\jniLearn\\src\\main\\resources\\libTestJNA",Library.class);

but the same problem still occurs.

---

this is TestJNA.cpp code.

#include "pch.h"
#include "TestJNA.h"
#include<stdio.h>
#include<string.h>
#include<stdlib.h>

/**
    No parameter test
*/
int hello()
{
    printf("Hello world\n");
    return 0;
}

/*
    Basic data type test
*/
int basicTest(int a, float b)
{
    printf("a=%d\n", a);
    printf("b=%f\n", b);
    return (int)(a + b);
}

/*
    Pointer and array tests
*/
void arrayTest(char* pStr, unsigned char* puStr)
{
    int i = 0;
    printf("%s\n", pStr);
    for (i = 0; i < 10; i++) {
        printf("%c ", puStr[i]);
    }
}

/*
    Basic data type pointer test
*/
void pointerTest(int* pInt, float* pFloat)
{
    *pInt = 10;
    *pFloat = 12.34;
}

/*
    Dynamic memory test
*/
void mallocTest(char* pszStr)
{
    strcpy_s(pszStr, 50, "Happay Children's Day!");
}

/*
    secondary pointer
*/
void doublePointTest(int** ppInt, char** ppStr)
{
    printf("before int:%d\n", **ppInt);
    **ppInt = 10086;

    *ppStr = (char*)malloc(10 * sizeof(char));
    strcpy_s(*ppStr, 50, "Happy  National Day!");
}

/*
    freed
*/
void freePoint(void* pt) {
    if (pt != NULL) {
        free(pt);
    }
}

int main()
{
    hello();
    system("pause");
    return 0;
}