You can embed a JVM within your application. Oracle’s official reference book has some more details. The synopsis of it is:
#include <jni.h> /* where everything is defined */ int main() { 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 could have created an Object and called methods on it instead */ /* We are done. */ jvm->DestroyJavaVM(); }
You can do far more sophisticated things if you want (e.g. custom class loaders) but that’s about it in terms of the bare minimum needed to get a JVM working within your application.