FindClass 找不到类解决方法

FindClass 找不到类
c++ 调用  java

编译环境   linux  Ubuntu13.10
JDK 信息

[email protected]:/usr/java# echo $JAVA_HOME
/usr/java/jdk1.7.0_65

[email protected]:/usr/java# echo $CLASSPATH
.:/usr/java/jdk1.7.0_65/lib:/usr/java/jdk1.7.0_65/jre/lib:

[email protected]:/# echo $JAR_HOME 
/usr/java/jdk1.7.0_65/jre

[email protected]:/# echo $PATH
/usr/java/jdk1.7.0_65/bin:/usr/java/jdk1.7.0_65/jre/bin
[code=c]

在home目录下建议个com目录，然后再在com目录下建一个test目录
[code=c]
[email protected]:/home/com/test# pwd
/home/com/test

编写一个java程序

[email protected]:/home/com/test# cat MyAdd.java 
package com.test;
public class MyAdd.j{
    public static int add(int a, int b)
    {
        return a+b;
    }  
}
[email protected]:/home/com/test# javac MyAdd.java 
[email protected]:/home/com/test# ls
MyAdd.class  MyAdd.java

这里需要用javah生成 MyAdd.h文件吗？

然后写一个test.cpp 文件

#include <jni.h>
#include <stdio.h>

int main()
{ 
    JavaVM * jvm = (JavaVM *)0;
    JNIEnv * env = (JNIEnv *)0;
    JavaVMInitArgs vm_args;
    long status;
    jclass cls;
    jmethodID mid;
    jint square;
    jboolean jnot;
    jobject jobj;
    
    vm_args.version = JNI_VERSION_1_6;

    vm_args.options = (JavaVMOption *)0;
    vm_args.ignoreUnrecognized = JNI_FALSE;

    status = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
    if(status != JNI_ERR)
    {
        cls = env->FindClass("com/test/MyAdd"); 
        if(cls != 0)
        {
            printf("find java class success\n");

            
            mid = env->GetMethodID(cls, "<init>", "(V)");
            if(mid != 0)
            {
                jobj = env->NewObject(cls, mid);
                printf("init ok!\n");
            }

            // 调用add函数
            mid = env->GetStaticMethodID(cls, "add", "(II)I");
            if(mid != 0)
            {
                square = env->CallStaticIntMethod(cls, mid, 5, 5);
                printf("square :%d\n", square);
            }
        }
        else
        {
            fprintf(stderr, "FindClass failed!\n");
        }
        
        jvm->DestroyJavaVM();
        fprintf(stdout, "Java VM destry!\n");
        return 0;
    }
    else
    {
        printf("create java jvm fail\n");
        return -1;
    }
}

编译

[email protected]:/home/com/test# cat make.sh 
g++ -o test \
-I/usr/java/jdk1.7.0_65/include \
-I/usr/java/jdk1.7.0_65/include/linux \
-L/usr/bin/java \
-L/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/serve test.cpp -ljvm 

[email protected]:/home/com/test# ls
MyAdd.class  MyAdd.java  make.sh  test  test.cpp
[email protected]:/home/com/test# ./test 
FindClass failed!
Java VM destry!