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This is a small guide for people how want to Speed up their development by swapping changed code during run time, which eliminates the need to constantly restart the Minecraft-Client. To reach our goal we need to install Hotswap and DCEVM. To install DCEVM you first need to download the newest release for java 8 form this link: https://github.com/dcevm/dcevm/releases Before you continue installing DCEVM you need to first install the right java version that matches your download. Most likely this will be the version 1.8.0_181. The download list can be found here: https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html To now install DCEVM run java -jar "path_to_the_installer/DCEVM-8u181-installer.jar" as Administrator in your console. In the UI that pops up you need to select the java version you just installed and click on Install DCEVM as altjvm. You probably need to do this for the jdk and jre. Next download the hotswap-agent and place the jar file in an appropriate folder. https://github.com/HotswapProjects/HotswapAgent/releases Now the Basic setup is finished, our next step is too setup Intellij and gradle two run correctly. First thing you need to do is to install the HotswapAgent plugin for Intellij. Plugins can be install under: Settings -> Plugins -> Marketplace Search for hotswapagent. Now under Tools -> HotswapAgent select Enable HotswapAgent in all configurations Under Keymap search for "Reload Changed Classes" and assign a Keyboard shortcut. Now press double shift and search for "Registry..." and enable compiler.automake.allow.when.app.running Finally to run the Minecraft client create a new gradle configuration with task = "runClient" and VM options = "-Xmx3G -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5010 -XXaltjvm=dcevm -XX:+UnlockExperimentalVMOptions -javaagent:path_to_your\hotswap-agent-1.4.0.jar" Now your good to go. If you have any questions or suggestions feel free to comment below this is my first tutorial so if you have any advise it would be more than welocome. I hope this is helpful for you have a nice Day.

Vanilla and forge does not create any. As for an open source mod that does, there are plenty. However, I have not looked into them enough to give my approval of their practices and code. For that reason, I do not want to give you any links in case I promote such bad practices or outdated methods.

This cannot apply to all living entities. You would probably need to use an event, either PlayerInteractEvent$EntityInteract or PlayerInteractEvent$EntityInteractSpecific, to handle the logic instead.