[Solved] Identify the error in this custom actuator endpoint code: @Endpoint(id = "metrics") public class MetricsEndpoint { @ReadOperation public String metrics() { return 12345; } } | Spring Boot

Spring Boot - Actuator

Identify the error in this custom actuator endpoint code:

@Endpoint(id = "metrics")
public class MetricsEndpoint {
  @ReadOperation
  public String metrics() {
    return 12345;
  }
}

AThe @ReadOperation annotation is missing

BThe method name must be getMetrics

CThe @Endpoint annotation must be on a method, not class

DThe method declares String return type but returns an int

Step-by-Step Solution

Solution:

Step 1: Check method return type consistency
The method metrics() returns an integer literal 12345 but declares return type String, causing a type mismatch.
Step 2: Verify annotations and method naming
The @ReadOperation annotation is present, and @Endpoint is correctly on the class. Method name can be arbitrary.
Final Answer:
The method declares String return type but returns an int -> Option D
Quick Check:
Return type mismatch causes error [OK]

Quick Trick: Method return type must match declared type [OK]

Common Mistakes:

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