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1) Install the Codename One Plugin in your IDE
Install the plugin using the plugin manager
Click the Tools -> Plugins menu option and search for Codename One in the available plugins section. Install it.Note: The plugins.netbeans.org server has been down frequently in the past couple of months preventing automatic installation.
Please follow the instructions here as a workaround if the instructions above don't work.
Download & install Java 8. Notice that the new Eclipse plugin requires Java 8 and Eclipse Neon or newer!
Install the plugin using Eclipse Marketplace
In the menu option help -> Eclipse Marketplace search for 'Codename One' and follow the installation process.Note: There's regression in Eclipse Oxygen 4.7.1a that broke the simulator/debugger. There is a workaround mentioned here. We are working on a long term fix for this with the eclipse team.
Download & install Java 8. Notice that while Java 7 will work with other IDE's we no longer support it for IntelliJ!
Download & install IntelliJ/IDEA, notice that Android Studio will not work.
Install the plugin using The Plugin Center
Use the search functionality in the plugin center to find and install the Codename One plugin.