c++ - 加载共享库时出错:jvm.dll

我正在尝试使用C ++代码运行Java程序。我尝试下面的代码

#include<jni.h>
#include<stdio.h>

int main(int argc, char** argv) {

    JavaVM* vm;
    JNIEnv* env;
    JavaVMInitArgs vm_args;
    vm_args.version = JNI_VERSION_1_2;
    vm_args.nOptions = 0;
    vm_args.ignoreUnrecognized = 1;

    // Construct a VM
    jint results = JNI_CreateJavaVM(&vm, (void**)& env, &vm_args);

    // Construct a String
    jstring jstr = env->NewStringUTF("Hello World");

    // First get the class that contains the method you need to call
    jclass clazz = env->FindClass("java/lang/String");

    // Get the method that you want to call
    jmethodID to_lower = env->GetMethodID(clazz, "toLowerCase",
            "()Ljava/lang/String;");
    // Call the method on the object
    jobject result = env->CallObjectMethod(jstr, to_lower);

    // Get a C-style string
    const char* str = env->GetStringUTFChars((jstring)result, NULL);

    printf("%s\n", str);

    // Clean up
    env->ReleaseStringUTFChars(jstr, str);

    // Shutdown the VM.
    vm->DestroyJavaVM();
}

我用下面的命令来编译代码

g++ LoadJVM.c -I/c/apps64/Java/jdk-11.0.1/include -I/c/apps64/Java/jdk-11.0.1/include/win32 -L/c/apps64/Java/jdk-11.0.1/lib/ -ljvm

它编译正常，但是当我运行如下所示的可执行文件时，我面临错误

./a.exe

错误

error while loading shared libraries: jvm.dll: cannot open shared object file: No such file or directory

知道为什么这个jvm.dll没有被加载吗？


  PS：我正在Windows 10上从Git-Bash编译并运行。

最佳答案

似乎找不到您的jvm.dll。

假设我们已经安装了32位MinGW（这是我安装的版本）。

simple.cc

#include<jni.h>
#include<stdio.h>

int main(int argc, char** argv) {

    JavaVM* vm;
    JNIEnv* env;
    JavaVMInitArgs vm_args;
    vm_args.version = JNI_VERSION_1_2;
    vm_args.nOptions = 0;
    vm_args.ignoreUnrecognized = 1;

    // Construct a VM
    jint results = JNI_CreateJavaVM(&vm, (void**)& env, &vm_args);

    printf("Hello");

    // Shutdown the VM.
    (*vm).DestroyJavaVM();
}

编译与执行

> export JAVA_HOME="/c/Program\ Files\ \(x86\)/Java/jdk1.8.0_211/"
> export PATH="/c/Program Files (x86)/Java/jdk1.8.0_211/jre/bin/server/":"$PATH"
> g++ -o simple simple.cc -I"$JAVA_HOME/include/" -I"$JAVA_HOME/include/win32/" -L"$JAVA_HOME/lib" -ljvm
> ./simple
Hello

您必须确保在jvm.dll中的%PATH%-$PATH上可见git-bash。

关于c++ - 加载共享库时出错:jvm.dll，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/56403503/