You can check which Java version is on your Mac to see if you have the most up-to-date Java running, or you can check on the Java website.

To check which version of Java you have on your Windows computer, you'll need to open the Command Prompt.

2] Check Java Security settings To do this, first, go to Control Panel. Then adjust the view to Small Icons from the upper right side. Scroll through, look for and click on Java.

Allocate more RAM: To do so, open Minecraft Launcher. Go to settings, and then under Java Settings, allocate more RAM. It will help, especially if you are using the mods. Check the Java Version ...