Resolving the couldn't find aspectjrt.jar on classpath Error in IntelliJ

Описание: Learn how to solve the `couldn't find aspectjrt.jar on classpath` error in IntelliJ when working with a multi-module Maven project after upgrading Java. This guide provides clear steps and best practices for ensuring your AspectJ dependencies are properly configured.
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This video is based on the question https://stackoverflow.com/q/73658409/ asked by the user 'Mohit Kumar' ( https://stackoverflow.com/u/15809313/ ) and on the answer https://stackoverflow.com/a/73665605/ provided by the user 'kriegaex' ( https://stackoverflow.com/u/1082681/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Addressing the couldn't find aspectjrt.jar on classpath Issue in IntelliJ

If you're upgrading your Java project from version 8 to 11 and you encounter the error message "couldn't find aspectjrt.jar on classpath" in IntelliJ while running Maven commands, you're not alone. Many developers face this issue, especially when managing multi-module Maven projects. This guide will guide you through the reasons behind this warning and how to effectively resolve it.

Understanding the Problem

When you attempt to build your project using the mvn clean install command, you may see outputs like this:

[[See Video to Reveal this Text or Code Snippet]]

Despite having aspectjrt-1.9.7.jar in your local Maven repository (/home/.m2/repository/org/aspectj/aspectjrt/1.9.7), the issue arises due to the way dependencies are configured in your Maven pom.xml file.

The Root Cause

The key reason you're facing this issue stems from how aspectjrt is defined in your project. The AspectJ Maven Plugin requires this library as a runtime dependency, but it must be properly declared at the appropriate level in your pom.xml file.

Key Points:

aspectjrt is a runtime library essential for executing aspect-enhanced Java code.

It needs to be included as a standard compile-time dependency in the main project dependencies, not only as a plugin dependency for the AspectJ Maven Plugin.

Solution: Proper Configuration of Dependencies

To resolve the issue, you need to adjust the structure of your pom.xml. Follow these steps:

Step 1: Add aspectjrt as a Dependency

Locate your existing pom.xml file where the AspectJ plugin is defined and make sure to include the aspectjrt dependency at the top level under <dependencies>. It should look something like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Plugin Configuration

Make sure your AspectJ Maven Plugin configuration does not include aspectjrt as a nested dependency. It should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Verify the Dependency Version

Ensure that the ${aspectj.version} variable is properly defined in your properties section or directly substitute it with the actual version number (like 1.9.7).

Conclusion

By following the steps above, you should be able to resolve the "couldn't find aspectjrt.jar on classpath" error in your IntelliJ environment. Properly managing your dependencies is crucial, especially when transitioning between Java versions in Maven-based projects. With a correctly structured pom.xml, you can continue to focus on developing your applications without this distracting error.



If you have any further questions or need assistance with other Maven-related issues, feel free to reach out in the comments below!