Resolving java.lang.NoSuchMethodError When Upgrading Spring Boot

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Understanding the Problem

When the upgrade occurs, the application compiles and runs properly, but all tests fail citing the NoSuchMethodError. This usually points to a version conflict between libraries, particularly between Mockito and Powermock, which are commonly used for writing unit tests in Java applications.

Key Areas to Investigate:

Mockito version: This library is used for creating mock objects in unit tests.

Powermock version: A framework that enables the testing of classes that cannot be easily mocked by Mockito.

Step-by-Step Solution

Step 1: Modify Dependency Versions

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Make sure that:

The version of Mockito specified above is set before including the Powermock dependencies.

Step 2: Clean and Rebuild Your Project

Clean your project using Maven commands:

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Rebuild your project:

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Step 3: Run Your Tests Again

After successfully rebuilding your project, run your tests again. You can use:

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Check if the NoSuchMethodError is resolved.

Additional Tips

Check for Other Dependencies: Ensure no other dependency is pulling in conflicting versions of Mockito or Powermock. You can use the Maven dependency plugin to analyze your dependencies:

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Consider Upgrading Mockito: If there are still issues, consider upgrading to a more recent version of Mockito, ensuring that it remains compatible with your versions of Powermock.

Read Documentation: Always refer to the official documentation of both libraries for compatibility notes, especially when using additional features or custom annotations.

Conclusion

If you encounter any further issues, don’t hesitate to explore community forums or reach out for expert assistance.