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Java Native Interface

  Asked By: Emily    Date: Feb 10    Category: Java    Views: 1074
  

Does anyone have any experience with JNI? I am trying to startup a
JVM as a subsystem of a C++ program but I'm having trouble figuring
out exactly how to get the JVM started. Here's my code:

JavaVM *jvm;
JNIEnv *env;
JavaVMInitArgs vm_args;
vm_args.version = JNI_VERSION_1_4;
JNI_GetDefaultJavaVMInitArgs(&vm_args);
JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);

This linker can't find implementations for JNI_CreateJavaVM() or
JNI_GetDefaultJavaVMInitArgs() yet they're declared in jni.h

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4 Answers Found

 
Answer #1    Answered By: Helene Stewart     Answered On: Feb 10

Does anyone have any experience with JNI? I am trying to startup  a
JVM as a subsystem of a C++ program  but I'm having trouble  figuring
out exactly how to get the jvm  started. Here's my code:

JavaVM *jvm;
JNIEnv *env;
JavaVMInitArgs vm_args;
vm_args.version = JNI_VERSION_1_4;
JNI_GetDefaultJavaVMInitArgs(&vm_args);
JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);

This linker can't find  implementations for JNI_CreateJavaVM() or
JNI_GetDefaultJavaVMInitArgs() yet they're declared in jni.h

 
Answer #2    Answered By: Feodora Bonkob     Answered On: Feb 10

Do you happen to know off the top of your head the path to the JNI
library?

 
Answer #3    Answered By: Della Simpson     Answered On: Feb 10

Nope... It will most likely vary based on the VM and platform you are using.
For instance, on my Gentoo Linux box it is
in /opt/blackdown-jdk-1.4.2_rc1/jre/lib/i386/. I believe that (don't quote
me on this) the Sun RPM for Redhat linux puts links to the libraries
in /usr/lib/, and puts the actual libraries somewhere
under /usr/sun-jdk-1.4.2/. I suspect that everything you need can be found
in %JAVA_HOME%\jre\lib\i386 on Windows, but I don't currently have access to
a windows box to verify that.

 
Answer #4    Answered By: Devrim Yilmaz     Answered On: Feb 10

For those who may be interested, http://www.ikvm.net has Java/C#
integration solution. I have yet to test it out but it claims to be a
JVM written in C# so you can ustilize Java classes within the CLR.
Interesting ....

 
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