Resolving NoSuchMethodError in Spring Boot with MongoDB: A Simple Fix

Discover the straightforward solution to the `NoSuchMethodError` in your Spring Boot MongoDB project, ensuring your REST API functions smoothly.
---

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Resolving NoSuchMethodError in Spring Boot with MongoDB: A Simple Fix

When developing applications with Spring Boot and MongoDB, many newcomers face various challenges. One such common problem is receiving a NoSuchMethodError when trying to save an object to a MongoDB collection. This can be frustrating, especially when you have confirmed that your REST API is functioning and can receive requests without any issues.

In this post, we will explore this error in detail and provide a straightforward solution for you to implement, helping you to get back on track in your application development.

Understanding the Problem

While working on a simple REST Web Service application, many developers have encountered an error similar to this:

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

This error suggests that there is a method being called that is not found in the expected library class. In this specific case, you might have encountered this error when trying to save an Employee object to MongoDB using the EmpRepo repository.

Key Indicators of the Issue

Request reaches the API: You mentioned that the request hits the API successfully, and you can access the object being passed in the request. This confirms that your API endpoint and bindings are correctly set up.

Error occurs during save operation: The error arises specifically during the interaction with the MongoDB repository, indicating a potential mismatch in the dependencies of your project.

Analyzing the Solution

After troubleshooting this issue, the solution was found to be surprisingly straightforward. Here’s how to resolve it:

Step 1: Check Your Dependencies

You can see that there is a dependency for mongodb-driver version 3.0.1.

Alongside this, you’re using spring-boot-starter-data-mongodb version 2.4.1.

Step 2: Remove the Conflicting Dependency

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

Step 3: Refresh Dependencies and Rebuild

Step 4: Test Your Application

Once you have made these changes:

Restart your application.

Use Postman to send a POST request with the Employee object as the request body.

Check if the object saves to MongoDB without throwing any errors.

Sample Postman Request

To add an Employee object to your MongoDB database, your Postman request can look like:

Request Body:

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

Conclusion

Encountering errors during the development of REST Web Services is commonplace, especially when dealing with various dependencies. By understanding the root of the NoSuchMethodError and the steps needed to resolve it, you can ensure that your application is functioning as intended.

Removing conflicting dependencies, as shown above, is often a simple yet effective way to troubleshoot and fix these types of issues in Spring Boot applications. If you continue to face problems, check for additional dependency conflicts and ensure that you're using compatible versions.

By following thes