Java 在C+中使用JNI创建JVM+;不回来
我正在尝试为我的服务器java程序启动Java 在C+中使用JNI创建JVM+;不回来,java,c++,java-native-interface,Java,C++,Java Native Interface,我正在尝试为我的服务器java程序启动jvm。服务器java程序在内部启动另一个java进程,我调用的类/方法具有system.exist(0) 我的程序运行良好,它启动了所需的java进程,但是程序控制不会回到C++。它只是存在,即父进程死亡。 这是我的完整代码 #include <stdexcept> #include <windows.h> #include <tchar.h> #include <strsafe.h> #includ
jvm
。服务器java程序在内部启动另一个java
进程,我调用的类/方法具有system.exist(0)
我的程序运行良好,它启动了所需的java进程,但是程序控制不会回到C++。它只是存在,即父进程死亡。
这是我的完整代码
#include <stdexcept>
#include <windows.h>
#include <tchar.h>
#include <strsafe.h>
#include <include/jni.h>
#include <string>
#include <stdlib.h>
#include <vector>
#include <iostream>
#include <signal.h>
class JVMLauncherException : public std::runtime_error {
public:
JVMLauncherException(const std::string& message) : std::runtime_error(message)
{
};
};
class Server_JVMLauncher {
public:
Server_JVMLauncher();
void addJars(std::string inJar);
void LaunchJVM();
void StartServer_Server();
void AddServerArguments(std::string);
void StopServer_Server();
private:
typedef jint (JNICALL *CreateJavaVM)(JavaVM **pvm, void **penv, void *args);
HINSTANCE m_hDllInstance;
std::string m_JavaHome;
std::string m_ProductLibDir;
std::string m_JvmDllLocation;
CreateJavaVM m_JVMInstance;
jclass m_CacheServerLauncherClass;
jmethodID m_MainMethodID;
JNIEnv *m_JVMEnv;
JavaVM *m_RunningJVMInstance;
std::vector<std::string> m_listOfJars;
std::vector<std::string> m_ServerArguments;
void CheckForJNIException();
protected:
};
Server_JVMLauncher::Server_JVMLauncher() {
// Check for JAVA_HOME
char *pValue;
size_t len;
errno_t err = _dupenv_s( &pValue, &len, "JAVA_HOME" );
if ( err ) {
throw JVMLauncherException("JAVA_HOME not defined");
}
m_JavaHome = pValue;
m_JvmDllLocation = m_JavaHome + "\\jre\\bin\\client\\jvm.dll";
err = _dupenv_s( &pValue, &len, "Server_" );
if ( err ) {
throw JVMLauncherException("Server_ not defined");
}
m_ProductLibDir = pValue;
m_listOfJars.push_back("dep1.jar");
m_listOfJars.push_back("dep2.jar");
m_listOfJars.push_back("dep3.jar");
m_listOfJars.push_back("dep4.jar");
m_listOfJars.push_back("dep5.jar");
}
void Server_JVMLauncher::AddServerArguments(std::string inParam) {
m_ServerArguments.push_back(inParam);
}
void Server_JVMLauncher::LaunchJVM() {
// Construct the product specific class path.
