Go to: File - Settings - Project - Checkstyle.
Click on the "Select Checkstyle Configuration..." button.
Select the Checkstyle configuration file that you want to use.
Click on the "Open" button.
You need Checkstyle 4.x, IntelliJ IDEA 4.5 (or newer) and Apache Ant 1.5 (or newer) on your system to be able to build this plugin.
Download the source code from SourceForge.
Unpack it to a folder of your choice.
Open a shell/command prompt.
Change to the directory where you unpacked the source code.
Edit the build.xml file and set the properties at the to top to values that match your system.
Run
You need Apache Maven 2.0.x on your system to be able to build this plugin.
Download the source code from SourceForge.
Unpack it to a folder of your choice.
Open a shell/command prompt.
Change to the directory where you unpacked the source code.
Run
The easy way
You can download and install the JetStyle plugin using the Plugin manager in IDEA.
Go to: File - Settings - IDE Settings - Plugins.
Select the "Available" tab.
Scroll down until you find JetStyle and then select it.
Click on the "Download and Install Plugin" button at the top of the window.
Click on the "OK" button.
The do-it-yourself way
Follow the instructions for building JetStyle in this document.
Run
JetStyle uses Checkstyle. First try to run Checkstyle separately on the commandline or using Ant.
If that works submit a bug-report to the JetStyle project. If it doesn't work then submit a bug-report to the Checkstyle project.