Jni

[ami]

Hello,

I'm in the process of writing C++ code which builds a JVM object which allows me to invoke Java methods from within C++.

My code is doing something similar to this :-

#include <jni.h> /* where everything is defined */

...

JavaVM *jvm; /* denotes a Java VM */
JNIEnv *env; /* pointer to native method interface */

JDK1_1InitArgs vm_args; /* JDK 1.1 VM initialization arguments */

vm_args.version = 0x00010001; /* New in 1.1.2: VM version */
/* Get the default initialization arguments and set the class
* path */
JNI_GetDefaultJavaVMInitArgs(&vm_args);
vm_args.classpath = ...;

/* load and initialize a Java VM, return a JNI interface
* pointer in env */
JNI_CreateJavaVM(&jvm, &env, &vm_args);

/* invoke the Main.test method using the JNI */
jclass cls = env->FindClass("Main");
jmethodID mid = env->GetStaticMethodID(cls, "test", "(I)V");
env->CallStaticVoidMethod(cls, mid, 100);

/* We are done. */
jvm->DestroyJavaVM();


I there a way of getting the System properties, i.e. can I do from C++ :-
...
Properties p = new Properties();
p.list(System.out);
...

As you can see this is pure Java code, but I'd like to embed it in my above C++. Also, would I be able to do setProperty() from C++ ?

The reason I need this is because I don't have access to the Java code at all.

Many thanks.