This is possible with a mostly Java application (assuming you're willing to venture into user-space network stacks with either a JNI bridge or shared memory wit

This is possible with a mostly Java application (assuming you're willing to venture into user-space network stacks with either a JNI bridge or shared memory with a C/C++/Rust). You only really people go out of their way for this when doing HFT or very high throughput networking apps.