在调用DestroyJavaVM之后，重新调用JNI

本文介绍了在调用DestroyJavaVM之后，重新调用JNI_CreateJavaVM会返回-1的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我试图在调用DestroyJavaVM之后回忆起JNI_CreateJavaVM。

I am trying to recall JNI_CreateJavaVM after calling DestroyJavaVM.

我按以下顺序调用它们：InitJVM - > ReleaseJVM - > InitJVM

I call them in following order: InitJVM -> ReleaseJVM -> InitJVM

首次初始化时，JNI_CreateJavaVM返回0并正常工作。 第二次在销毁后初始化时，JNI_CreateJavaVM返回-1并且不起作用。

First time when initialing, JNI_CreateJavaVM returns 0 and works fine. second time when initialing after destroying, JNI_CreateJavaVM return -1 and does not work.

会出现什么问题？

这是一个创建JVM的函数：

Here is a function that create JVM:

#elif __linux HRESULT PWNJava::InitJVM(void) { if(m_bRunning) { Log("Error : JVM is already Running! (PWNJava::Init)"); return PWN_FAIL; } const int kNumOptions = 3; JavaVMOption options[kNumOptions] = { { const_cast<char*> ("-Xmx128m"), NULL}, { const_cast<char*> ("-verbose:gc"), NULL}, { const_cast<char*> ("-Djava.class.path=../../Class"), NULL} }; JavaVMInitArgs vm_args; vm_args.version = JNI_VERSION_1_6; vm_args.options = options; vm_args.nOptions = sizeof (options) / sizeof (JavaVMOption); assert(vm_args.nOptions == kNumOptions); int res = JNI_CreateJavaVM(&jvm, reinterpret_cast<void**> (&env), &vm_args); if (res != JNI_OK) { Log("Error : createJavaVM(&jvm, &env, &vm_args)"); return PWN_FAIL; } m_bRunning = true; Log("Success : PWNJava::Init"); return PWN_OK; } #endif

这是一个删除JVM的函数：

Here is a function deleting JVM:

void PWNJava::ReleaseJVM(void) { if (jvm) jvm->DestroyJavaVM(); jvm = NULL; delete jvm; env = NULL; delete env; m_bRunning = false; Log("Success : PWNJava::ReleaseJVM"); }

推荐答案

上次我看了 JNI_DestroyJVM（），它说但JDK / JRE仍然不支持VM卸载。只是不要调用它，也不要重新初始化它。

Last time I looked at JNI_DestroyJVM(), it said "The JDK/JRE still does not support VM unloading, however." Just don't call it, and don't re-initialize it either.