Comment by pron

FFM is the recommended alternative, but JNI is not being deprecated. There are some things that JNI can do that FFM can't, in particular - initiating calls from native code to arbitrary Java methods. FFM only supports upcalls to Java in the form of Java callbacks that are passed to the native code. However, this is enough for the vast majority of Java-native interactions, so FFM should be preferred in new code (it's much easier to use than JNI).