Swagger2 in Spring boot project causes an MethodArgumentTypeMismatchException by NumberFormatException

I use the swagger2 in my srping boot project,

here is my pom.xml

   <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter</artifactId>
      <exclusions>
        <exclusion>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-logging</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-test</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-log4j2</artifactId>
    </dependency>
    <dependency>
      <groupId>io.springfox</groupId>
      <artifactId>springfox-swagger2</artifactId>
      <version>2.6.1</version>
    </dependency>
    <dependency>
      <groupId>io.springfox</groupId>
      <artifactId>springfox-swagger-ui</artifactId>
      <version>2.6.1</version>
    </dependency>

and then my restful api :

@ApiOperation(value = "create some producer", notes = "create ....")
@ApiImplicitParam(name = "num", value = "number of producer", required = true, dataType = "Long")
@RequestMapping(value = "/producer/{num}", method = RequestMethod.POST)
public String postMultiNaaSProducer(@PathVariable Long num)
{
...
}

and then I get this error as below when I try the restful api in swagger ui:

{
  "timestamp": 1489027913782,
  "status": 400,
  "error": "Bad Request",
  "exception": "org.springframework.web.method.annotation.MethodArgumentTypeMismatchException",
  "message": "Failed to convert value of type 'java.lang.String' to required type 'java.lang.Long'; nested exception is java.lang.NumberFormatException: For input string: \"{num}\"",
  "path": "/rocketmq/producer/%7Bnum%7D"
}

I don’t know why will it happened. And the api works well when I invoke by postman…

[Jack2code]

I’m sorry, I miss the paramType="path" in @ApiImplicitParam annotation。

It should be,

 @ApiImplicitParam(name = "num", value = "?????", required = true, dataType = "Long", paramType="path")

and it works well.

without paramType it consider the param num as a body param, so I only get the value of {num}。

[dilipkrish]

Awesome! thanks for reporting back!