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Discover how to effectively use `RequestMapping` with parameters in Spring Boot to handle multiple GET requests without conflicts.
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This video is based on the question https://stackoverflow.com/q/72170075/ asked by the user 'Murtaza Hasan' ( https://stackoverflow.com/u/7334855/ ) and on the answer https://stackoverflow.com/a/72170329/ provided by the user '白天明' ( https://stackoverflow.com/u/15412522/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Resolving RequestMapping Parameter Conflicts in Spring Boot Controllers

When working with Spring Boot, creating REST controllers that respond to varying GET requests can be tricky, especially when it comes to managing request parameters. A common issue developers face is the misconfiguration of @ RequestMapping with the params attribute, resulting in unexpected behaviors. In this post, we’ll walk through a scenario where this issue arises and how to rectify it.

The Problem: Unexpected Method Calls

Consider a REST controller that is designed to fetch audit records. The controller has a couple of methods that are supposed to be invoked based on the presence of specific query parameters. Here’s the initial configuration of our controller:

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

Expected Behavior

If the URL /archives?pageNumber=1 is accessed, the method findRecordsForAllTenants() should be called.

Conversely, if the URL /archives?tenantId=abc&pageNumber=1 is accessed, the method findRecordsForTenant() should be invoked.

However, despite these clear separations in logic, the first method is being called for both requests.

The Cause of the Issue

Upon examining the annotations, it becomes apparent that the problem lies in how the parameters in the params attribute have been defined. In the existing code, the tenantId and pageNumber were incorrectly combined into a single string. Therefore, the framework does not understand them as separate parameters which leads to misrouting of the requests.

The Solution: Correctly Specify Request Parameters

To address this issue, we need to ensure that each parameter in the params attribute is defined separately. Here’s the corrected version of your controller methods:

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

Key Changes Made

Separate Parameters: The correction involves placing tenantId and pageNumber as separate entries in the params array, ensuring that both need to be present for the method to be correctly called.

Retain Previous Logic: The findRecordsForAllTenants() method remains unchanged but operates as intended when only pageNumber is provided in the URL.

Conclusion

Configuring request mappings in Spring Boot correctly is crucial for routing HTTP requests according to the specified parameters. By ensuring that the parameters are delineated properly in your @ RequestMapping, you can effectively control which method should be executed based on the incoming requests. By applying the fix discussed above, you will eliminate the conflict and allow for the intended functionality of your REST controller.

If you need to further troubleshoot or refine your Spring Boot applications, focus on the clarity and separation of your request mappings to facilitate easier development and maintainability. Happy coding!