Resolving the File Not Found Error for JAR Files in Spring Boot on AWS EC2

Learn how to fix the `File Not Found` error while running Spring Boot applications on AWS EC2. This guide helps you to properly package your JAR and manage dependencies effectively.
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Troubleshooting the File Not Found Error in Spring Boot Applications on AWS EC2

Deploying Spring Boot applications on AWS EC2 can sometimes lead to unexpected challenges, one of which is the dreaded File Not Found error when attempting to run JAR files. If you're encountering this with messages such as:

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you are not alone. Many developers face similar issues when transitioning their applications across different environments. In this guide, we will discuss the problem and provide a detailed solution to ensure your Spring Boot application runs smoothly on AWS EC2.

Understanding the Problem

The error arises when the Java application cannot locate a required JAR file at runtime. This often happens due to:

Incorrect paths: The application expects the JAR files to be in a specific directory but they are missing or located elsewhere.

Dependency misconfiguration: JAR files might not have been bundled correctly during the building of the application.

Steps to Resolve the Issue

1. Verify JAR File Existence

Use the following command to check if the file exists:

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If the file isn't listed, you will need to re-upload it.

2. Configure Maven Properly

If the necessary JAR files are present yet you're still facing the issue, the next step is to adjust your Maven build configuration. The following adjustments help package your Spring Boot application correctly, allowing it to include all necessary dependencies.

Include the Spring Boot Maven Plugin

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3. Build the JAR Again

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This command cleans up the previous builds and packages your application afresh, ensuring that all dependencies are included properly in the JAR file.

4. Run Your Application

Once the new JAR file has been created, upload it to your EC2 instance and attempt to run it again:

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Conclusion

Deploying a Spring Boot application on AWS EC2 can be straightforward if you follow the correct steps to configure your environment and build. By ensuring that all dependencies are appropriately bundled using the Maven plugin and verifying file paths, you'll eliminate common issues like the File Not Found error.

If you run into further problems during deployment, don’t hesitate to seek help from the community or refer to official documentation. Happy coding!