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Showing content from https://docs.pmd-code.org/latest/pmd_devdocs_building_intellij.html below:

Building PMD with IntelliJ IDEA

1. Download the Community Edition of IntelliJ IDEA from https://www.jetbrains.com/idea/download/other.html.
2. Install it, that means, extract the archive
3. Start it with bin/idea.sh
4. In the startup dialog, choose the button Open and select the folder, into which PMD’s repository has been cloned. Then select “Trust Project”. After that, IJ will automatically detect that PMD is a maven project and import it. Make sure, you have previously built PMD on command line via ./mvnw clean verify, as described in the general info page.
5. If you are using IJ for the first time, you’ll need to configure the path to your installed Java SDK. You have to use at least Java 11 here. If the dialog doesn’t show automatically, you can open it with menu File > Project Structure (CTRL+ALT+SHIFT+S). On the left, choose “Platform Settings > SDK” and add your Java SDK. Then choose “Project Settings > Project” and select the SDK for PMD.
6. Finish the wizard and wait a bit, until all PMD modules appear on the left.

• Right click on “pmd-java” and select “Run ‘All Tests’”
• You can run individual unit tests or a single unit test class by right-clicking, or CTRL + SHIFT + F10. You can debug the current Run configuration using SHIFT + F9.

• Navigate to the class PmdCli
• Run it
• Open Run > Edit Configurations… and set as program arguments eg. “check –help”
• Instead of run, you can easily choose “Debug” to run the debugger.
• Select the module “pmd-dist” for the classpath, so that all language modules are available while running PmdCli.

If you don’t have the Checkstyle plugin:

• Open File > Settings (CTRL+ALT+S) and navigate to “Plugins” on the left
• Search for “Checkstyle-IDEA” and click “Install”
• When done, restart IJ

Once you have the Checkstyle plugin:

• Open File > Settings (CTRL+ALT+S) and navigate to “Tools > Checkstyle” on the left
• Make sure to select the latest Checkstyle version and click Apply
• Add a configuration file with the “+” button on top of the table
• Choose a descriptive name e.g. “pmd checkstyle”, then tick “Use a Checkstyle file accessible via HTTP” and enter the following URL:

    https://raw.githubusercontent.com/pmd/build-tools/master/src/main/resources/net/sourceforge/pmd/pmd-checkstyle-config.xml
  

• Tick the “Active” checkbox for this added checkstyle configuration

Import the code style settings (formatter) so that it conforms with our Checkstyle config. To do that, go to File > Settings (CTLR+ALT+S) then navigate to “Editor > Code Style > Java”. Click on the cogwheel symbol, choose “Import Scheme > IntelliJ IDEA code style XML” and choose the file intellij-idea/PMD-code-style.xml from the build-tools repository.

Take some time to tweak the inspections so that they conform to the code style, for example flagging switch statements with no default case. This takes some time but can make your code much cleaner. To do that, go to File > Settings then navigate to “Inspections > Java”.

The designer lives in a separate repository, that you’ll need to fork and clone first: Designer repository

git clone git@github.com:your_user_name/pmd-designer.git

See Contributing Guide of the Designer for details.

• You’ll need to configure SDKs and select a Project SDK.
• We recommend using the provided run configurations like “Designer (Java 21)”.

• Some compilation errors: If you didn’t build PMD from command line outside of IDEA, then the sources, that are usually generated during the build, are not available. You can right-click on the PMD project and select “Maven > Generate Sources and Update Folders”. It seems, that IDEA doesn’t use the correct JDK when executing this command. Try again - it seems, it works on the second try only. After that, the folder are there, but IDEA doesn’t use them. Select “Maven > Reimport”.
• When editing FXML or CSS files for the designer, IJ sometimes fails to put the updated version in the classpath when running. You might need to run mvn process-resources manually before.
• As a quickfix for the two problems above, mvn compile is quick to execute when your Maven dependency cache is up-to-date.

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