jar files not working

Question

In terminal when try to run jar file it doesn't launch. I have recently uninstalled open jdk 6 to save some space if that matters.

abe@abe-Dimension-8400:~/Desktop$ java -jar Minecraft.jar

I use openjdk-7-jdk-headless java version. Tried re-installing the openjdk-7-jre-headless

abe@abe-Dimension-8400:~/Desktop$ sudo apt-get install openjdk-7-jre-headless

Reading package lists... Done

Building dependency tree    

Reading state information... Done

openjdk-7-jre-headless is already the newest version.

Please help Thanks.

Answer 1

Setup environment variables.

You should Setup Environment Variables for java because all of java based application’s use environment variables to work. Open your .bashrc file and add the below coloured line to end of the file. Make sure you need to mention your path instead of us. Save and exit.

This is an example taken from http://www.2daygeek.com/how-to-install-java-7-openjdk-on-ubuntu/

magesh@magesh-desktop:~$ nano .bashrc

GNU nano 2.2.6                                    File: .bashrc                                                                              

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi

JAVA_HOME="/usr/lib/jvm/java-7-openjdk-amd64/bin/java"
JRE_HOME="/usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java"
PATH=$PATH:$HOME/bin:JAVA_HOME:JRE_HOME

Answer 2

headless jre/jdk means "GUI is not needed and will not work". I suspect you want Minecraft to be GUI-based game. Then you need full jre.

Frankly "does not work" is not a useful symptom. What makes you believe it doesnt? Maybe you expected something and got something different? It's hard to guess.