Ubuntu – Can’t get OpenJDK Java 7 Runtime to open ‘minecraft.jar’ file

javaopenjdk

I have 64bit Ubuntu 12.10 installed with an Intel® Core™ i5-3570K CPU. I use Chromium. I have installed OpenJDK 7 but whenever I right-click the .jar file and click "open with openjdk java 7 runtime" nothing happens at all. I have tried this with OpenJDK 6 and nothing happens.

Could it be a 64bit conflict? I have also tried a different minecraft.jar and nothing changed. The .jar is set to executable.

Please help.

Best Answer

Try starting it from the terminal instead using this method:

Open the terminal again Applications > Accessories > Terminal Enter the following commands, substituting 'minecraft_server' with the name of the folder you extracted the server to:

cd minecraft_server
java -Xms1G -Xmx1G -jar minecraft.jar nogui

Taken from http://www.minecraftwiki.net/wiki/Tutorials/Setting_up_a_server#Ubuntu

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Ubuntu Tweaks is a useful program that can manage this I think. Install and run it, then go to Admins > File Type Manager, select Category 'All' then find 'Java archive'. Edit that, and if it is not on the list, use the Add button, and select it, or use the 'Custom command' option at the bottom.

Ubuntu – Unable to open .jar files with Java

You seem to be using a development version of java : Java 9 has not been released yet.

So, first of all, you should remove this version of java, and install the default one :

sudo apt-get remove openjdk-9-*
sudo apt-get install default-jre

Depending on your version of Ubuntu, it should be a version 7 or 8. If you're on a development version of Ubuntu, you might need to choose version 8 : sudo apt-get install openjdk-8-jre

Then you should be able to run Minecraft.

By the way, the simplest method to install it is to use the PPA instead of trying to run the .jar by hand :

sudo add-apt-repository ppa:minecraft-installer-peeps/minecraft-installer
sudo apt-get update
sudo apt-get install minecraft-installer

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