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Shalim Mora
Shalim Mora

Posted on • Updated on

How To Install Extensions in BlueJ if you have Mac OSX

I'm very distracted and I kwnow that there are many people like me, so if you are distracted like me and you wanna install an extension in BlueJ, you have to follow the next steps:

1.- You have to download and Install BlueJ you can go to

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2.- Now you have a BlueJ Folder like this

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3.- Open the folder and Command-click and choose Show Package Contents

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4.- Extensions are installed by placing the extension jar file into an extension directory


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5.- Now open your BlueJ, go to help >installed extensions and you will can see your "installed extensions"

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And in case you didn't see it before, all this information can be found on the same BlueJ page, I found it after reading carefully and searching unsuccessfully all over the web.

BlueJ 5 has a rewritten extensions API explained here. the extensions page still exists for those interested in extensions for BlueJ 4 and older only, but for BlueJ5 and later you can use this extensions


1.- Since BlueJ 5 you can write your own extension, if you wanna find out how to write your own extensions, you can read this
2.- You will need BlueJ extension API documentation
3.- If you wanna share an extension with BlueJ you have to contact them here

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