12.9. Using the Invocation API

Up to now, we have considered programs in the Java programming language that made a few C calls, presumably because C was faster or allowed access to functionality inaccessible from the Java platform. Suppose you are in the opposite situation. You have a C or C++ program and would like to make calls to Java code. The invocation API enables you to embed the Java virtual machine into a C or C++ program. Here is the minimal code that you need to initialize a virtual machine:

JavaVMOption options[1]; JavaVMInitArgs vm_args; JavaVM *jvm; JNIEnv *env; options[0].optionString = "-Djava.class.path=."; memset(&vm_args, 0, sizeof(vm_args)); vm_args.version = JNI_VERSION_1_2; vm_args.nOptions ...

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