Why Can't I Compile My Project with Lombok in IntelliJ IDEA 11?

How to Resolve Compilation Issues When Integrating Lombok with IntelliJ IDEA

Lombok, a popular Java library that autogenerates code, is essential for streamlining Java development. However, integrating Lombok with IntelliJ IDEA can sometimes lead to compilation problems, particularly with IntelliJ IDEA 11.

Unable to Compile Project with Lombok in IDEA

When attempting to use Lombok annotations in a project with IntelliJ IDEA 11, you may encounter errors during compilation, such as "cannot find symbol variable log." This issue arises because IntelliJ IDEA by default disables annotation processing, which is necessary for Lombok to generate the necessary code.

Solution: Enable Annotation Processing

To resolve this issue, you must enable annotation processing in IntelliJ IDEA. For IDEA versions 12 and above, you can do this by navigating to Settings > Compiler > Annotation Processors and ticking the checkbox labeled "Enable annotation processing in:" and select the desired option. For more recent versions of IDEA, follow the path Preferences... > Build, Execution, Deployment > Compiler > Annotation Processors.

Once annotation processing is enabled, perform a "Build -> Rebuild Project" to process the annotations and eliminate the compilation errors.

Additional Considerations for IDEA 2019 and Later

In IntelliJ IDEA 2019.2.1 or later, you may still experience compilation problems even after enabling annotation processing. This occurs primarily due to changes in the Java development process. To resolve this, follow these steps:

1. Visit the Project Lombok download page and download the JAR file.
2. Save the JAR file in the project's lib directory (e.g., $HOME/dev/java/project/libs).
3. In IntelliJ IDEA, navigate to Settings > Build, Execution, Deployment > Compiler > Annotation Processors.
4. Tick the "Enable annotation processing" box and adjust the "Store generated sources relative to" setting based on your project's configuration.
5. Install the "Lombok" plugin from the IntelliJ Marketplace.
6. Restart IntelliJ IDEA if prompted.
7. Add the lombok.jar file to the project's libraries as described in the "Java" and "Project Libraries" sections in the IntelliJ IDEA documentation.

By following these steps, you should be able to successfully integrate Project Lombok with IntelliJ IDEA and eliminate any compilation issues that may arise.

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