jobject result = env->CallObjectMethod(javaObject, methodID);
jint value = env->GetIntField(javaObject, fieldID);
jobject newObject = env->NewObject(javaClass, constructorID);These functions are part of the JNI library, which is typically included in the Java Development Kit (JDK). In order to use JNIEnv in C++ code, the jni.h header file must be included and the Java Virtual Machine (JVM) must be initialized. The package library for JNIEnv is: Java Native Interface (JNI).