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I have a problem running .jar files by double-clicking them. When I go to the Properties dialogue I can't find Java--only Archive Manager in the list of programs. But java -jar somefile.jar opens the program.

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3 Answers 3

up vote 7 down vote accepted

Maybe you don’t have the runtime environment installed!

To install it try the following instructions.

sudo apt-get install openjdk-7-jre

Or you could install Oracle JRE using the PPA method with the following commands.

sudo add-apt-repository ppa:ferramroberto/java
sudo apt-get update
sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts

Then to use it to open .jar files try the following.

  1. Right click the .jar file > Properties.
  2. Click on the “Open With” tab along the top.
  3. Change the default choice to be Sun Java 6 Runtime.
  4. Click Close and you should be ready to double click.
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To make Java open .jar files per default (i.e. double click) right click on any .jar file to select Properties. In the following window select the "Open With" tab to see e.g. the follwing choice:

enter image description here

Select your Java runtime and press Set as default to make this your default application to open .jar files.

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APPLICATION LAUNCHER

After installing the Java runtime environment you can create a launch icon like other applications in the sistem by making a *.desktop file.
It makes things easier and prettier!

  • Create a folder in a directory of your choice with the *.jar (the application) and *.png (the application icon) files. In this case the directory I will use is /usr/share/folder. For the ~/folder is a good idea to name it with the application name, for example, if the application is VUE name the folder ~/VUE or ~/vue.

    Open the terminal and run the following code line:

    sudo mkdir /usr/share/folder

    Or open your file manager (Nautilus in this case) with super admin privileges by runing the following code line in the terminal:

    gksu nautilus

    After that, go to /usr/share and create the folder folder with the GUI.

  • Also in the terminal and run the following code line:

    sudo gedit /usr/share/applications/*.desktop

(You could use your editor of choice. In this case was used Gedit.)

  • Paste the following code lines in the file you are editing:

    [Desktop Entry]  
    Encoding=UTF-8  
    Name=Name  
    Categories=Category Name  
    Exec=java -jar /usr/share/folder/*.jar  
    Icon=/usr/share/folder/*.png  
    StartupNotify=false  
    Terminal=false  
    Type=Application  
    Comment=Application Name  
    StartupWMClass=Class  
    MimeType=application/*
    
  • Save the file.

(The * is always the same name.)


APPLICATION ICON

For the icon sizes, Linux support a variety of image formats (PNG, JPG, SVG, etc.) and sizes (16x16 ~ 512x512 px). You could use a 32x32 ~ 96x96 px PNG file, or a 128x128 ~ 512x512 px SVG file for better results. In this case I think that a 96x96 px PNG is enough for a nice Desktop/Dash.

For more, take a look at:


FILE ASSOCIATION

For this step you have to create a MIME Tipe, if it doesn't exist, and associate it with the application in the mimeapps.list file. For that take a look on the following:


Note: If you find something incorrect, please feel free to edit and correct. Thanks!

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