Скачать или смотреть Resolving the The jar referenced by the classpath does not exist Error in STS

Encountering the error "The jar referenced by the classpath does not exist" after upgrading Spring Tool Suite? Learn how to fix it by removing invalid JAR references and managing dependencies effectively.
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This video is based on the question https://stackoverflow.com/q/65906350/ asked by the user 'Sara Noor' ( https://stackoverflow.com/u/14282408/ ) and on the answer https://stackoverflow.com/a/65933875/ provided by the user 'Martin Lippert' ( https://stackoverflow.com/u/1854124/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving the The jar referenced by the classpath does not exist Error in STS

Upgrading development tools can often lead to unexpected issues, and one common error faced by users after upgrading Spring Tool Suite (STS) is the message: "The jar referenced by the classpath does not exist." This can be particularly frustrating, especially if you're unsure of its cause or how to fix it. In this guide, we'll discuss how to resolve this specific error, allowing you to get back to coding seamlessly.

Understanding the Problem

After upgrading from STS 3.6.1 to 3.9.15, many users encounter this error message:

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

This indicates that the IDE is looking for a JAR file (in this case, axis.jar) that is no longer available after the upgrade. Users may not see a corresponding error in the project's build path configuration, further complicating the troubleshooting process.

Root Cause Analysis

The error is likely occurring because the JAR file was manually added to the classpath of your project in a previous setup, possibly created through Eclipse-specific tooling for web services. With the upgrade to a newer version of STS, that JAR file is no longer part of the default distribution.

Why You Encounter This Error:

Outdated References: The IDE is referencing a JAR from an older version that has been removed.

Manual Classpath Entries: JARs can be added directly to a project’s build path, which can lead to broken links post-upgrade.

Solution Steps

To resolve this issue, follow these steps:

1. Remove the Invalid JAR Reference

Navigate to your project in STS.

Right-click on the project and select Properties.

Go to Java Build Path and select the Libraries tab.

Look for the axis.jar reference or any other broken JAR links and remove them by selecting and clicking on the Remove button.

2. Manage Dependencies Properly

If your project still requires the functionality provided by the missing JAR, utilize a build management tool like Maven. Here’s how:

For Maven Users:

Open your pom.xml file located in the project root.

Add the following dependency (this is an example; adjust the version as needed):

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

Save the file and update the Maven project by right-clicking in the project explorer and choosing Maven Update Project.

3. Clean and Rebuild Your Project

After making changes to the build path, it’s a good practice to clean and rebuild your project:

Go to the Project menu and select Clean…

Choose your project and click OK. This will remove all compiled files and rebuild the project from scratch.

Conclusion

By following the steps outlined above, you should now be able to resolve the "The jar referenced by the classpath does not exist" error in your Spring Tool Suite. Keeping your project dependencies well-managed and ensuring no outdated references remain in your build configuration will help in maintaining a smoother development experience.

Remember that upgrading tools might require you to revisit dependencies and project configurations. If you continue to experience issues, don’t hesitate to consult forums or the official documentation for further assistance.

Happy coding!