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Discover effective solutions for addressing issues with `Spring Boot applications` not starting in `Jenkins`, including Maven configurations and dependency management.
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Troubleshooting a Spring Boot Application Not Starting in Jenkins

When working with a Spring Boot application in a continuous integration (CI) environment like Jenkins, it's not uncommon to run into issues that prevent your application from starting correctly. One such issue is when your Spring Boot application fails to start, even after running tests and packaging the application. In this guide, we’ll dive deep into diagnosing this problem and explore actionable solutions.

Understanding the Problem

As developers, we expect our applications to build, test, and run seamlessly as part of an automated process. However, when hosting a Spring Boot application in Jenkins, you might encounter situations where:

The build runs successfully, but the application doesn't start.

Tests are neither run nor reported.

You face build failures related to dependencies and configurations.

This can cause confusion and delay your development workflow. In this particular case, the individual faced issues related to Maven build errors, missing tests, and deployment failures.

Identifying the Issues

Upon reviewing the provided details, several issues seem evident:

No Tests Being Run: The output states that there were zero tests run, despite expecting six test cases.

Possible Configuration Issues: The absence of tests might indicate that the Maven Surefire Plugin isn't correctly configured.

Deployment Issues: The Maven deploy command returned unauthorized errors which further complicated the deployment process.

Solutions to Resolve the Issues

Let’s break down the solutions into key steps that were implemented to successfully resolve the problems.

Step 1: Maven Surefire Plugin

Problem: Tests were not being executed during the Maven build process.

Solution:
Add the Maven Surefire Plugin to your pom.xml to ensure that the tests are run effectively. Here’s what you need to add:

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

Step 2: Managing Dependencies

Problem: Incorrect or conflicting dependency settings may lead to build issues.

Solution:
After reviewing the dependencies, it was appropriate to remove the junit dependency initially added to fix deployment errors. The following is a simplified view of dependencies section from pom.xml:

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

Step 3: Update Maven Version

Problem: Encountering unauthorized errors during deployment.

Solution:
By changing the Maven version from 3.5 to 3.6.3, compatibility and performance improvements were ensured that aligned better with the project setup. This often resolves underlying bugs and issues related to plugin compatibility.

Putting It All Together

By implementing these steps, the application was successfully configured to build, test, and deploy appropriately:

Configure the Maven Surefire Plugin to execute tests.

Adjust and manage dependencies to prevent conflicts and ensure compatibility.

Upgrade the Maven version to mitigate unauthorized deployment issues.

Conclusion

Troubleshooting a Spring Boot application running in Jenkins can be challenging, but with the right approach and configurations, you can overcome these hurdles. Remember to always check your build configurations and dependencies as they are crucial for maintaining a smooth CI/CD pipeline. By following the steps outlined above, you can ensure that your application not only builds successfully but is also capable of running without issues.

If you're encountering similar issues, don't hesitate to apply these solutions and tailor them to your specific development needs.