std::string strJavaClassPath = "-Djava.class.path=";
for ( std::size_t idx = 0; idx < m_listOfJars.size() - 1 ; idx++) {
strJavaClassPath += m_ProductLibDir + "\\lib\\" + m_listOfJars[idx] + ";";
}
strJavaClassPath += m_ProductLibDir + "\\lib\\" + m_listOfJars[m_listOfJars.size() - 1] ;
// consruct java.library.path
std::string strJavaLibraryPath = "-Djava.library.path=";
strJavaLibraryPath += m_JavaHome + "\\lib" + "," + m_JavaHome + "\\jre\\lib";
// try loading jvm dll
m_hDllInstance = LoadLibraryA(m_JvmDllLocation.c_str());
if( m_hDllInstance == 0) {
throw JVMLauncherException("Cannot load jvm.dll");
}
m_JVMInstance = (CreateJavaVM)GetProcAddress(m_hDllInstance, "JNI_CreateJavaVM");
if ( m_JVMInstance == NULL ) {
throw JVMLauncherException("Cannot load jvm.dll");
}
JavaVMOption options[2];
options[0].optionString = const_cast<char*>(strJavaClassPath.c_str());
options[1].optionString = const_cast<char*>(strJavaLibraryPath.c_str());
JavaVMInitArgs vm_args;
vm_args.version = JNI_VERSION_1_6; //JNI Version 1.4 and above
vm_args.options = options;
vm_args.nOptions = 2;
vm_args.ignoreUnrecognized = JNI_TRUE;
//Create the JVM
jint res = m_JVMInstance(&m_RunningJVMInstance, (void **)&m_JVMEnv, &vm_args);
if (res < 0) {
throw JVMLauncherException("Could not launch the JVM");
}
//m_RunningJVMInstance->AttachCurrentThread((void **)&m_JVMEnv, &vm_args);
m_CacheServerLauncherClass = m_JVMEnv->FindClass("com/Server/internal/ServerLauncher");
CheckForJNIException();
m_MainMethodID = m_JVMEnv->GetStaticMethodID(m_CacheServerLauncherClass, "main", "([Ljava/lang/String;)V");
CheckForJNIException();
}
void Server_JVMLauncher::StartServer_Server() {
if ( m_RunningJVMInstance->AttachCurrentThread((LPVOID *)&m_JVMEnv, NULL) ) {
std::cout << "Fail to attach the current thread " << std::endl;
}
jclass StringClass = m_JVMEnv->FindClass("java/lang/String");
int numOfArguments = (int)m_ServerArguments.size() + 2 ;
int argumentIndex = 0;
jobjectArray jargs = m_JVMEnv->NewObjectArray(numOfArguments, StringClass, NULL);
m_JVMEnv->SetObjectArrayElement(jargs, argumentIndex++, m_JVMEnv->NewStringUTF("start"));
std::string strJavaClassPath = "-classpath=";
strJavaClassPath += "\"";
for ( std::size_t idx = 0; idx < m_listOfJars.size() - 1 ; idx++) {
strJavaClassPath += m_ProductLibDir + "\\lib\\" + m_listOfJars[idx] + ";";
}
strJavaClassPath += m_ProductLibDir + "\\lib\\" + m_listOfJars[m_listOfJars.size() - 1] ;
strJavaClassPath += "\"";
m_JVMEnv->SetObjectArrayElement(jargs, argumentIndex++, m_JVMEnv->NewStringUTF(strJavaClassPath.c_str()));
for ( std::vector<std::string>::iterator iter = m_ServerArguments.begin(); iter != m_ServerArguments.end(); ++iter) {
std::string argument = *iter;
m_JVMEnv->SetObjectArrayElement(jargs, argumentIndex++, m_JVMEnv->NewStringUTF(argument.c_str()));
}
m_JVMEnv->CallStaticVoidMethod(m_CacheServerLauncherClass, m_MainMethodID, jargs);
m_RunningJVMInstance->DestroyJavaVM();
std::cout << "I am done with launching java program" << std::endl;
CheckForJNIException();
}
void Server_JVMLauncher::StopServer_Server() {
jclass StringClass = m_JVMEnv->FindClass("java/lang/String");
int numOfArguments = 2 ;
jobjectArray jargs = m_JVMEnv->NewObjectArray(numOfArguments, StringClass, NULL);
m_JVMEnv->SetObjectArrayElement(jargs, 0, m_JVMEnv->NewStringUTF("stop"));
m_JVMEnv->SetObjectArrayElement(jargs, 1, m_JVMEnv->NewStringUTF("-dir=E:\\Avinash\\personal\\work\\CreateJvm\\Debug\\gfecs"));
m_JVMEnv->CallStaticVoidMethod(m_CacheServerLauncherClass, m_MainMethodID, jargs);
CheckForJNIException();
}
void Server_JVMLauncher::CheckForJNIException() {
jthrowable expt = m_JVMEnv->ExceptionOccurred();
