Installing and Using the CheckStyle Plugin in IntelliJ IDEA

Import CheckStyle Plugin

Open IntelliJ IDEA, go to File → Settings and install the CheckStyle plugin. After installation you can also download Alibaba's coding standards if needed.

Configure Plugin

After installing, configure the plugin by adding the desired checkstyle.xml file (e.g., Alibaba's rules) in the plugin settings.

Start Using CheckStyle

Select the class you want to check, right‑click and choose the CheckStyle action. If the shortcut is occupied, you can invoke the check via the context menu.

Error Causes and Solutions

1. Annotation Issues

Missing or incomplete annotations are highlighted; click the warning to jump to the problematic location and add the required annotation values.

2. Character Placeholder Issues

Adjust the code style settings to match your preferences, then apply the changes via the right‑click menu to resolve placeholder problems.

3. Meaningful Names

Rename identifiers according to the rule suggestions; screenshots illustrate the required changes.

4. Format Issues

Fix naming and formatting problems as shown; avoid large‑scale changes to public classes to minimize impact.

5. Logical Errors

Address logical mistakes highlighted by CheckStyle; the guide provides visual examples of typical errors.

6. Import Order

Incorrect import ordering triggers warnings; use the IDE shortcut (e.g., Ctrl+Shift+O in Eclipse or the equivalent in IntelliJ) or the right‑click option to reorder imports automatically.

Overall, the article emphasizes minimal code changes, careful handling of warnings, and frequent Git commits to track modifications.