UNntu的JNI UnsatisfiedLinkError;

时间:2013-06-11 18:10:22

标签: java-native-interface unsatisfiedlinkerror

我已经在stackoverflow上查找了类似的问题,但我找到的解决方案似乎都没有为我工作。我在Linux / Ubuntu机器上。我刚刚练习JNI,但是我收到了这个错误:

Exception in thread "main" java.lang.UnsatisfiedLinkError: nativetest.sayHello(Ljava/lang/String;)Ljava/lang/String;
at nativetest.sayHello(Native Method)
at nativetest.main(nativetest.java:8)

我提供了我的.c,.h和.java文件。

.java文件:

public class nativetest
{
System.loadLibrary("nativetest");

public native String sayHello(String s);

 public static void main(String[] argv)
 {
 String retval = null;
 nativetest nt = new nativetest();
 retval = nt.sayHello("Hi");
 System.out.println("Invocation returned " + retval);
 }
}

.c文件:

#include "nativetest.h"
#include <stdio.h>
#include <jni.h>
#include <stdlib.h>

JNIEXPORT jstring JNICALL Java_nativetest_sayHello(JNIEnv *env, jobject thisobject, jstring js)
{
  return js;
}

.h文件:

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

#ifndef _Included_nativetest
#define _Included_nativetest
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     nativetest
 * Method:    sayHello
 * Signature: (Ljava/lang/String;)Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_nativetest_sayHello
  (JNIEnv *, jobject, jstring);

#ifdef __cplusplus
}
#endif
#endif

我使用这些命令生成.h文件,编译/生成.so文件,然后运行:

javac nativetest.java

javah -jni nativetest

gcc --shared -o libnativetest.so -I / usr / lib / jvm / java-7-openjdk-amd64 / include -I / usr / lib / jvm / java-7-openjdk-amd64 / include / linux nativetest.c

java -Djava.library.path =。 nativetest

我目前在libnativetest.so文件和所有.c,.java和.h文件的目录中。

任何帮助都将不胜感激。

1 个答案:

答案 0 :(得分:0)

好的,结果是对

的号召
System.loadLibrary("nativetest");

应该是静态的:

static{
System.loadLibrary("nativetest");
}

我在使用javac进行重新编译时也犯了错误。我是Linux新手:)