JVM不会使用JNI从环境变量类路径加载jar文件 [英] JVM does not load jar file from Enviroment Variable classpath using JNI

问题描述

请考虑以下代码.

    JavaVM * jvm;
    JNIEnv *env;
    JavaVMInitArgs vm_args;
    JavaVMOption options;
    options.optionString ="-Djava.class.path=D:\\Work\\mybytes.jar";
    vm_args.version = JNI_VERSION_1_6; 
    vm_args.nOptions = 1;
    vm_args.options = &options;
    vm_args.ignoreUnrecognized = 0;
    JNI_GetDefaultJavaVMInitArgs(&vm_args);
    int ret = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
    if(ret >=0)
    {
      jclass myBytesClass=env->FindClass("MyBytes");
      jmethodID myByteConstructor=env->GetMethodID(myBytesClass,"<init>","()V");
      myByteObj=env->NewObject(myBytesClass,myByteConstructor,NULL);
      char* printBytes=env->GetMethodID(myBytesClass,"printBytes","([B)V");
    }

我不希望在Code中使用此语句.

I do not want this statement in Code.

options.optionString =-Djava.class.path = D:\ Work \ mybytes.jar";

我想将此jar文件添加到环境变量的类路径中. 但是当我将此jar文件添加到classpath变量时，jvm不会加载此jar文件. 我不知道为什么会这样?

I want to add this jar file in classpath in environment variable. but when i add this jar file to classpath variable the jvm does not load this jar file. i do not know why this happen?

推荐答案

 JNI_GetDefaultJavaVMInitArgs(&vm_args);

在该行之后移动选项字符串的设置. (认为​​您实际上可以将其全部删除，所以不再需要它了.)

Move your setting of the option string after that line. (Think you can actually remove it all together, don't think its needed anymore)

这篇关于JVM不会使用JNI从环境变量类路径加载jar文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！