我该如何解决“不满意的链接错误”？ JNI [英] How Can I Resolve "Unsatisfied Linkerror" Jni

问题描述

嗨

我得到一个异常不满意的错误即



线程main中的异常java.lang.UnsatisfiedLinkError： test.HelloWorld.print（）V

at test.HelloWorld.print（Native Method）

at test.HelloWorld.main（HelloWorld.java:24）



我使用Netbeans7.1和Eclipse链接Java和C ++



请参阅下面的代码..



Java部分

*************

  package  test; 
  public   class  HelloWorld 
 {
  static  
 {
  //   System.load（C ：\\\\\\\\\ HelloHorld \\Debug \\libHelloWorld.dll）;  
 System.loadLibrary（  libHelloWorld）; 
} 
 私有  native   void  print（）; 
 
  / *   * 
 * @param args命令行参数
 * /  
  public   static   void  main（ String  [] args）
 {
  //  这里的TODO代码应用程序逻辑 
 
  new  HelloWorld（）。print（ ）; 
 
} 
} 

C ++ - ECLIPSE

** *********



hello_jni.h

************ ****

  / *  请勿编辑此内容文件 - 由机器生成* /  
  #include   <   jni.h  >  
  < span class =code-comment> / *  类helloworld_HelloWorld的标题* /  
 
  #ifndef _Included_test_HelloWorld 
  ＃define _Included_test_HelloWorld 
   #ifdef __cplusplus 
   extern    C {
 ＃endif 
   / *   
 *类：helloworld_HelloWorld 
 *方法：打印
 *签名:(）V 
 * /  
 JNIEXPORT  void  JNICALL Java_test_HelloWorld_print（JNIEnv *，jobject）; 
 
  #ifdef __cplusplus 
 } 
 ＃endif 
  ＃endif  

hello_jni.cpp

******************

 include   hello_jni.h 
 使用 命名空间标准; 
  / *   
 *类：hello_jni.cpp 
 *方法：print 
 *签名:(）V 
 * /  
 
 JNIEXPORT  void  JNICALL Java_test_HelloWorld_print（JNIEnv * env，jobject jobj）
 {
 std :: cout<<   Iside C ++ native method HELLOOOOOOOOOOOOOOOOOO< /跨度>; 
  return ; 
} 

请帮助

提前致谢。

解决方案

我有一段时间没有触及JNI，但我相信你的C ++库是静态链接到jni.dll的。程序运行时，它无法加载您的DLL，因为系统无法在默认搜索路径中找到jni.dll，因此无法加载您的DLL。所以检查一下。

我怀疑你没有 java.library.path 的默认路径，所以java找不到DLL。我刚刚构建了你的项目，将DLL复制到与类文件相同的目录中......

 C：\ Users \ Richard \Documents \\目录\\ Java \ jni2 \ test 
 
 27/02/2015 14:45< dir> 。 
 27/02/2015 14:45< dir> .. 
 27/02/2015 14:28 463 HelloWorld.class 
 27/02/2015 14:27 481 HelloWorld.java 
 27/02/2015 14:44 37,376 libHelloWorld.dll 
 3档案38,320字节
 2 Dir（s）123,847,589,888字节免费
< / dir>< / dir> 

...并键入命令...

 java -Djava.library.path = C：\ Users \ Richard \Documents \ Java \ jni2\test test / HelloWorld 

收到结果

 Iside C ++原生方法HELLOOOOOOOOOOOOOOOOOOOO 

Hi
Iam getting an Exception "UnsatisfiedLinakge error" ie,

Exception in thread "main" java.lang.UnsatisfiedLinkError: test.HelloWorld.print()V
at test.HelloWorld.print(Native Method)
at test.HelloWorld.main(HelloWorld.java:24)

Iam using Netbeans7.1 and Eclipse to link Java and C++

Please see the below code..

Java Part
*************

package test;
public class HelloWorld
{    
    static
    {
       // System.load("C:\\eclipse\\ws\\HelloWorld\\Debug\\libHelloWorld.dll");
        System.loadLibrary("libHelloWorld");
    }
    private native void print();

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        // TODO code application logic here
          
       new HelloWorld().print();
                       
    }
}

C++ - ECLIPSE
***********

"hello_jni.h"
****************

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class helloworld_HelloWorld */

#ifndef _Included_test_HelloWorld
#define _Included_test_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     helloworld_HelloWorld
 * Method:    print
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_test_HelloWorld_print(JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

"hello_jni.cpp"
******************

include "hello_jni.h"
using namespace std;
/*
 * Class:     hello_jni.cpp
 * Method:    print
 * Signature: ()V
 */

JNIEXPORT void JNICALL Java_test_HelloWorld_print(JNIEnv * env, jobject jobj)
{
	std::cout<<"Iside C++ native method HELLOOOOOOOOOOOOOOOOOOO";
	return;
}

Please Help
Thanks in advance.

解决方案

I haven't touched JNI for a while, but I believe your C++ library is statically linked to jni.dll. When your program is running it cannot load your DLL because the system cannot find jni.dll in the default search path and as a result your DLL cannot be loaded. So check that.

I suspect that you do not have a default path for java.library.path so java cannot locate the DLL. I just built your project, copied the DLL to the same directory as the class file ...

 Directory of C:\Users\Richard\Documents\Java\jni2\test

27/02/2015  14:45    <dir>          .
27/02/2015  14:45    <dir>          ..
27/02/2015  14:28               463 HelloWorld.class
27/02/2015  14:27               481 HelloWorld.java
27/02/2015  14:44            37,376 libHelloWorld.dll
               3 File(s)         38,320 bytes
               2 Dir(s)  123,847,589,888 bytes free
</dir></dir>

... and typed the command ...

java -Djava.library.path=C:\Users\Richard\Documents\Java\jni2\test test/HelloWorld

receiving the result

Iside C++ native method HELLOOOOOOOOOOOOOOOOOOO

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