Скачать или смотреть Resolving the NoSuchMethodError: A Guide for Java Mail Users

Discover why you encounter the `NoSuchMethodError` while working with `jakarta.mail` and how to solve it to improve your Java email functionality.
---
This video is based on the question https://stackoverflow.com/q/73234685/ asked by the user 'du-it' ( https://stackoverflow.com/u/2756760/ ) and on the answer https://stackoverflow.com/a/73853626/ provided by the user 'Stephen C' ( https://stackoverflow.com/u/139985/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Why is 'boolean com.sun.mail.util.PropUtil.getBooleanSessionProperty(javax.mail.Session, java.lang.String, boolean)' not found?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the Problem: NoSuchMethodError in Java Mail

When working with Java mail functionalities, encountering errors can be frustrating, especially when they impede your ability to run or test your application. A common error developers face is the java.lang.NoSuchMethodError, which indicates that a method referenced in your code cannot be found in the runtime environment. This error often surfaces when there's a dependency mismatch in libraries related to Java mailing systems, particularly between javax.mail and jakarta.mail APIs.

In this post, we will delve into why you might see the error message:

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

and how you can address it effectively.

The Root Cause of the Issue

The crux of the problem you're facing seems to originate from mixing old and new versions of mail API libraries:

The old APIs (often prefixed with javax.mail) and the new jakarta.mail libraries are not compatible when certain methods are involved, leading to the NoSuchMethodError you encountered in your tests.

Common Causes

Dependency Version Conflicts: Updating jakarta.mail to version 2.0.1 while using old versions of simple-java-mail (version 6.7.x or earlier) can lead to conflicts.

Inconsistent API Usage: Mixing calls from both old and new APIs without ensuring their compatibility can result in methods that are available in one version but not in another.

Step-by-Step Solution

To resolve the compatibility issue and eliminate the NoSuchMethodError, follow these actionable steps:

1. Check Your Dependency Versions

Review the versions of the libraries you've included in your Maven pom.xml. Ensure that you are using compatible versions across all dependencies related to mail functionality.

Current Dependencies:

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

2. Upgrade simple-java-mail Version

If you have upgraded to jakarta.mail 2.0, you should also upgrade simple-java-mail to version 7.0 or later. This ensures that all the methods used are compatible and available.

3. Rollback if Necessary

If upgrading simple-java-mail is not feasible for your project for some reason, consider rolling back your mailing API to an earlier stable version of javax.mail. This, however, is a workaround and may not be suitable for all applications moving forward.

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

Conclusion

By ensuring that all dependencies align with either the old javax.mail API or the newer jakarta.mail version, you can effectively eliminate the NoSuchMethodError and enhance the functionality of your Java mail handling capabilities. Keeping dependencies up-to-date and compatible is vital for a smooth development experience, especially when working with evolving libraries like Java mail.

In summary, analyze your current dependencies, decide whether to upgrade or rollback, and choose a consistent API path to follow for your mailing needs. This approach will not only resolve your immediate issue but also set the stage for more robust email functionality in your Java applications.