if (expt != NULL) {
m_JVMEnv->ExceptionClear();
jmethodID toString = m_JVMEnv->GetMethodID(m_JVMEnv->FindClass("java/lang/Object"), "toString", "()Ljava/lang/String;");
jstring estring = (jstring) m_JVMEnv->CallObjectMethod(expt, toString);
jboolean isCopy;
std::string message = m_JVMEnv->GetStringUTFChars(estring, &isCopy);
throw JVMLauncherException(message);
}
}
int main( int argc, char **argv) {
try {
Server_JVMLauncher instanceServer_;
instanceServer_.LaunchJVM();
instanceServer_.StartServer_Server();
} catch (JVMLauncherException &excp ) {
std::cout << excp.what() << std::endl;
}
return 0;
}
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类JVMLauncherException:public std::runtime\u错误{
公众:
JVMLauncherException(const std::string&message):std::runtime_错误(message)
{
};
};
类服务器JVMLauncher{
公众:
serveru JVM启动器();
void addJars(std::string inJar);
void LaunchJVM();
void StartServer_Server();
void AddServerArguments(std::string);
void StopServer_Server();
私人:
typedef jint(JNICALL*CreateJavaVM)(JavaVM**pvm,void**penv,void*args);
HINSTANCE m_hdlinstance;
std::字符串m_JavaHome;
std::字符串m_ProductLibDir;
std::字符串m_jvmdllocation;
CreateJavaVM m_JVM实例;
jclass m_CacheServerLauncherClass;
jmethodID m_main methodid;
JNIEnv*m_JVMEnv;
JavaVM*m_运行JVM实例;
std::向量m_列表;
std::向量m_参数;
void CheckForJNIException();
受保护的:
};
Server_JVMLauncher::Server_JVMLauncher(){
//检查JAVA_主页
char*pValue;
尺寸透镜;
errno_t err=_dupenv_s(&pValue,&len,“JAVA_HOME”);
如果(错误){
抛出JVMLauncherException(“未定义JAVA_主页”);
}
m_JavaHome=pValue;
m_jvmdllocation=m_JavaHome+“\\jre\\bin\\client\\jvm.dll”;
err=_dupenv_s(&pValue,&len,“Server”);
如果(错误){
抛出JVMLauncherException(“服务器未定义”);
}
m_ProductLibDir=pValue;
m_listOfJars.push_back(“dep1.jar”);
m_listOfJars.push_back(“dep2.jar”);
m_listOfJars.push_back(“dep3.jar”);
m_listOfJars.push_back(“dep4.jar”);
m_listOfJars.push_back(“dep5.jar”);
}
void Server_JVM启动器::AddServerArguments(std::string inParam){
m_ServerArguments.push_back(inParam);
}
void Server_JVMLauncher::LaunchJVM(){
//构造特定于产品的类路径。
std::string strJavaClassPath=“-Djava.class.path=”;
对于(std::size\t idx=0;idxAttachCurrentThread((void**)&m_JVMEnv和vm_args);
m_CacheServerLauncherClass=m_JVMEnv->FindClass(“com/Server/internal/ServerLauncher”);
CheckForJNIException();
m_MainMethodID=m_JVMEnv->GetStaticMethodID(m_CacheServerLauncherClass,“main”,“([Ljava/lang/String;)V”);
CheckForJNIException();
}
void Server_JVM启动器::StartServer_服务器(){
if(m_RunningJVMInstance->AttachCurrentThread((LPVOID*)&m_JVMEnv,NULL)){
std::cout NewObjectArray(numOfArguments,StringClass,NULL);
m_JVMEnv->SetObjectArrayElement(jargs,argumentIndex++,m_JVMEnv->NewStringUTF(“开始”);
std::string strJavaClassPath=“-classpath=”;
strJavaClassPath+=“\”;
对于(std::size\t idx=0;idxSetObjectArrayElement(jargs,argumentIndex++,m_JVMEnv->NewStringUTF(strJavaClassPath.c_str());
对于(std::vector::iterator iter=m_ServerArguments.begin();iter!=m_ServerArguments.end();++iter){
std::string参数=*iter;
m_JVMEnv->SetObjectArrayElement(jargs,argumentIndex++,m_JVMEnv->NewStringUTF(argument.c_str());
}
m_JVMEnv->CallStaticVoidMethod(m_CacheServerLauncherClass,m_MainMethodID,jargs);
运行JVM实例->销毁JavaVM();
std::cout NewObjectArray(numOfArguments,StringClass,NULL);
m_JVMEnv->SetObjectArrayElement(jargs,0,m_JVMEnv->NewStringUTF(“停止”);
m_JVMEnv->SetObjectArrayElement(jargs,1,m_JVMEnv->NewStringUTF(“-dir=E:\\Avinash\\personal\\work\\CreateJvm\\Debug\\gfecs”);
m_JVMEnv->CallStaticVoidMethod(m_CacheServerLauncherClass,m_MainMethodID,jargs);
CheckForJNIException();
}
void Server_JVMLauncher::CheckForJNIException(){
jthrowable expt=m_JVMEnv->ExceptionOccurred();
如果(expt!=NULL){
m_JVMEnv->ExceptionClear();
jmethodID toString=m_JVMEnv->Ge