[Solved] You want to create a Spring Boot endpoint that handles a user ID as a path variable and optionally accepts a query parameter filter.... Which method signature correctly implements this behavior? | Spring Boot

Spring Boot - Request and Response Handling

You want to create a Spring Boot endpoint that handles a user ID as a path variable and optionally accepts a query parameter filter. If filter is missing, it should default to "all". Which method signature correctly implements this behavior?

Apublic String getUser(@PathVariable String userId, @RequestParam Optional<String> filter)

Bpublic String getUser(@RequestParam String userId, @RequestParam String filter)

Cpublic String getUser(@PathVariable String userId, @RequestParam(required = true) String filter)

Dpublic String getUser(@PathVariable String userId, @RequestParam(defaultValue = "all") String filter)

Step-by-Step Solution

Solution:

Step 1: Identify path variable usage
User ID is part of the URL path, so use @PathVariable for userId.
Step 2: Handle optional query parameter with default
Use @RequestParam with defaultValue = "all" to provide a default when filter is missing.
Final Answer:
public String getUser(@PathVariable String userId, @RequestParam(defaultValue = "all") String filter) -> Option D
Quick Check:
Default query param value = @RequestParam(defaultValue) [OK]

Quick Trick: Use @RequestParam(defaultValue) for optional query params [OK]

Common Mistakes:

Using @RequestParam(required = true) for optional params
Using @RequestParam without defaultValue causing errors
Confusing @RequestParam and @PathVariable roles

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Which method signature correctly implements this behavior?

Step 1: Identify path variable usage

Step 2: Handle optional query parameter with default

Final Answer:

Quick Check:

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