Being a long time Eclipse user I recently started using IntelliJ. Here are some notes on how I use it for Java and Kotlin. I will probably update this post continuously.


Here are some of the topics that I thought were most interesting when doing the switch.

Free and Open Source

I don't want to depend on software that is not free and open source. That, to me, feels like a trap and something I want to avoid.

Eclipse is free and open source.

IntelliJ has a community edition that is also free and open source. This is the one I use.

This is totally fine for me. Less is more!

Synchronize Settings

I want to automatically have my IDE setup exactly how I want it and synchronize that to all my installations. Avoiding the time consuming task of searching for settings and clicking checkboxes.

In Eclipse I use Workspace Mechanics. The mechanics files are put under version control so that all developers of a project will have changes applied immediately when someone changes the settings.

In IntelliJ this is built in. In the menu, File -> Settings Repository you can add any git-repository. I just created a new repository on GitHub and is now using that clone URL. To publish settings you do File -> Settings Repository and click Merge.

I have seen that some settings are not synchronized when using IntelliJ. I really miss is automatically download sources and documentation and most annoyingly is the option to optimize imports on the fly.

Intellij - Download sources and documentation
Intellij - Optimize imports on the fly

Opening Several Projects In Same Window

In Eclipse you would create a workspace and import projects in that workspace.

In IntelliJ you create a project and add modules to it. A module can be a Maven, or Gradle, project. You do:

  • File -> New -> Project ...
  • Empty project
  • Name it anything you like
  • Finnish

Now to add a Gradle project to it, you do:

  • File -> New -> Module From Existing Sources...
  • Select the build.gradle file. If it were Maven you would select the pom.xml file

Maintaining a Code Standard

In Eclipse you can setup save actions that will apply the code standard whenever a file is saved.

In IntelliJ I have not found any way of enforcing a code standard. It does a good job on understanding and adhering to how the current file already is formatted.

Automatically Boost Code Quality

In Eclipse I would setup save actions to automatically do things like:

  • Remove unused variables
  • Organize imports, sorting and removing unused imports
  • Adding final keyword to immutable attributes and variables
  • Remove trailing white space

In IntelliJ you can find these settings by simply searching in the settings menu (File -> Settings).

IntelliJ - Settings search

This will organize the imports when you are working with a file. You can also batch this by marking a folder in the menu and press CTRL-ALT-O.

IntelliJ - Batch optimize imports


I am missing some features in IntelliJ regarding automatically correcting things in the code. But that is easily solved with Maven or Gradle. I wrote about that here.