How to enable Intellij hot code swap

Question

Intellij does not seem to be doing basic hot code swap on my installation.

For this code:

public class MainTest {
    public void method1() {
                


        

Answer 1

Go to Setting --> Select Debug --> HotSwap

Answer 2

For anyone experiencing the same problem as me, you might have incurred in the following recent bug affecting the 2020.2 update: https://youtrack.jetbrains.com/issue/IDEA-247530?_ga=2.116305920.729836936.1599654650-984156210.1599654650

TL;DR As a workaround, you need to re-activate the Groovy plugin.