- Plugins: Eclipse marketplace offers 1,276 plugins, and the Intellij Plugin Repository offers 727 plugins. This difference is not to be taken lightly, since plugins for new technologies will usually be developed mainly for Eclipse (e.g. Android, Drools, Activiti, etc). Moreover, Eclipse is easier to extend. When working on a specific technology most chances are that if a plugin exists, it will be an Eclipse plugin.
- Multiple projects: This is an Eclipse winner for sure. It has the ability to open multiple projects in the same window, giving the coder control over dependencies and relations. Intellij has an option to open one project with multiple modules, but we found it to be cumbersome, and in times a little buggy. If you are going to use a lot of projects together and hate to switch windows, Eclipse is your choice.
- Multiple languages: We have stated that we will only examine the Intellij Community Edition that supports Java, Groovy and Scala. However, if you plan to create a Python server, combined with Ajax & Html, joint with a java web server, or any other exotic language combinations, than Eclipse is your choice.
- Code completion & inspection: While Eclipse has the ability to add plugins such as checkstyle, this one definitely goes for Intellij. The default code completion and assistance in Intellij is faster and better. If you are a rookie developer, Intellij can improve your code.
- Usability: Intellij user experience is much easier to grasp. The learning curve in Intellij is by far faster. It seems using Intellij makes developing easier and more natural. Dropdowns, code completion, quick view, project wizards, etc, are all possible both in Eclipse and Intellij, but the experience in Intellij is much more satisfying.
- Performance: The more plugins are installed on the IDE, the more heavy it is for your computer. However, saying that, Eclipse handles very large projects faster. Moreover, both of the IDE’s seems to be RAM junkies. Projects usually open faster in Eclipse, as Intellij indexes the entire project on startup, but while working on an existing project, Intellij works smoother. For example we have a huge SOAP project, which is impossible to work on with Intellij, so some of us even learn Eclipse just for that.
- Repository integration: Both of the IDE’s have SVN\GIT\etc plugins. No doubt Intellij’s plugin is more reliable, has better GUI and easier to use.
- GUI builder: We found that the built in Intellij GUI builder is more comfortable, and as mentioned above, usability wise its easier to learn, and more enjoyable to develop.
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