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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.

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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

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I don't understand 'substituting 'minecraft_server' with the name of the folder you extracted the server to:' i just have a file called minecraft.jar in my downloads folder :L – Chris Oct 24 '12 at 16:06
Replace minecraft_server.jar with minecraft.jar. and the downloads folder is at /home/(ur username)/downloads" – alexander7567 Oct 24 '12 at 20:25

Use the OpenJDK Java 6 runtime, not the Java 7 runtime. In Nautilus (the file manager), right-click on the file, go to Properties > Permissions, and click the checkbox to allow executing the file as a program.

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Why OpenJDK 6 instead of 7? – Eliah Kagan Jan 23 '13 at 3:35

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