This page contains some of the most common issues happening in MinecraftEdu and how to resolve them.
- 1 Installation Issues
- 2 MinecraftEdu Issues
- 3 Network Issues
Issues related to installation of MinecraftEdu.
Cannot launch installer
If nothing happens when you run the installer or running it opens a folder structure then there is an issue with Java. Either you don't have Java installed (download and install here) or it is not the default software to open a .jar file. If you have Java installed try the following: Righ click the installer -> Open with -> Java.
The installer checks if you have permission to write and read to the selected install folder. If this check fails you need to either allow read / write actions to the install folder or install somewhere else where where you have these permissions.
Issues related to launching MinecraftEdu.
Cannot launch MinecraftEdu
Java version 1.8.0_20 was known to cause MinecraftEdu to not launch. Now there is a fix available. Read more here.
If nothing happens or just a small window with nothing in it appears when you try to start MinecraftEdu from the Launcher there are few thing you can try:
Update your video card drivers Make sure you have read / write access to the install folder Remove any mods that you might have
If none of the above helped you can enable the debug mode in your Launcher and send us some log files to help us find the issue. Follow these steps:
Start the Launcher Go to Client settings in the top menu Select Advanced Set Debug mode on Save settings Try to run MinecraftEdu again After MinecraftEdu fails to launch go to "minecraftedu/debug/" folder Send us all .log files from the debug folder to firstname.lastname@example.org and we'll try to help
LWJGL pixel format not accelerated
This problem is caused if your computer's video card does not support later versions of OpenGL or you have old video card drivers. First solution would be to update your video card drivers.
Cannot connect to the server / Server is not visible to the clients
* Double check the ip-address * Make sure both the clients and server are running the exact same version and build of MinecraftEDU * Make sure server machine and client machines are connected to the same network * Make sure there is no antivirus or firewall on the server machine that might be blocking the connections * MinecraftEdu uses port 25565 for the connections. Make sure that is open in your router (contact your it-support)
Cannot allocate more than 1GB of RAM / Could not create Java virtual machine
* If you have a 32-bit operating system, allocating more than 1GB of ram is not possible. * If you have a 64-bit operating system, make sure you have 64-bit Java installed. * Do not allocate more than half of your total ram to MinecraftEdu.
Issues related to networking inside MinecraftEdu.
Opening Network Ports for Minecraft
NOTE! This is for the original game. If you are using MinecraftEdu in a local environment (i.e. a classroom), you actually don't need to open those outside ports or worry about proxies.
In most situations, Minecraft "just works". But if you run into problems, this is what needs to be unblocked in order to play Minecraft on a network:
- For logging in, login.minecraft.net is used over port 443 (HTTPS)
- For joining the servers, a request is sent to session.minecraft.net over port 80 (HTTP)
- And the default port for servers is 25565 (TCP), however this port can be configured through the server settings.
- Minecraft does not support proxies, if that's an issue. (But MinecraftEdu does).