Why does Spring Boot take so long to find method handler - spring-boot

Question

I have a service configured using Spring Boot and Swagger.
My swagger paths config look like this:
paths:
/hello/test:
post:
summary: Hello World Test
description: >-
Hello World
operationId: helloTest
tags:
- Hello
requestBody:
content:
application/json:
schema:
$ref: '#/components/schemas/HelloRequest'
description: Hello Request
required: true
responses:
'200':
description: >
OK
content:
application/json:
schema:
$ref: '#/components/schemas/HelloResponse'
'400':
$ref: '#/components/responses/BadRequest'
'401':
$ref: '#/components/responses/Unauthorized'
'403':
$ref: '#/components/responses/Forbidden'
'500':
$ref: '#/components/responses/InternalServerError'
/confirmations:
post:
summary: Hello World Confirmation
description: >-
Hello World Confirmation
operationId: postConfirmations
tags:
- Confirmation
requestBody:
content:
application/json:
schema:
$ref: '#/components/schemas/ConfirmationRequest'
description: Hello Confirmation Request
required: true
responses:
'204':
description: >
No Content
'400':
$ref: '#/components/responses/BadRequest'
'403':
$ref: '#/components/responses/Forbidden'
'500':
$ref: '#/components/responses/InternalServerError'
My logs keep showing this message several times
Did not find handler method for [/hello/test]
Even after this message is shown:
Returning handler method [public default org.springframework.http.ResponseEntity<com.sample.hello.generated.emvco.model.HelloResponse> com.sample.hello.generated.emvco.api.HelloApi.postTransactionCredentials(com.sample.hello.generated.emvco.model.HelloRequest)]
This takes up to 5 milliseconds of initial resolution which impacts the performance of the service. What causes spring to look repeatedly for one path which is clearly defined?

Answer 1

I think such a problem mainly comes when the structure of the project is not in the right way. I assume your controller class is not found or taking time during scanning cause it is in a package that will not be scanned by default. I guess your application is not in the right way or default structure. please change your controller to com.app.controller and check performance.