[Solved] Analyze the following Spring Boot controller method:@GetMapping("/invoice/{invoiceId}") public String showInvoice(@PathVariable... }What will be the response when a client accesses /invoice/7890? | Spring Boot

Spring Boot - REST Controllers

Analyze the following Spring Boot controller method:

@GetMapping("/invoice/{invoiceId}")
public String showInvoice(@PathVariable String invoiceId) {
    return "Invoice Number: " + invoiceId;
}

What will be the response when a client accesses /invoice/7890?

A"Invoice Number: null"

B"Invoice Number: {invoiceId}"

C"Invoice Number: 7890"

DHTTP 404 Not Found error

Step-by-Step Solution

Solution:

Step 1: URI Template Matching
The URL /invoice/7890 matches the pattern /invoice/{invoiceId} with invoiceId=7890.
Step 2: @PathVariable Binding
The method parameter invoiceId is bound to the string "7890".
Step 3: Return Value
The method returns "Invoice Number: " concatenated with invoiceId, resulting in "Invoice Number: 7890".
Final Answer:
"Invoice Number: 7890" -> Option C
Quick Check:
URL matches pattern and variable binds correctly [OK]

Quick Trick: Path variable value replaces placeholder in URL [OK]

Common Mistakes:

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