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如何将 c++ 程序链接到 jvm（java 虚拟机）？

tag-icon • tag-icon java environment-variables jdk openjdk
如何将 c++ 程序链接到 jvm（java 虚拟机）？

我正在尝试关注这教程从 c++ 程序创建 JVM。程序编译成功，但运行时失败，提示

error while loading shared libraries: libjvm.so: cannot open shared object file: No such file or directory

该程序（它是从链接教程直接复制的）：

#include <jni.h>
#include <iostream>


using namespace std;
int main()
{
   JavaVM *jvm;                      // Pointer to the JVM (Java Virtual Machine)
   JNIEnv *env;                      // Pointer to native interface
       //================== prepare loading of Java VM ============================
   JavaVMInitArgs vm_args;                        // Initialization arguments
   JavaVMOption* options = new JavaVMOption[1];   // JVM invocation options
   options[0].optionString = "-Djava.class.path=.";   // where to find java .class
   vm_args.version = JNI_VERSION_1_6;             // minimum Java version
   vm_args.nOptions = 1;                          // number of options
   vm_args.options
   = options;
   vm_args.ignoreUnrecognized = false;     // invalid options make the JVM init fail
       //=============== load and initialize Java VM and JNI interface =============
   jint rc = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);  // YES !!
   delete options;    // we then no longer need the initialisation options.
   if (rc != JNI_OK) {
          // TO DO: error processing...
         std::cin.get();
         exit(EXIT_FAILURE);
   }
      //=============== Display JVM version =======================================
   cout << "JVM load succeeded: Version ";
   jint ver = env->GetVersion();
   cout << ((ver>>16)&0x0f) << "."<<(ver&0x0f) << endl;

   // TO DO: add the code that will use JVM <============  (see next steps)

   jvm->DestroyJavaVM();
   cin.get();
}

生成文件：

CC=g++
CFLAGS=-c -Wall 
SOURCES= main.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=searchEngineCpp
PROG_PATH = /

all: $(SOURCES) $(EXECUTABLE)

$(EXECUTABLE): $(OBJECTS) 
    $(CC) $(OBJECTS) -o $@ -L/usr/bin/java -L/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server -ljvm

.cpp.o:
   $(CC) $(CFLAGS) $< -o $@ -g -I/usr/lib/jvm/java-8-openjdk-amd64/include -I/usr/lib/jvm/java-8-openjdk-amd64/include/linux

clean:
   rm -rf *.o searchEngineCpp

我尝试使用以下方法设置 LD_LIBRARY_PATH

export LD_LIBRARY_PATH=/usr/lib/jvm/java-7-oracle/lib/amd64:/usr/lib/jvm/java-7-oracle/lib/amd64/server

我看到一些帖子建议确保 JAVA_HOME 变量指向；我确保它指向上述文件夹。

还有其他帖子建议跑步sudo R CMD javareconf

那里有 JAVA_HOME 变量/usr/lib/jvm/default-java。我该怎么办？

答案1

您应该能够使用LD_LIBRARY_PATH，但是您需要确保使用与 Makefile 链接器命令中给出的相同路径，即

LD_LIBRARY_PATH=/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server

（FWIW 您不需要-L/usr/bin/java链接器命令。）

您可以使用 ex 检查路径是否正确ldd。

LD_LIBRARY_PATH=/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server ldd ./searchEngineCpp

对于更持久的解决方案，您可以将文件添加到/etc/ld.so.conf.d/目录中，然后运行ldconfig以更新动态链接器缓存。名称并不重要，只要它对您有意义即可。例如：

echo '/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/amd64/server' | 
  sudo tee -a /etc/ld.so.conf.d/java-8-openjdk-amd64.conf

sudo ldconfig

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