Скачать или смотреть Resolving the No embedded container found Error in a Dockerized Micronaut Project

Learn how to effectively troubleshoot and resolve the `No embedded container found` error when dockerizing your Micronaut project with this step-by-step guide.
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Troubleshooting Dockerization of Micronaut Projects: Resolving the No embedded container found Error

If you're working on a Micronaut project in Kotlin and trying to dockerize your application, you might encounter a frustrating error: No embedded container found. Running as CLI application. This issue can cause delays in deployment and integrations, especially when it appears shortly after you attempt to run your Docker container. But don't worry; we're here to help you resolve this problem in a straightforward manner.

Understanding the Problem

When you see the message No embedded container found, it indicates that Micronaut cannot find a suitable embedded server to run your application. Generally, this happens due to missing dependencies in your build configuration, or it can also relate to the build process itself, particularly if you're using a build tool like Gradle for a Kotlin project.

Key Areas to Check:

Correct Dependencies: Ensure you have the necessary library dependencies in your Gradle file.

Build Process: Look for any misconfigurations or comments that might prevent proper operation before creating your Dockerfile.

Analyzing the Solution

In this case, the solution was straightforward once the root cause was identified. Here's a structured breakdown of how to tackle this error:

Step 1: Review Your Dependencies

One common reason for this error is not having the right server dependency in your project setup. Ensure that in your Gradle build file, the following line is included in your dependencies:

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

If it's commented out, uncomment it, save the file, and re-sync your project.

Step 2: Check Your Build Process

For Kotlin projects using Micronaut, it’s crucial that you compile your application correctly before you're able to run it within a Docker container. In this scenario, the issue stemmed from the ShadowJar operation being commented out in the Gradle build file. The ShadowJar function is essential as it packages your application, ensuring that all dependencies are included in the resulting JAR file.

Step 3: Uncomment ShadowJar

Locate the ShadowJar implementation in your Gradle build file and make sure that it is not commented out. Your build script should look something like this:

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

Uncomment this section and then run the command to build your application. This will create a JAR file that includes all necessary dependencies.

Step 4: Build and Run Your Docker Container Again

After you've resolved the build issues by running the ShadowJar operation, you need to rebuild your Docker container. Use the following command to build your Docker image:

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

Then, run your Docker container with:

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

Conclusion

By following these steps, you'll not only resolve the No embedded container found error but also have a better understanding of what it takes to dockerize a Micronaut project properly. Making sure your project is set up to include all necessary dependencies and building it correctly are key factors in this process. Now you're all set to continue your development with Micronaut in a smooth Dockerized environment!

Feel free to reach out if you're encountering any other issues along your project journey!